#Руководства
Клиент-серверная разработка — одна из самых востребованных отраслей программирования. Зная её азы, можно создавать как мессенджеры, так и онлайн-игры.
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Пишет о программировании, в свободное время создаёт игры. Мечтает открыть свою студию и выпускать ламповые RPG.
В этой серии статей мы напишем клиент-серверное приложение на C# — простейший мессенджер. Серия состоит из трёх частей:
- Вёрстка приложения — мы создадим графический интерфейс на C# и XAML для Windows.
- Создание WebAPI на ASP.NET — составим базу данных и разработаем серверную часть приложения.
- Объединение клиента и сервера — напишем запросы к серверу и позаботимся, чтобы всё работало как надо.
Язык C# пригодится в разработке чего угодно. Возможности WPF (система создания графических интерфейсов) позволяют создавать красивые и функциональные приложения для Windows, а ASP.NET — мощные серверные приложения.
Я постараюсь объяснить подробно, но охватить всё невозможно, поэтому вам нужно знать основы C#, ООП, ASP.NET, WPF и работы в Visual Studio.
Вот несколько статей, с которыми стоит ознакомиться, если вы чего-то не знаете:
Мы не рассматриваем регистрацию, поиск контактов, хранение сообщений, продвинутый дизайн. Вместо этого вы узнаете азы создания клиент-серверных приложений и сможете сделать всё самостоятельно.
Исходный код мессенджера вы найдете на GitHub.
Приложение мы поделим на экраны:
- экран авторизации;
- экран с контактами;
- экран с чатом.
Экран — это элемент Border, который по умолчанию скрыт от пользователя. Виден будет только активный экран.
На экране авторизации пользователь сможет ввести логин и пароль, чтобы войти. Если он ввёл верные данные, то перейдёт на экран с контактами, иначе — увидит сообщение об ошибке.
На экране с контактами видны имена других пользователей, с которыми ведётся переписка. Чат открывается при нажатии на имя другого пользователя.
На экране с чатом видна переписка с одним конкретным контактом. Пользователь может написать и отправить новое сообщение или вернуться к экрану с контактами.
Начнём с определения стилей. В них минимально обозначим, как должны выглядеть элементы, и сразу укажем, что экраны по умолчанию должны быть скрыты:
<Style x:Key="Screen">
<Style.Setters>
<Setter Property="Border.Visibility" Value="Hidden" />
<Setter Property="Border.Background" Value="#151515" />
</Style.Setters>
</Style>
<Style x:Key="LoginPanel">
<Style.Setters>
<Setter Property="StackPanel.Orientation" Value="Vertical" />
<Setter Property="StackPanel.VerticalAlignment" Value="Center" />
</Style.Setters>
</Style>
<Style x:Key="TextBoxBase">
<Style.Setters>
<Setter Property="TextBox.Background" Value="#333" />
<Setter Property="TextBox.Foreground" Value="#f6f6f6" />
<Setter Property="TextBox.Margin" Value="5"/>
<Setter Property="TextBox.Padding" Value="15 10"/>
<Setter Property="TextBox.HorizontalAlignment" Value="Center" />
<Setter Property="TextBox.Width" Value="250" />
</Style.Setters>
</Style>
<Style x:Key="ButtonBase" >
<Style.Setters>
<Setter Property="Button.Background" Value="#333" />
<Setter Property="Button.Foreground" Value="#f6f6f6" />
<Setter Property="Button.Margin" Value="5"/>
<Setter Property="Button.Padding" Value="50 10"/>
<Setter Property="Button.HorizontalAlignment" Value="Center" />
<Setter Property="Button.FontSize" Value="14" />
</Style.Setters>
</Style>
Теперь сверстаем сам экран авторизации — он должен быть видимым:
<Border Style="{StaticResource Screen}" Name="LoginScreen" Visibility="Visible">
<StackPanel Style="{StaticResource LoginPanel}">
<TextBlock Text="Login" Style="{StaticResource HeaderBlock}" />
<TextBox Style="{StaticResource TextBoxBase}" Name="LoginBox" />
<PasswordBox Style="{StaticResource TextBoxBase}" Name="PasswordBox"/>
<Button Content="Enter" Style="{StaticResource ButtonBase}" Name="LoginButton" Click="LoginButton_Click" IsDefault="True"/>
<TextBlock Text="" Name="LoginMessageBlock" Style="{StaticResource WarningBlock}" Visibility="Hidden"/>
</StackPanel>
</Border>
Давайте посмотрим, как это выглядит:
Теперь напишем обработчик для кнопки Enter:
//Обработчик нажатия на кнопку Login
private void LoginButton_Click(object sender, RoutedEventArgs e)
{
//Пока используем тестовые данные
if(LoginBox.Text == "admin" && PasswordBox.Password == "12345")
{
//Если логин и пароль верные, то переходим на другой экран
Open(ContactsScreen);
}
else
{
//Иначе выводим сообщение об ошибке авторизации
LoginMessageBlock.Text = "Wrong login or password!";
LoginMessageBlock.Visibility = Visibility.Visible;
}
}
//Метод для открытия другого экрана
private void Open(Border screen)
{
//Делаем все экраны невидимыми
LoginScreen.Visibility = Visibility.Hidden;
ContactsScreen.Visibility = Visibility.Hidden;
ChatScreen.Visibility = Visibility.Hidden;
//Делаем видимым необходимый экран
screen.Visibility = Visibility.Visible;
}
У вас должны быть экраны с именами ContactsScreen и ChatScreen, чтобы метод Open () работал корректно. Для этого достаточно создать два пустых элемента Border.
Вот как выглядит экран авторизации при вводе неверных данных:
Дальше сверстаем экран с контактами.
Экран с контактами разделим на два ряда с помощью Grid — заголовок в первом ряду и список контактов во втором. Список — это элемент ListBox, в котором перечислены контакты.
<Border Name="ContactsScreen" Style="{StaticResource Screen}">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="50" />
<RowDefinition />
</Grid.RowDefinitions>
<Border Grid.Row="0" Style="{StaticResource HeaderBorder}">
<TextBlock Style="{StaticResource HeaderBlock}" Text="Contacts" VerticalAlignment="Center"/>
</Border>
<Border Grid.Row="1">
<ListBox ScrollViewer.VerticalScrollBarVisibility="Auto" ScrollViewer.CanContentScroll="True"
Style="{StaticResource ContactsList}" Name="ContactsList" SelectionChanged="ContactsList_SelectionChanged">
<ListBox.ItemTemplate>
<DataTemplate>
<ListBoxItem>
<DockPanel LastChildFill="True">
<Image Style="{StaticResource ContactImage}" DockPanel.Dock="Left"></Image>
<TextBlock Text="{Binding Name}" Style="{StaticResource ContactName}" DockPanel.Dock="Right"/>
</DockPanel>
</ListBoxItem>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Border>
</Grid>
</Border>
Здесь описаны не все элементы списка, а только шаблон для них, который будет использоваться во время привязки данных. Этот шаблон понадобится в готовом приложении, но для удобства вёрстки вы можете подготовить тестовые данные.
Зададим стили:
<Style x:Key="ContactsList" BasedOn="{StaticResource TextBlockBase}">
<Style.Setters>
<Setter Property="ListBox.Background" Value="#151515"/>
<Setter Property="ListBox.BorderThickness" Value="0"/>
</Style.Setters>
</Style>
<Style x:Key="ContactImage" BasedOn="{StaticResource TextBlockBase}">
<Style.Setters>
</Style.Setters>
</Style>
<Style x:Key="ContactName" BasedOn="{StaticResource TextBlockBase}">
<Style.Setters>
<Setter Property="TextBlock.HorizontalAlignment" Value="Left"/>
</Style.Setters>
</Style>
<Style x:Key="HeaderBorder">
<Style.Setters>
<Setter Property="Border.Background" Value="#222" />
</Style.Setters>
</Style>
Теперь остаётся написать метод, который открывает чат с контактом. Этот метод вызывается, когда пользователь выберет пункт из списка.
private void ContactsList_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
//Метод вызывается, когда меняется индекс выделенного элемента
//При выделении элемент списка будет подсвечиваться
//Чтобы убрать это, мы будем менять индекс на -1
//Чтобы метод не срабатывал повторно, мы проверяем, чтобы индекс был больше или равен 0
if(ContactsList.SelectedIndex >= 0)
{
//Тут будет код загрузки сообщений из чата
//Сбрасываем индекс
ContactsList.SelectedIndex = -1;
Open(ChatScreen);
}
}
Чат похож на экран с контактами, но немного дополненный:
Grid делит экран на три части: заголовок, чат и поле ввода. В заголовке — имя собеседника и кнопка «Назад». В чате выведены сообщения с помощью ListBox, а внизу находятся поле ввода и кнопка отправки.
