lab

Привязка (Binding). Интерфейс INotifyPropertyChanged. Форматирование значений привязки и конвертеры значений.

xml

    <TextBox 
        x:Name="myTextBox" 
        Height="30" />
    <TextBlock 
        x:Name="myTextBlock" 
        Text="{Binding 
        ElementName=myTextBox,
        Path=Text}"
        Height="30" />
</StackPanel>

csharp

namespace WpfApp1 {

public partial class MainWindow : Window
{
    public MainWindow() {

    InitializeComponent();

    Binding binding = new Binding();

    // ýëåìåíò-èñòî÷íèê
    binding.ElementName = "myTextBox";

    // ñâîéñòâî ýëåìåíòà-èñòî÷íèêà
    binding.Path = new PropertyPath("Text");

    // óñòàíîâêà ïðèâÿçêè äëÿ ýëåìåíòà-ïðèåìíèêà
    myTextBlock.SetBinding(TextBlock.TextProperty, binding);
    }
 }

}

Свойство Source

xml

<local:Phone 
    x:Key="nexusPhone" 
    Title="Nexus X5" 
    Company="Google" 
    Price="25000" />

<Grid.RowDefinitions>
    <RowDefinition />
    <RowDefinition />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
    <ColumnDefinition />
    <ColumnDefinition />
</Grid.ColumnDefinitions>
<TextBlock 
    Text="Ìîäåëü:" 
    Foreground="White"/>
<TextBlock 
    x:Name="titleTextBlock" 
    Text="{Binding 
        Source={StaticResource nexusPhone}, 
        Path=Title}"
    Foreground="White" 
    Grid.Column="1"/>
<TextBlock 
    Text="Öåíà:" 
    Foreground="White" 
    Grid.Row="1"/>
<TextBlock 
    x:Name="priceTextBlock" 
    Text="{Binding 
        Source={StaticResource nexusPhone}, 
        Path=Price}"
    Foreground="White" 
    Grid.Column="1" 
    Grid.Row="1"/>

csharp

namespace WpfApp1 {

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }
}

class Phone
{
    public string Title { get; set; }
    public string Company { get; set; }
    public int Price { get; set; }
}

}

Свойство TargetNullValue

xml

<local:Phone 
    x:Key="nexusPhone" 
    Company="Google" 
    Price="25000" />

<TextBlock 
    x:Name="titleTextBlock"
    Text="{Binding 
        Source={StaticResource nexusPhone}, 
        Path=Title, 
        TargetNullValue=Òåêñò ïî óìîë÷àíèþ}" />

Свойство RelativeSource

xml

    <TextBlock 
    Foreground="Black"
    Text="{Binding 
        RelativeSource={RelativeSource 
            Mode=FindAncestor,
            AncestorType={x:Type Grid}}, 
        Path=Background}" />
</Grid>

Свойство DataContext

    <local:Phone 
    x:Key="nexusPhone" 
    Title="Nexus X5" 
    Company="Google" 
    Price="25000" />
</Window.Resources>
<Grid 
DataContext="{StaticResource nexusPhone}" 

    <Grid.ColumnDefinitions>
        <ColumnDefinition />
        <ColumnDefinition />
        <ColumnDefinition />
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition />
        <RowDefinition />
    </Grid.RowDefinitions>
    <TextBlock 
    Text="Ìîäåëü" />
    <TextBlock 
    Text="{Binding Title}" 
    Grid.Row="1" />
    <TextBlock 
    Text="Ïðîèçâîäèòåëü" 
    Grid.Column="1"/>
    <TextBlock 
    Text="{Binding Company}" 
    Grid.Column="1" 
    Grid.Row="1" />
    <TextBlock 
    Text="Öåíà" 
    Grid.Column="2" />
    <TextBlock 
    Text="{Binding Price}" 
    Grid.Column="2" 
    Grid.Row="1" />
</Grid>

# Интерфейс INotifyPropertyChanged

    <local:Phone 
    x:Key="nexusPhone" 
    Title="Nexus X5" 
    Company="Google" 
    Price="25000" />
</Window.Resources>
<Grid>
    <TextBlock 
    Text="{Binding 
        StringFormat=Èòîãîâàÿ öåíà {0} ðóáëåé, 
        Source={StaticResource nexusPhone}, 
        Path=Price}" />
</Grid>