<Border Name="ChatScreen" Style="{StaticResource Screen}">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="50" />
<RowDefinition />
<RowDefinition Height="50"/>
</Grid.RowDefinitions>
<Border Grid.Row="0" Style="{StaticResource HeaderBorder}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*" />
<ColumnDefinition Width="6*" />
<ColumnDefinition Width="1*" />
</Grid.ColumnDefinitions>
<Button Style="{StaticResource NavButton}" Grid.Column="0" Name="BackButton" Content="←" Click="BackButton_Click"/>
<TextBlock Style="{StaticResource HeaderBlock}" Text="" VerticalAlignment="Center" Name="ChatName" Grid.Column="1"/>
</Grid>
</Border>
<Border Grid.Row="1">
<ListBox ScrollViewer.VerticalScrollBarVisibility="Auto" ScrollViewer.CanContentScroll="True"
Style="{StaticResource ContactsList}" Name="MessagesList" Focusable="False"
HorizontalAlignment="Stretch" HorizontalContentAlignment="Stretch">
<ListBox.ItemTemplate>
<DataTemplate>
<ListBoxItem>
<Border Style="{StaticResource MessageBorder}" HorizontalAlignment="{Binding Alignment}">
<StackPanel Orientation="Vertical">
<TextBlock Text="{Binding Text}" Style="{StaticResource MessageText}"/>
<TextBlock Text="{Binding Date}" Style="{StaticResource MessageDate}"/>
</StackPanel>
</Border>
</ListBoxItem>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Border>
<Border Grid.Row="2" Style="{StaticResource HeaderBorder}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="6*" />
<ColumnDefinition Width="1*" />
</Grid.ColumnDefinitions>
<TextBox Name="MessageBox" Style="{StaticResource MessageBox}" Grid.Column="0"/>
<Button Style="{StaticResource NavButton}" Grid.Column="1" Name="SendButton" Content="→" Click="SendButton_Click"/>
</Grid>
</Border>
</Grid>
</Border>
Тут, как на экране с контактами, пока нет данных -— только шаблон для их вывода. Немного стилей:
<Style x:Key="MessageBorder">
<Style.Setters>
<Setter Property="Border.Background" Value="#555" />
<Setter Property="Border.CornerRadius" Value="13" />
<Setter Property="Border.MinWidth" Value="100" />
<Setter Property="Border.MaxWidth" Value="300" />
<Setter Property="Border.Padding" Value="2" />
</Style.Setters>
</Style>
<Style x:Key="MessageText" BasedOn="{StaticResource TextBlockBase}">
<Style.Setters>
<Setter Property="TextBlock.TextWrapping" Value="Wrap" />
<Setter Property="TextBlock.Margin" Value="0" />
</Style.Setters>
</Style>
<Style x:Key="MessageDate" BasedOn="{StaticResource TextBlockBase}">
<Style.Setters>
<Setter Property="TextBlock.HorizontalAlignment" Value="Right" />
<Setter Property="TextBlock.FontSize" Value="8" />
<Setter Property="TextBlock.Margin" Value="0" />
</Style.Setters>
</Style>
Остаётся только обработать события для кнопок отправки и навигации:
private void SendButton_Click(object sender, RoutedEventArgs e)
{
string text = "";
if(!string.IsNullOrEmpty(MessageBox.Text))
{
text = MessageBox.Text.Trim();
}
if(!string.IsNullOrEmpty(text))
{
bool result = true;
if(result)
{
MessageBox.Text = "";
}
}
}
private void BackButton_Click(object sender, RoutedEventArgs e)
{
Open(ContactsScreen);
}
У нас получился довольно минималистичный дизайн, который вы можете доработать как вам нравится. Дальше нам предстоит написать серверную часть приложения, а потом связать их вместе.
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<b class="universal-notice__title">
Скидка до 55% и 3 курса в подарок
</b>
<span class="universal-timer js-universal-notice-timer js-universal-notice-active">
<span class="universal-timer__days js-universal-notice-days">2 дня</span>
<span class="js-universal-notice-hours">13</span>
:<span class="js-universal-notice-minutes">30</span>
:<span class="js-universal-notice-seconds">09</span>
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<span class="universal-notice__button">Выбрать курс</span>
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<html><body><div data-ui-id="post" data-reset-type="class" data-editor-version="3.2.4-rc1" class="stk-post stk-layout_12col_18068 stk-theme_26309" data-stk='{"images":[{"id":7618,"alt":"","caption":""},{"id":7617,"alt":"","caption":""},{"id":7619,"alt":"","caption":""}]}' data-layout-type="auto" data-ce-tag="post"><div class="stk-grid stk-theme_26309__mb_15 stk-grid__layout_reverse" data-ce-tag="grid"><div data-col-width="12" class="stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><p class="stk-reset stk-theme_26309__mb_05" data-ce-tag="paragraph">В этой серии статей мы напишем клиент-серверное приложение на C# — простейший мессенджер. Серия состоит из трёх частей:</p><ul class="stk-reset " data-ce-tag="list"><li class="stk-list-item stk-reset " data-ce-tag="list-item"><span class="stk-reset">Вёрстка приложения — мы создадим графический интерфейс на C# и XAML для Windows.</span></li><li class="stk-list-item stk-reset " data-ce-tag="list-item"><span class="stk-reset">Создание WebAPI на ASP.NET — составим базу данных и разработаем серверную часть приложения.</span></li><li class="stk-list-item stk-reset " data-ce-tag="list-item"><span class="stk-reset">Объединение клиента и сервера — напишем запросы к серверу и позаботимся, чтобы всё работало как надо.</span></li></ul><p class="stk-reset " data-ce-tag="paragraph">Язык C# пригодится в разработке чего угодно. Возможности WPF <em class="stk-reset">(система создания графических интерфейсов) </em>позволяют создавать красивые и функциональные приложения для Windows, а ASP.NET — мощные серверные приложения.</p><p class="stk-reset " data-ce-tag="paragraph">Я постараюсь объяснить подробно, но охватить всё невозможно, поэтому вам нужно знать основы C#, ООП, ASP.NET, WPF и работы в Visual Studio.</p><p class="stk-reset stk-theme_26309__mb_05" data-ce-tag="paragraph">Вот несколько статей, с которыми стоит ознакомиться, если вы чего-то не знаете:</p><ul class="stk-reset stk-theme_26309__pad_hor_1" data-ce-tag="list"><li class="stk-list-item stk-reset " data-ce-tag="list-item"><span class="stk-reset"><a class="stk-reset" href="https://skillbox.ru/media/code/oop_chast_1_chto_takoe_klassy_i_obekty/" target="_blank">ООП в C#</a> <span class="stk-reset"><em class="stk-reset">(серия статей).</em></span></span></li><li class="stk-list-item stk-reset " data-ce-tag="list-item"><span class="stk-reset"><a href="https://skillbox.ru/media/code/kak_za_chas_sozdat_sayt_na_asp_net/" target="_blank" class="stk-reset">Как за час создать сайт на ASP.NET</a>.</span></li><li class="stk-list-item stk-reset " data-ce-tag="list-item"><span class="stk-reset"><a href="https://skillbox.ru/media/code/mvvm_proektirovanie_prilozheniy_dlya_windows/" target="_blank" class="stk-reset">Что такое MVVM: проектирование приложений для Windows</a>.</span></li><li class="stk-list-item stk-reset " data-ce-tag="list-item"><span class="stk-reset"><a class="stk-reset" href="https://skillbox.ru/media/code/asinkhronnoe_programmirovanie_chast_1_kak_rabotaet_protsessor/" target="_blank">Асинхронное программирование: Как работает процессор</a> <em class="stk-reset">(серия статей).</em></span></li></ul></div></div><div class="stk-grid stk-theme_26309__mb_15" data-ce-tag="grid"><div data-col-width="12" class="stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><h2 class="stk-reset stk-theme_26309__style_large_header stk-theme_26309__mb_05" data-ce-tag="paragraph">Структура приложения</h2><p class="stk-reset " data-ce-tag="paragraph">Мы не<strong class="stk-reset"> </strong>рассматриваем регистрацию, поиск контактов, хранение сообщений, продвинутый дизайн. Вместо этого вы узнаете азы создания клиент-серверных приложений и сможете сделать всё самостоятельно.</p><p class="stk-reset " data-ce-tag="paragraph">Исходный код мессенджера вы найдете на <a href="https://github.com/evgeniikucheriavii/Sharp-Messenger" target="_blank" class="stk-reset">GitHub</a>.</p><p class="stk-reset stk-theme_26309__mb_05" data-ce-tag="paragraph">Приложение мы поделим на экраны:</p><ul class="stk-reset stk-theme_26309__pad_hor_1" data-ce-tag="list"><li class="stk-list-item stk-reset " data-ce-tag="list-item"><span class="stk-reset">экран авторизации;</span></li><li class="stk-list-item stk-reset " data-ce-tag="list-item"><span class="stk-reset">экран с контактами;</span></li><li class="stk-list-item stk-reset " data-ce-tag="list-item"><span class="stk-reset">экран с чатом.</span></li></ul><p class="stk-reset " data-ce-tag="paragraph"><strong class="stk-reset">Экран</strong> — это элемент <em class="stk-reset">Border</em>, который по умолчанию скрыт от пользователя. Виден будет только активный экран.</p><p class="stk-reset " data-ce-tag="paragraph">На <strong class="stk-reset">экране авторизации</strong> пользователь сможет ввести логин и пароль, чтобы войти. Если он ввёл верные данные, то перейдёт на экран с контактами, иначе — увидит сообщение об ошибке.</p><p class="stk-reset " data-ce-tag="paragraph">На <strong class="stk-reset">экране с контактами</strong> видны имена других пользователей, с которыми ведётся переписка. Чат открывается при нажатии на имя другого пользователя.</p><p class="stk-reset " data-ce-tag="paragraph">На <strong class="stk-reset">экране с чатом</strong> видна переписка с одним конкретным контактом. Пользователь может написать и отправить новое сообщение или вернуться к экрану с контактами.</p></div></div><div class="stk-grid stk-theme_26309__mb_15" data-ce-tag="grid"><div data-col-width="12" class="stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><h2 class="stk-reset stk-theme_26309__style_large_header stk-theme_26309__mb_05" data-ce-tag="paragraph">Верстаем экран авторизации</h2><p class="stk-reset " data-ce-tag="paragraph">Начнём с определения стилей. В них минимально обозначим, как должны выглядеть элементы, и сразу укажем, что экраны по умолчанию должны быть скрыты:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
</div><figure class="stk-reset stk-embed-figure stk-embed_rendered" data-ce-tag="embed"><code class="stk-reset stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: #000000; color: #f8f8f8;"><<span class="hljs-keyword" style="color: #96cbfe;">Style</span> x:Key=<span class="hljs-string" style="color: #a8ff60;">"Screen"</span>>
<<span class="hljs-keyword" style="color: #96cbfe;">Style</span>.Setters>
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"Border.Visibility"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"Hidden"</span> />
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"Border.Background"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"#151515"</span> />
</<span class="hljs-keyword" style="color: #96cbfe;">Style</span>.Setters>
</<span class="hljs-keyword" style="color: #96cbfe;">Style</span>>
<<span class="hljs-keyword" style="color: #96cbfe;">Style</span> x:Key=<span class="hljs-string" style="color: #a8ff60;">"LoginPanel"</span>>
<<span class="hljs-keyword" style="color: #96cbfe;">Style</span>.Setters>
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"StackPanel.Orientation"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"Vertical"</span> />
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"StackPanel.VerticalAlignment"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"Center"</span> />
</<span class="hljs-keyword" style="color: #96cbfe;">Style</span>.Setters>
</<span class="hljs-keyword" style="color: #96cbfe;">Style</span>>
<<span class="hljs-keyword" style="color: #96cbfe;">Style</span> x:Key=<span class="hljs-string" style="color: #a8ff60;">"TextBoxBase"</span>>
<<span class="hljs-keyword" style="color: #96cbfe;">Style</span>.Setters>
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"TextBox.Background"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"#333"</span> />
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"TextBox.Foreground"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"#f6f6f6"</span> />
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"TextBox.Margin"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"5"</span>/>
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"TextBox.Padding"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"15 10"</span>/>
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"TextBox.HorizontalAlignment"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"Center"</span> />
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"TextBox.Width"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"250"</span> />
</<span class="hljs-keyword" style="color: #96cbfe;">Style</span>.Setters>
</<span class="hljs-keyword" style="color: #96cbfe;">Style</span>>
<<span class="hljs-keyword" style="color: #96cbfe;">Style</span> x:Key=<span class="hljs-string" style="color: #a8ff60;">"ButtonBase"</span> >
<<span class="hljs-keyword" style="color: #96cbfe;">Style</span>.Setters>
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"Button.Background"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"#333"</span> />
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"Button.Foreground"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"#f6f6f6"</span> />
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"Button.Margin"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"5"</span>/>
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"Button.Padding"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"50 10"</span>/>
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"Button.HorizontalAlignment"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"Center"</span> />
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"Button.FontSize"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"14"</span> />
</<span class="hljs-keyword" style="color: #96cbfe;">Style</span>.Setters>
</<span class="hljs-keyword" style="color: #96cbfe;">Style</span>>
</pre></code></figure></div><p class="stk-reset" data-ce-tag="paragraph">Теперь сверстаем сам экран авторизации — он должен быть видимым:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
</div><figure class="stk-reset stk-embed-figure stk-embed_rendered" data-ce-tag="embed"><code class="stk-reset stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: #000000; color: #f8f8f8;"><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Border</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource Screen}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span> <span class="hljs-attr">Name</span>=<span class="hljs-string" style="color: #a8ff60;">"LoginScreen"</span> <span class="hljs-attr">Visibility</span>=<span class="hljs-string" style="color: #a8ff60;">"Visible"</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">StackPanel</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource LoginPanel}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">TextBlock</span> <span class="hljs-attr">Text</span>=<span class="hljs-string" style="color: #a8ff60;">"Login"</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource HeaderBlock}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span> /></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">TextBox</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource TextBoxBase}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span> <span class="hljs-attr">Name</span>=<span class="hljs-string" style="color: #a8ff60;">"LoginBox"</span> /></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">PasswordBox</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource TextBoxBase}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span> <span class="hljs-attr">Name</span>=<span class="hljs-string" style="color: #a8ff60;">"PasswordBox"</span>/></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Button</span> <span class="hljs-attr">Content</span>=<span class="hljs-string" style="color: #a8ff60;">"Enter"</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource ButtonBase}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span> <span class="hljs-attr">Name</span>=<span class="hljs-string" style="color: #a8ff60;">"LoginButton"</span> <span class="hljs-attr">Click</span>=<span class="hljs-string" style="color: #a8ff60;">"LoginButton_Click"</span> <span class="hljs-attr">IsDefault</span>=<span class="hljs-string" style="color: #a8ff60;">"True"</span>/></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">TextBlock</span> <span class="hljs-attr">Text</span>=<span class="hljs-string" style="color: #a8ff60;">""</span> <span class="hljs-attr">Name</span>=<span class="hljs-string" style="color: #a8ff60;">"LoginMessageBlock"</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource WarningBlock}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span> <span class="hljs-attr">Visibility</span>=<span class="hljs-string" style="color: #a8ff60;">"Hidden"</span>/></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">StackPanel</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Border</span>></span>
</span></pre></code></figure></div><p class="stk-reset" data-ce-tag="paragraph">Давайте посмотрим, как это выглядит:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
</div><figure class="stk-reset stk-image-figure" data-ce-tag="image-figure"><div data-ce-tag="mask" class="stk-mask"><a><picture >
<source srcset="https://248006.selcdn.ru/main/upload/setka_images/17384023062020_27e9aa5bdf801f94f7728fe14d1ac08405e5a691.png.webp" data-image-id='7619' data-image-name='image1.png' class='stk-image stk-reset' loading='lazy' type='image/webp' />
<img src="https://248006.selcdn.ru/main/upload/setka_images/17384023062020_27e9aa5bdf801f94f7728fe14d1ac08405e5a691.png" data-image-id='7619' data-image-name='image1.png' class='stk-image stk-reset' loading='lazy' />
</picture></a></div></figure></div><p class="stk-reset" data-ce-tag="paragraph">Теперь напишем обработчик для кнопки <em class="stk-reset">Enter</em>:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
</div><figure class="stk-reset stk-embed-figure stk-embed_rendered" data-ce-tag="embed"><code class="stk-reset stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: #000000; color: #f8f8f8;"><span class="hljs-comment" style="color: #7c7c7c;">//Обработчик нажатия на кнопку Login</span>
<span class="hljs-function"><span class="hljs-keyword" style="color: #96cbfe;">private</span> <span class="hljs-keyword" style="color: #96cbfe;">void</span> <span class="hljs-title" style="color: #ffffb6;">LoginButton_Click</span>(<span class="hljs-params"><span class="hljs-keyword" style="color: #96cbfe;">object</span> sender, RoutedEventArgs e</span>)
</span>{
<span class="hljs-comment" style="color: #7c7c7c;">//Пока используем тестовые данные</span>
<span class="hljs-keyword" style="color: #96cbfe;">if</span>(LoginBox.Text == <span class="hljs-string" style="color: #a8ff60;">"admin"</span> && PasswordBox.Password == <span class="hljs-string" style="color: #a8ff60;">"12345"</span>)
{
<span class="hljs-comment" style="color: #7c7c7c;">//Если логин и пароль верные, то переходим на другой экран</span>
Open(ContactsScreen);
}
<span class="hljs-keyword" style="color: #96cbfe;">else</span>
{
<span class="hljs-comment" style="color: #7c7c7c;">//Иначе выводим сообщение об ошибке авторизации</span>
LoginMessageBlock.Text = <span class="hljs-string" style="color: #a8ff60;">"Wrong login or password!"</span>;
LoginMessageBlock.Visibility = Visibility.Visible;
}
}
<span class="hljs-comment" style="color: #7c7c7c;">//Метод для открытия другого экрана</span>
<span class="hljs-function"><span class="hljs-keyword" style="color: #96cbfe;">private</span> <span class="hljs-keyword" style="color: #96cbfe;">void</span> <span class="hljs-title" style="color: #ffffb6;">Open</span>(<span class="hljs-params">Border screen</span>)
</span>{
<span class="hljs-comment" style="color: #7c7c7c;">//Делаем все экраны невидимыми</span>
LoginScreen.Visibility = Visibility.Hidden;
ContactsScreen.Visibility = Visibility.Hidden;
ChatScreen.Visibility = Visibility.Hidden;
<span class="hljs-comment" style="color: #7c7c7c;">//Делаем видимым необходимый экран</span>
screen.Visibility = Visibility.Visible;
}
</pre></code></figure></div><p class="stk-reset" data-ce-tag="paragraph">У вас должны быть экраны с именами <em class="stk-reset">ContactsScreen</em> и <em class="stk-reset">ChatScreen</em>, чтобы метод <em class="stk-reset">Open ()</em> работал корректно. Для этого достаточно создать два пустых элемента <em class="stk-reset">Border</em>.</p><p class="stk-reset " data-ce-tag="paragraph">Вот как выглядит экран авторизации при вводе неверных данных:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
</div><figure class="stk-reset stk-image-figure" data-ce-tag="image-figure"><div data-ce-tag="mask" class="stk-mask"><a><picture >
<source srcset="https://248006.selcdn.ru/main/upload/setka_images/17384023062020_db52642fc67f6c7c46657360f234a883af322464.png.webp" data-image-id='7618' data-image-name='image3.png' class='stk-image stk-reset' loading='lazy' type='image/webp' />
<img src="https://248006.selcdn.ru/main/upload/setka_images/17384023062020_db52642fc67f6c7c46657360f234a883af322464.png" data-image-id='7618' data-image-name='image3.png' class='stk-image stk-reset' loading='lazy' />
</picture></a></div></figure></div><p class="stk-reset " data-ce-tag="paragraph">Дальше сверстаем экран с контактами.</p></div></div><div class="stk-grid stk-theme_26309__mb_15" data-ce-tag="grid"><div data-col-width="12" class="stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><h2 class="stk-reset stk-theme_26309__style_large_header stk-theme_26309__mb_05" data-ce-tag="paragraph">Верстаем экран с контактами</h2><p class="stk-reset " data-ce-tag="paragraph">Экран с контактами разделим на два ряда с помощью Grid — заголовок в первом ряду и список контактов во втором. Список — это элемент <em class="stk-reset">ListBox</em>, в котором перечислены контакты.</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
</div><figure class="stk-reset stk-embed-figure stk-embed_rendered" data-ce-tag="embed"><code class="stk-reset stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: #000000; color: #f8f8f8;"><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Border</span> <span class="hljs-attr">Name</span>=<span class="hljs-string" style="color: #a8ff60;">"ContactsScreen"</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource Screen}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Grid</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Grid.RowDefinitions</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">RowDefinition</span> <span class="hljs-attr">Height</span>=<span class="hljs-string" style="color: #a8ff60;">"50"</span> /></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">RowDefinition</span> /></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Grid.RowDefinitions</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Border</span> <span class="hljs-attr">Grid.Row</span>=<span class="hljs-string" style="color: #a8ff60;">"0"</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource HeaderBorder}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">TextBlock</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource HeaderBlock}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span> <span class="hljs-attr">Text</span>=<span class="hljs-string" style="color: #a8ff60;">"Contacts"</span> <span class="hljs-attr">VerticalAlignment</span>=<span class="hljs-string" style="color: #a8ff60;">"Center"</span>/></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Border</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Border</span> <span class="hljs-attr">Grid.Row</span>=<span class="hljs-string" style="color: #a8ff60;">"1"</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">ListBox</span> <span class="hljs-attr">ScrollViewer.VerticalScrollBarVisibility</span>=<span class="hljs-string" style="color: #a8ff60;">"Auto"</span> <span class="hljs-attr">ScrollViewer.CanContentScroll</span>=<span class="hljs-string" style="color: #a8ff60;">"True"</span>
<span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource ContactsList}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span> <span class="hljs-attr">Name</span>=<span class="hljs-string" style="color: #a8ff60;">"ContactsList"</span> <span class="hljs-attr">SelectionChanged</span>=<span class="hljs-string" style="color: #a8ff60;">"ContactsList_SelectionChanged"</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">ListBox.ItemTemplate</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">DataTemplate</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">ListBoxItem</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">DockPanel</span> <span class="hljs-attr">LastChildFill</span>=<span class="hljs-string" style="color: #a8ff60;">"True"</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Image</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource ContactImage}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span> <span class="hljs-attr">DockPanel.Dock</span>=<span class="hljs-string" style="color: #a8ff60;">"Left"</span>></span><span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Image</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">TextBlock</span> <span class="hljs-attr">Text</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{Binding Name}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource ContactName}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span> <span class="hljs-attr">DockPanel.Dock</span>=<span class="hljs-string" style="color: #a8ff60;">"Right"</span>/></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">DockPanel</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">ListBoxItem</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">DataTemplate</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">ListBox.ItemTemplate</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">ListBox</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Border</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Grid</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Border</span>></span>
</span></pre></code></figure></div><p class="stk-reset" data-ce-tag="paragraph">Здесь описаны не все элементы списка, а только шаблон для них, который будет использоваться во время привязки данных. Этот шаблон понадобится в готовом приложении, но для удобства вёрстки вы можете подготовить тестовые данные.</p><p class="stk-reset " data-ce-tag="paragraph">Зададим стили:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
</div><figure class="stk-reset stk-embed-figure stk-embed_rendered" data-ce-tag="embed"><code class="stk-reset stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: #000000; color: #f8f8f8;"><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Style</span> <span class="hljs-attr">x:Key</span>=<span class="hljs-string" style="color: #a8ff60;">"ContactsList"</span> <span class="hljs-attr">BasedOn</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource TextBlockBase}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span>></span><span class="xml">
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Style.Setters</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Setter</span> <span class="hljs-attr">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"ListBox.Background"</span> <span class="hljs-attr">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"#151515"</span>/></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Setter</span> <span class="hljs-attr">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"ListBox.BorderThickness"</span> <span class="hljs-attr">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"0"</span>/></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Style.Setters</span>></span>
</span><span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Style</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Style</span> <span class="hljs-attr">x:Key</span>=<span class="hljs-string" style="color: #a8ff60;">"ContactImage"</span> <span class="hljs-attr">BasedOn</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource TextBlockBase}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span>></span><span class="xml">
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Style.Setters</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Style.Setters</span>></span>
</span><span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Style</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Style</span> <span class="hljs-attr">x:Key</span>=<span class="hljs-string" style="color: #a8ff60;">"ContactName"</span> <span class="hljs-attr">BasedOn</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource TextBlockBase}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span>></span><span class="xml">
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Style.Setters</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Setter</span> <span class="hljs-attr">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"TextBlock.HorizontalAlignment"</span> <span class="hljs-attr">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"Left"</span>/></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Style.Setters</span>></span>
</span><span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Style</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Style</span> <span class="hljs-attr">x:Key</span>=<span class="hljs-string" style="color: #a8ff60;">"HeaderBorder"</span>></span><span class="xml">
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Style.Setters</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Setter</span> <span class="hljs-attr">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"Border.Background"</span> <span class="hljs-attr">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"#222"</span> /></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Style.Setters</span>></span>
</span><span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Style</span>></span>
</span></pre></code></figure></div><p class="stk-reset" data-ce-tag="paragraph">Теперь остаётся написать метод, который открывает чат с контактом. Этот метод вызывается, когда пользователь выберет пункт из списка.</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
</div><figure class="stk-reset stk-embed-figure stk-embed_rendered" data-ce-tag="embed"><code class="stk-reset stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: #000000; color: #f8f8f8;"><span class="hljs-function"><span class="hljs-keyword" style="color: #96cbfe;">private</span> <span class="hljs-keyword" style="color: #96cbfe;">void</span> <span class="hljs-title" style="color: #ffffb6;">ContactsList_SelectionChanged</span>(<span class="hljs-params"><span class="hljs-keyword" style="color: #96cbfe;">object</span> sender, SelectionChangedEventArgs e</span>)
</span>{
<span class="hljs-comment" style="color: #7c7c7c;">//Метод вызывается, когда меняется индекс выделенного элемента</span>
<span class="hljs-comment" style="color: #7c7c7c;">//При выделении элемент списка будет подсвечиваться</span>
<span class="hljs-comment" style="color: #7c7c7c;">//Чтобы убрать это, мы будем менять индекс на -1</span>
<span class="hljs-comment" style="color: #7c7c7c;">//Чтобы метод не срабатывал повторно, мы проверяем, чтобы индекс был больше или равен 0</span>
<span class="hljs-keyword" style="color: #96cbfe;">if</span>(ContactsList.SelectedIndex >= <span class="hljs-number" style="color: #ff73fd;">0</span>)
{
<span class="hljs-comment" style="color: #7c7c7c;">//Тут будет код загрузки сообщений из чата</span>
<span class="hljs-comment" style="color: #7c7c7c;">//Сбрасываем индекс</span>
ContactsList.SelectedIndex = <span class="hljs-number" style="color: #ff73fd;">-1</span>;
Open(ChatScreen);
}
}
</pre></code></figure></div></div></div><div class="stk-grid stk-theme_26309__mb_15" data-ce-tag="grid"><div data-col-width="12" class="stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><h2 class="stk-reset stk-theme_26309__style_large_header stk-theme_26309__mb_05" data-ce-tag="paragraph">Верстаем экран с чатом</h2><p class="stk-reset " data-ce-tag="paragraph">Чат похож на экран с контактами, но немного дополненный:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
</div><figure class="stk-reset stk-image-figure" data-ce-tag="image-figure"><div data-ce-tag="mask" class="stk-mask"><a><picture >
<source srcset="https://248006.selcdn.ru/main/upload/setka_images/17384023062020_e3ea06ecc4efe66fd609360c227a5daace25eda6.png.webp" data-image-id='7617' data-image-name='image2.png' class='stk-image stk-reset' loading='lazy' type='image/webp' />
<img src="https://248006.selcdn.ru/main/upload/setka_images/17384023062020_e3ea06ecc4efe66fd609360c227a5daace25eda6.png" data-image-id='7617' data-image-name='image2.png' class='stk-image stk-reset' loading='lazy' />
</picture></a></div></figure></div><p class="stk-reset " data-ce-tag="paragraph"><em class="stk-reset">Grid</em> делит экран на три части: заголовок, чат и поле ввода. В заголовке — имя собеседника и кнопка «Назад». В чате выведены сообщения с помощью <em class="stk-reset">ListBox</em>, а внизу находятся поле ввода и кнопка отправки.</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
</div><figure class="stk-reset stk-embed-figure stk-embed_rendered" data-ce-tag="embed"><code class="stk-reset stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: #000000; color: #f8f8f8;"><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Border</span> <span class="hljs-attr">Name</span>=<span class="hljs-string" style="color: #a8ff60;">"ChatScreen"</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource Screen}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Grid</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Grid.RowDefinitions</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">RowDefinition</span> <span class="hljs-attr">Height</span>=<span class="hljs-string" style="color: #a8ff60;">"50"</span> /></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">RowDefinition</span> /></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">RowDefinition</span> <span class="hljs-attr">Height</span>=<span class="hljs-string" style="color: #a8ff60;">"50"</span>/></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Grid.RowDefinitions</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Border</span> <span class="hljs-attr">Grid.Row</span>=<span class="hljs-string" style="color: #a8ff60;">"0"</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource HeaderBorder}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Grid</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Grid.ColumnDefinitions</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">ColumnDefinition</span> <span class="hljs-attr">Width</span>=<span class="hljs-string" style="color: #a8ff60;">"1*"</span> /></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">ColumnDefinition</span> <span class="hljs-attr">Width</span>=<span class="hljs-string" style="color: #a8ff60;">"6*"</span> /></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">ColumnDefinition</span> <span class="hljs-attr">Width</span>=<span class="hljs-string" style="color: #a8ff60;">"1*"</span> /></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Grid.ColumnDefinitions</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Button</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource NavButton}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span> <span class="hljs-attr">Grid.Column</span>=<span class="hljs-string" style="color: #a8ff60;">"0"</span> <span class="hljs-attr">Name</span>=<span class="hljs-string" style="color: #a8ff60;">"BackButton"</span> <span class="hljs-attr">Content</span>=<span class="hljs-string" style="color: #a8ff60;">"←"</span> <span class="hljs-attr">Click</span>=<span class="hljs-string" style="color: #a8ff60;">"BackButton_Click"</span>/></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">TextBlock</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource HeaderBlock}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span> <span class="hljs-attr">Text</span>=<span class="hljs-string" style="color: #a8ff60;">""</span> <span class="hljs-attr">VerticalAlignment</span>=<span class="hljs-string" style="color: #a8ff60;">"Center"</span> <span class="hljs-attr">Name</span>=<span class="hljs-string" style="color: #a8ff60;">"ChatName"</span> <span class="hljs-attr">Grid.Column</span>=<span class="hljs-string" style="color: #a8ff60;">"1"</span>/></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Grid</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Border</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Border</span> <span class="hljs-attr">Grid.Row</span>=<span class="hljs-string" style="color: #a8ff60;">"1"</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">ListBox</span> <span class="hljs-attr">ScrollViewer.VerticalScrollBarVisibility</span>=<span class="hljs-string" style="color: #a8ff60;">"Auto"</span> <span class="hljs-attr">ScrollViewer.CanContentScroll</span>=<span class="hljs-string" style="color: #a8ff60;">"True"</span>
<span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource ContactsList}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span> <span class="hljs-attr">Name</span>=<span class="hljs-string" style="color: #a8ff60;">"MessagesList"</span> <span class="hljs-attr">Focusable</span>=<span class="hljs-string" style="color: #a8ff60;">"False"</span>
<span class="hljs-attr">HorizontalAlignment</span>=<span class="hljs-string" style="color: #a8ff60;">"Stretch"</span> <span class="hljs-attr">HorizontalContentAlignment</span>=<span class="hljs-string" style="color: #a8ff60;">"Stretch"</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">ListBox.ItemTemplate</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">DataTemplate</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">ListBoxItem</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Border</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource MessageBorder}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span> <span class="hljs-attr">HorizontalAlignment</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{Binding Alignment}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">StackPanel</span> <span class="hljs-attr">Orientation</span>=<span class="hljs-string" style="color: #a8ff60;">"Vertical"</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">TextBlock</span> <span class="hljs-attr">Text</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{Binding Text}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource MessageText}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span>/></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">TextBlock</span> <span class="hljs-attr">Text</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{Binding Date}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource MessageDate}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span>/></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">StackPanel</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Border</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">ListBoxItem</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">DataTemplate</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">ListBox.ItemTemplate</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">ListBox</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Border</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Border</span> <span class="hljs-attr">Grid.Row</span>=<span class="hljs-string" style="color: #a8ff60;">"2"</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource HeaderBorder}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Grid</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Grid.ColumnDefinitions</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">ColumnDefinition</span> <span class="hljs-attr">Width</span>=<span class="hljs-string" style="color: #a8ff60;">"6*"</span> /></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">ColumnDefinition</span> <span class="hljs-attr">Width</span>=<span class="hljs-string" style="color: #a8ff60;">"1*"</span> /></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Grid.ColumnDefinitions</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">TextBox</span> <span class="hljs-attr">Name</span>=<span class="hljs-string" style="color: #a8ff60;">"MessageBox"</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource MessageBox}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span> <span class="hljs-attr">Grid.Column</span>=<span class="hljs-string" style="color: #a8ff60;">"0"</span>/></span>
<span class="hljs-tag" style="color: #96cbfe;"><<span class="hljs-name" style="color: #96cbfe;">Button</span> <span class="hljs-attr">Style</span>=<span class="hljs-string" style="color: #a8ff60;">"</span></span></span><span class="hljs-template-variable" style="color: #c6c5fe;">{StaticResource NavButton}</span><span class="xml"><span class="hljs-tag" style="color: #96cbfe;"><span class="hljs-string" style="color: #a8ff60;">"</span> <span class="hljs-attr">Grid.Column</span>=<span class="hljs-string" style="color: #a8ff60;">"1"</span> <span class="hljs-attr">Name</span>=<span class="hljs-string" style="color: #a8ff60;">"SendButton"</span> <span class="hljs-attr">Content</span>=<span class="hljs-string" style="color: #a8ff60;">"→"</span> <span class="hljs-attr">Click</span>=<span class="hljs-string" style="color: #a8ff60;">"SendButton_Click"</span>/></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Grid</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Border</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Grid</span>></span>
<span class="hljs-tag" style="color: #96cbfe;"></<span class="hljs-name" style="color: #96cbfe;">Border</span>></span>
</span></pre></code></figure></div><p class="stk-reset" data-ce-tag="paragraph">Тут, как на экране с контактами, пока нет данных -— только шаблон для их вывода. Немного стилей:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
</div><figure class="stk-reset stk-embed-figure stk-embed_rendered" data-ce-tag="embed"><code class="stk-reset stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: #000000; color: #f8f8f8;"><<span class="hljs-keyword" style="color: #96cbfe;">Style</span> x:Key=<span class="hljs-string" style="color: #a8ff60;">"MessageBorder"</span>>
<<span class="hljs-keyword" style="color: #96cbfe;">Style</span>.Setters>
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"Border.Background"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"#555"</span> />
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"Border.CornerRadius"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"13"</span> />
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"Border.MinWidth"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"100"</span> />
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"Border.MaxWidth"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"300"</span> />
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"Border.Padding"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"2"</span> />
</<span class="hljs-keyword" style="color: #96cbfe;">Style</span>.Setters>
</<span class="hljs-keyword" style="color: #96cbfe;">Style</span>>
<<span class="hljs-keyword" style="color: #96cbfe;">Style</span> x:Key=<span class="hljs-string" style="color: #a8ff60;">"MessageText"</span> BasedOn=<span class="hljs-string" style="color: #a8ff60;">"{StaticResource TextBlockBase}"</span>>
<<span class="hljs-keyword" style="color: #96cbfe;">Style</span>.Setters>
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"TextBlock.TextWrapping"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"Wrap"</span> />
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"TextBlock.Margin"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"0"</span> />
</<span class="hljs-keyword" style="color: #96cbfe;">Style</span>.Setters>
</<span class="hljs-keyword" style="color: #96cbfe;">Style</span>>
<<span class="hljs-keyword" style="color: #96cbfe;">Style</span> x:Key=<span class="hljs-string" style="color: #a8ff60;">"MessageDate"</span> BasedOn=<span class="hljs-string" style="color: #a8ff60;">"{StaticResource TextBlockBase}"</span>>
<<span class="hljs-keyword" style="color: #96cbfe;">Style</span>.Setters>
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"TextBlock.HorizontalAlignment"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"Right"</span> />
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"TextBlock.FontSize"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"8"</span> />
<<span class="hljs-keyword" style="color: #96cbfe;">Setter</span> <span class="hljs-keyword" style="color: #96cbfe;">Property</span>=<span class="hljs-string" style="color: #a8ff60;">"TextBlock.Margin"</span> <span class="hljs-keyword" style="color: #96cbfe;">Value</span>=<span class="hljs-string" style="color: #a8ff60;">"0"</span> />
</<span class="hljs-keyword" style="color: #96cbfe;">Style</span>.Setters>
</<span class="hljs-keyword" style="color: #96cbfe;">Style</span>>
</pre></code></figure></div><p class="stk-reset" data-ce-tag="paragraph">Остаётся только обработать события для кнопок отправки и навигации:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
<div class="sklbx-browser__button"></div>
</div><figure class="stk-reset stk-embed-figure stk-embed_rendered" data-ce-tag="embed"><code class="stk-reset stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: #000000; color: #f8f8f8;"><span class="hljs-function"><span class="hljs-keyword" style="color: #96cbfe;">private</span> <span class="hljs-keyword" style="color: #96cbfe;">void</span> <span class="hljs-title" style="color: #ffffb6;">SendButton_Click</span>(<span class="hljs-params"><span class="hljs-keyword" style="color: #96cbfe;">object</span> sender, RoutedEventArgs e</span>)
</span>{
<span class="hljs-keyword" style="color: #96cbfe;">string</span> text = <span class="hljs-string" style="color: #a8ff60;">""</span>;
<span class="hljs-keyword" style="color: #96cbfe;">if</span>(!<span class="hljs-keyword" style="color: #96cbfe;">string</span>.IsNullOrEmpty(MessageBox.Text))
{
text = MessageBox.Text.Trim();
}
<span class="hljs-keyword" style="color: #96cbfe;">if</span>(!<span class="hljs-keyword" style="color: #96cbfe;">string</span>.IsNullOrEmpty(text))
{
<span class="hljs-keyword" style="color: #96cbfe;">bool</span> result = <span class="hljs-literal" style="color: #c6c5fe;">true</span>;
<span class="hljs-keyword" style="color: #96cbfe;">if</span>(result)
{
MessageBox.Text = <span class="hljs-string" style="color: #a8ff60;">""</span>;
}
}
}
<span class="hljs-function"><span class="hljs-keyword" style="color: #96cbfe;">private</span> <span class="hljs-keyword" style="color: #96cbfe;">void</span> <span class="hljs-title" style="color: #ffffb6;">BackButton_Click</span>(<span class="hljs-params"><span class="hljs-keyword" style="color: #96cbfe;">object</span> sender, RoutedEventArgs e</span>)
</span>{
Open(ContactsScreen);
}
</pre></code></figure></div></div></div><div class="stk-grid" data-ce-tag="grid"><div data-col-width="12" class="stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><h2 class="stk-reset stk-theme_26309__style_large_header stk-theme_26309__mb_05" data-ce-tag="paragraph">Заключение</h2><p class="stk-reset " data-ce-tag="paragraph">У нас получился довольно минималистичный дизайн, который вы можете доработать как вам нравится. Дальше нам предстоит написать серверную часть приложения, а потом связать их вместе.</p><div class="stk-grid" data-stk-css="stkDfIs_" data-ce-tag="grid"><div data-col-width="12" class="stk-theme_26309__pad_round_1 stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><p class=" stk-theme_26309__style_small_text stk-reset stk-theme_26309__mb_05" data-ce-tag="paragraph"><strong class="stk-reset">Читайте также:</strong></p><ul class=" stk-theme_26309__style_small_text stk-theme_26309__pad_hor_1 stk-reset" data-ce-tag="list"><li class="stk-list-item stk-reset stk-theme_26309__style_small_text" data-ce-tag="list-item"><a class="stk-reset" href="https://skillbox.ru/media/code/chto-takoe-freymvork-i-kak-vybrat-freymvork-dlya-frontenda-sovety-byvalykh/" target="_blank">Что такое фреймворк и как выбрать фреймворк для фронтенда: советы бывалых</a></li><li class="stk-list-item stk-reset stk-theme_26309__style_small_text" data-ce-tag="list-item"><a class="stk-reset" href="https://skillbox.ru/media/code/pochemu-senoram-nado-posylat-k-chyertu-testovye-zadaniya-6-veskikh-prichin/" target="_blank">Почему сеньорам надо посылать к чёрту тестовые задания: 6 веских причин</a></li><li class="stk-list-item stk-reset stk-theme_26309__style_small_text" data-ce-tag="list-item"><a class="stk-reset" href="https://skillbox.ru/media/code/argumenty_zapuska_v_c_chto_eto_i_kak_ikh_primenyat/" target="_blank">Аргументы запуска в C#: что это и как их применять</a></li></ul></div></div></div></div><style data-stk-css="stkDfIs_" class="" media="all">
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{"@context":"http:\/\/schema.org","@type":"Article","url":"https:\/\/skillbox.ru\/media\/code\/pishem_messendzher_na_c_chast_1_vyerstka\/","headline":"\u041f\u0438\u0448\u0435\u043c \u043c\u0435\u0441\u0441\u0435\u043d\u0434\u0436\u0435\u0440 \u043d\u0430\u00a0C#. \u0427\u0430\u0441\u0442\u044c\u00a01. \u0412\u0451\u0440\u0441\u0442\u043a\u0430","articleSection":"\u041a\u043e\u0434","articleBody":"В этой серии \r\nстатей мы напишем клиент-серверное приложение на C# — простейший мессенджер. Серия состоит из трёх частей:\r\n\r\n- Вёрстка приложения — \r\nмы создадим графический интерфейс на C# и XAML для Windows.\r\n- Создание WebAPI на ASP.NET — \r\nсоставим базу данных и разработаем серверную часть приложения.\r\n- Объединение \r\nклиента и сервера — напишем запросы к серверу и позаботимся, чтобы всё работало как надо.\r\n\r\nЯзык C# пригодится \r\nв разработке чего угодно. Возможности WPF (система создания графических интерфейсов) позволяют создавать красивые и функциональные приложения для Windows, а ASP.NET — мощные серверные приложения.\r\n\r\nЯ постараюсь \r\nобъяснить подробно, но охватить всё невозможно, поэтому вам нужно знать основы C#, ООП, ASP.NET, WPF и работы в Visual Studio.\r\n\r\nВот несколько \r\nстатей, с которыми стоит ознакомиться, если вы чего-то не знаете:\r\n\r\n- ООП в C# \r\n(серия статей).\r\n- Как за час создать \r\nсайт на ASP.NET .\r\n- Что такое MVVM: проектирование \r\nприложений для Windows .\r\n- Асинхронное \r\nпрограммирование: Как работает процессор (серия статей).\r\n\r\nСтруктура приложения\r\n\r\nМы не рассматриваем \r\nрегистрацию, поиск контактов, хранение сообщений, продвинутый дизайн. Вместо этого вы узнаете азы создания клиент-серверных приложений и сможете сделать всё самостоятельно.\r\n\r\nИсходный код \r\nмессенджера вы найдете на GitHub .\r\n\r\nПриложение \r\nмы поделим на экраны:\r\n\r\n- экран авторизации;\r\n- экран с контактами;\r\n- экран с чатом.\r\n\r\nЭкран — это \r\nэлемент Border, который по умолчанию скрыт от пользователя. Виден будет только активный экран.\r\n\r\nНа экране авторизации \r\nпользователь сможет ввести логин и пароль, чтобы войти. Если он ввёл верные данные, то перейдёт на экран с контактами, иначе — увидит сообщение об ошибке.\r\n\r\nНа экране с контактами \r\nвидны имена других пользователей, с которыми ведётся переписка. Чат открывается при нажатии на имя другого пользователя.\r\n\r\nНа экране с чатом \r\nвидна переписка с одним конкретным контактом. Пользователь может написать и отправить новое сообщение или вернуться к экрану с контактами.\r\n\r\nВерстаем экран \r\nавторизации\r\n\r\nНачнём с определения \r\nстилей. В них минимально обозначим, как должны выглядеть элементы, и сразу укажем, что экраны по умолчанию должны быть скрыты:\r\n\r\n\r\n\r\n\r\n\r\n\r\n<Style x:Key=\"Screen\"> <Style.Setters> <Setter Property=\"Border.Visibility\" \r\nValue=\"Hidden\" \/> <Setter Property=\"Border.Background\" Value=\"#151515\" \/> <\/Style.Setters> <\/Style> <Style x:Key=\"LoginPanel\"> <Style.Setters> <Setter Property=\"StackPanel.Orientation\" Value=\"Vertical\" \/> <Setter Property=\"StackPanel.VerticalAlignment\" Value=\"Center\" \/> <\/Style.Setters> <\/Style> <Style x:Key=\"TextBoxBase\"> <Style.Setters> <Setter Property=\"TextBox.Background\" Value=\"#333\" \/> <Setter Property=\"TextBox.Foreground\" Value=\"#f6f6f6\" \/> <Setter Property=\"TextBox.Margin\" Value=\"5\"\/> <Setter Property=\"TextBox.Padding\" Value=\"15 10\"\/> <Setter Property=\"TextBox.HorizontalAlignment\" Value=\"Center\" \/> <Setter Property=\"TextBox.Width\" Value=\"250\" \/> <\/Style.Setters> <\/Style> <Style x:Key=\"ButtonBase\" > <Style.Setters> <Setter Property=\"Button.Background\" Value=\"#333\" \/> <Setter Property=\"Button.Foreground\" Value=\"#f6f6f6\" \/> <Setter Property=\"Button.Margin\" Value=\"5\"\/> <Setter Property=\"Button.Padding\" Value=\"50 10\"\/> <Setter Property=\"Button.HorizontalAlignment\" Value=\"Center\" \/> <Setter Property=\"Button.FontSize\" Value=\"14\" \/> <\/Style.Setters> <\/Style> \r\n\r\nТеперь сверстаем \r\nсам экран авторизации — он должен быть видимым:\r\n\r\n\r\n\r\n\r\n\r\n\r\n<Border Style=\"{StaticResource Screen}\" Name=\"LoginScreen\" Visibility=\"Visible\"> \r\n<StackPanel Style=\"{StaticResource LoginPanel}\"> <TextBlock Text=\"Login\" Style=\"{StaticResource HeaderBlock}\" \/> <TextBox Style=\"{StaticResource TextBoxBase}\" Name=\"LoginBox\" \/> <PasswordBox Style=\"{StaticResource TextBoxBase}\" Name=\"PasswordBox\"\/> <Button Content=\"Enter\" Style=\"{StaticResource ButtonBase}\" Name=\"LoginButton\" Click=\"LoginButton_Click\" IsDefault=\"True\"\/> <TextBlock Text=\"\" Name=\"LoginMessageBlock\" Style=\"{StaticResource WarningBlock}\" Visibility=\"Hidden\"\/> <\/StackPanel> <\/Border> \r\n\r\nДавайте посмотрим, \r\nкак это выглядит:\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n \r\n \r\n\r\nТеперь напишем \r\nобработчик для кнопки Enter:\r\n\r\n\r\n\r\n\r\n\r\n\r\n\/\/Обработчик \r\nнажатия на кнопку Login private void LoginButton_Click(object sender, RoutedEventArgs e) { \/\/Пока используем тестовые данные if(LoginBox.Text == \"admin\" && PasswordBox.Password == \"12345\") { \/\/Если логин и пароль верные, то переходим на другой экран Open(ContactsScreen); } else { \/\/Иначе выводим сообщение об ошибке авторизации LoginMessageBlock.Text = \"Wrong login or password!\"; LoginMessageBlock.Visibility = Visibility.Visible; } } \/\/Метод для открытия другого экрана private void Open(Border screen) { \/\/Делаем все экраны невидимыми LoginScreen.Visibility = Visibility.Hidden; ContactsScreen.Visibility = Visibility.Hidden; ChatScreen.Visibility = Visibility.Hidden; \/\/Делаем видимым необходимый экран screen.Visibility = Visibility.Visible; } \r\n\r\nУ вас должны \r\nбыть экраны с именами ContactsScreen и ChatScreen, чтобы метод Open () работал корректно. Для этого достаточно создать два пустых элемента Border.\r\n\r\nВот как выглядит \r\nэкран авторизации при вводе неверных данных:\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n \r\n \r\n\r\nДальше сверстаем \r\nэкран с контактами.\r\n\r\nВерстаем экран \r\nс контактами\r\n\r\nЭкран с контактами \r\nразделим на два ряда с помощью Grid — заголовок в первом ряду и список контактов во втором. Список — это элемент ListBox, в котором перечислены контакты.\r\n\r\n\r\n\r\n\r\n\r\n\r\n<Border Name=\"ContactsScreen\" Style=\"{StaticResource Screen}\"> <Grid> \r\n<Grid.RowDefinitions> <RowDefinition Height=\"50\" \/> <RowDefinition \/> <\/Grid.RowDefinitions> <Border Grid.Row=\"0\" Style=\"{StaticResource HeaderBorder}\"> <TextBlock Style=\"{StaticResource HeaderBlock}\" Text=\"Contacts\" VerticalAlignment=\"Center\"\/> <\/Border> <Border Grid.Row=\"1\"> <ListBox ScrollViewer.VerticalScrollBarVisibility=\"Auto\" ScrollViewer.CanContentScroll=\"True\" Style=\"{StaticResource ContactsList}\" Name=\"ContactsList\" SelectionChanged=\"ContactsList_SelectionChanged\"> <ListBox.ItemTemplate> <DataTemplate> <ListBoxItem> <DockPanel LastChildFill=\"True\"> <Image Style=\"{StaticResource ContactImage}\" DockPanel.Dock=\"Left\"><\/Image> <TextBlock Text=\"{Binding Name}\" Style=\"{StaticResource ContactName}\" DockPanel.Dock=\"Right\"\/> <\/DockPanel> <\/ListBoxItem> <\/DataTemplate> <\/ListBox.ItemTemplate> <\/ListBox> <\/Border> <\/Grid> <\/Border> \r\n\r\nЗдесь описаны \r\nне все элементы списка, а только шаблон для них, который будет использоваться во время привязки данных. Этот шаблон понадобится в готовом приложении, но для удобства вёрстки вы можете подготовить тестовые данные.\r\n\r\nЗададим стили:\r\n\r\n\r\n\r\n\r\n\r\n\r\n<Style x:Key=\"ContactsList\" BasedOn=\"{StaticResource TextBlockBase}\"> \r\n<Style.Setters> <Setter Property=\"ListBox.Background\" Value=\"#151515\"\/> <Setter Property=\"ListBox.BorderThickness\" Value=\"0\"\/> <\/Style.Setters> <\/Style> <Style x:Key=\"ContactImage\" BasedOn=\"{StaticResource TextBlockBase}\"> <Style.Setters> <\/Style.Setters> <\/Style> <Style x:Key=\"ContactName\" BasedOn=\"{StaticResource TextBlockBase}\"> <Style.Setters> <Setter Property=\"TextBlock.HorizontalAlignment\" Value=\"Left\"\/> <\/Style.Setters> <\/Style> <Style x:Key=\"HeaderBorder\"> <Style.Setters> <Setter Property=\"Border.Background\" Value=\"#222\" \/> <\/Style.Setters> <\/Style> \r\n\r\nТеперь остаётся \r\nнаписать метод, который открывает чат с контактом. Этот метод вызывается, когда пользователь выберет пункт из списка.\r\n\r\n\r\n\r\n\r\n\r\n\r\nprivate void ContactsList_SelectionChanged(object sender, SelectionChangedEventArgs \r\ne) { \/\/Метод вызывается, когда меняется индекс выделенного элемента \/\/При выделении элемент списка будет подсвечиваться \/\/Чтобы убрать это, мы будем менять индекс на -1 \/\/Чтобы метод не срабатывал повторно, мы проверяем, чтобы индекс был больше или равен 0 if(ContactsList.SelectedIndex >= 0) { \/\/Тут будет код загрузки сообщений из чата \/\/Сбрасываем индекс ContactsList.SelectedIndex = -1; Open(ChatScreen); } } \r\n\r\nВерстаем экран \r\nс чатом\r\n\r\nЧат похож на экран \r\nс контактами, но немного дополненный:\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n \r\n \r\n\r\nGrid делит экран \r\nна три части: заголовок, чат и поле ввода. В заголовке — имя собеседника и кнопка «Назад». В чате выведены сообщения с помощью ListBox, а внизу находятся поле ввода и кнопка отправки.\r\n\r\n\r\n\r\n\r\n\r\n\r\n<Border Name=\"ChatScreen\" Style=\"{StaticResource Screen}\"> <Grid> \r\n<Grid.RowDefinitions> <RowDefinition Height=\"50\" \/> <RowDefinition \/> <RowDefinition Height=\"50\"\/> <\/Grid.RowDefinitions> <Border Grid.Row=\"0\" Style=\"{StaticResource HeaderBorder}\"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width=\"1*\" \/> <ColumnDefinition Width=\"6*\" \/> <ColumnDefinition Width=\"1*\" \/> <\/Grid.ColumnDefinitions> <Button Style=\"{StaticResource NavButton}\" Grid.Column=\"0\" Name=\"BackButton\" Content=\"←\" Click=\"BackButton_Click\"\/> <TextBlock Style=\"{StaticResource HeaderBlock}\" Text=\"\" VerticalAlignment=\"Center\" Name=\"ChatName\" Grid.Column=\"1\"\/> <\/Grid> <\/Border> <Border Grid.Row=\"1\"> <ListBox ScrollViewer.VerticalScrollBarVisibility=\"Auto\" ScrollViewer.CanContentScroll=\"True\" Style=\"{StaticResource ContactsList}\" Name=\"MessagesList\" Focusable=\"False\" HorizontalAlignment=\"Stretch\" HorizontalContentAlignment=\"Stretch\"> <ListBox.ItemTemplate> <DataTemplate> <ListBoxItem> <Border Style=\"{StaticResource MessageBorder}\" HorizontalAlignment=\"{Binding Alignment}\"> <StackPanel Orientation=\"Vertical\"> <TextBlock Text=\"{Binding Text}\" Style=\"{StaticResource MessageText}\"\/> <TextBlock Text=\"{Binding Date}\" Style=\"{StaticResource MessageDate}\"\/> <\/StackPanel> <\/Border> <\/ListBoxItem> <\/DataTemplate> <\/ListBox.ItemTemplate> <\/ListBox> <\/Border> <Border Grid.Row=\"2\" Style=\"{StaticResource HeaderBorder}\"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width=\"6*\" \/> <ColumnDefinition Width=\"1*\" \/> <\/Grid.ColumnDefinitions> <TextBox Name=\"MessageBox\" Style=\"{StaticResource MessageBox}\" Grid.Column=\"0\"\/> <Button Style=\"{StaticResource NavButton}\" Grid.Column=\"1\" Name=\"SendButton\" Content=\"→\" Click=\"SendButton_Click\"\/> <\/Grid> <\/Border> <\/Grid> <\/Border> \r\n\r\nТут, как на экране \r\nс контактами, пока нет данных -— только шаблон для их вывода. Немного стилей:\r\n\r\n\r\n\r\n\r\n\r\n\r\n<Style x:Key=\"MessageBorder\"> <Style.Setters> <Setter Property=\"Border.Background\" \r\nValue=\"#555\" \/> <Setter Property=\"Border.CornerRadius\" Value=\"13\" \/> <Setter Property=\"Border.MinWidth\" Value=\"100\" \/> <Setter Property=\"Border.MaxWidth\" Value=\"300\" \/> <Setter Property=\"Border.Padding\" Value=\"2\" \/> <\/Style.Setters> <\/Style> <Style x:Key=\"MessageText\" BasedOn=\"{StaticResource TextBlockBase}\"> <Style.Setters> <Setter Property=\"TextBlock.TextWrapping\" Value=\"Wrap\" \/> <Setter Property=\"TextBlock.Margin\" Value=\"0\" \/> <\/Style.Setters> <\/Style> <Style x:Key=\"MessageDate\" BasedOn=\"{StaticResource TextBlockBase}\"> <Style.Setters> <Setter Property=\"TextBlock.HorizontalAlignment\" Value=\"Right\" \/> <Setter Property=\"TextBlock.FontSize\" Value=\"8\" \/> <Setter Property=\"TextBlock.Margin\" Value=\"0\" \/> <\/Style.Setters> <\/Style> \r\n\r\nОстаётся только \r\nобработать события для кнопок отправки и навигации:\r\n\r\n\r\n\r\n\r\n\r\n\r\nprivate void SendButton_Click(object sender, RoutedEventArgs e) { string \r\ntext = \"\"; if(!string.IsNullOrEmpty(MessageBox.Text)) { text = MessageBox.Text.Trim(); } if(!string.IsNullOrEmpty(text)) { bool result = true; if(result) { MessageBox.Text = \"\"; } } } private void BackButton_Click(object sender, RoutedEventArgs e) { Open(ContactsScreen); } \r\n\r\nЗаключение\r\n\r\nУ нас получился \r\nдовольно минималистичный дизайн, который вы можете доработать как вам нравится. Дальше нам предстоит написать серверную часть приложения, а потом связать их вместе.\r\n\r\n\r\n\r\nЧитайте также:\r\n\r\n- Что такое фреймворк \r\nи как выбрать фреймворк для фронтенда: советы бывалых \r\n- Почему сеньорам \r\nнадо посылать к чёрту тестовые задания: 6 веских причин \r\n- Аргументы запуска \r\nв C#: что это и как их применять ","author":{"@type":"Person","name":"\u0415\u0432\u0433\u0435\u043d\u0438\u0439 \u041a\u0443\u0447\u0435\u0440\u044f\u0432\u044b\u0439","url":"https:\/\/skillbox.ru\/media\/authors\/evgenij-kucheryavyj\/"},"publisher":{"@type":"Organization","name":"Skillbox","logo":{"@type":"ImageObject","url":"https:\/\/skillbox.ru\/static\/images\/skillbox.png"}},"mainEntityOfPage":{"@type":"WebPage","url":"https:\/\/skillbox.ru\/media\/code\/pishem_messendzher_na_c_chast_1_vyerstka\/"},"datePublished":"2020-06-24T09:00:00Z","dateModified":"2025-11-13T17:57:29Z","image":{"@type":"ImageObject","url":["https:\/\/248006.selcdn.ru\/main\/iblock\/ee6\/ee65b7c4bf24e407ab9217bb5b786b02\/880dd82ab50f42915e0f97d84b7aa4a1.png"]},"description":"\u041a\u043b\u0438\u0435\u043d\u0442-\u0441\u0435\u0440\u0432\u0435\u0440\u043d\u0430\u044f \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0430 — \u043e\u0434\u043d\u0430 \u0438\u0437 \u0441\u0430\u043c\u044b\u0445 \u0432\u043e\u0441\u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043e\u0442\u0440\u0430\u0441\u043b\u0435\u0439 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f. \u0417\u043d\u0430\u044f \u0435\u0451 \u0430\u0437\u044b, \u043c\u043e\u0436\u043d\u043e \u0441\u043e\u0437\u0434\u0430\u0432\u0430\u0442\u044c \u043a\u0430\u043a \u043c\u0435\u0441\u0441\u0435\u043d\u0434\u0436\u0435\u0440\u044b, \u0442\u0430\u043a \u0438 \u043e\u043d\u043b\u0430\u0439\u043d-\u0438\u0433\u0440\u044b."}
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