只有一个 TextBlock 的用户控件。 如何向消费者公开 TextWrapping 属性？

Question

I have a minimalist UserControl containing a single TextBlock which I prototype as follows:

<Grid>
    <TextBlock x:Name="textBlockExt" x:FieldModifier="public"/>
</Grid>

public partial class TextBlockExt : UserControl
{
    public TextBlockExt()
    {
        InitializeComponent();

        DataContext = this;
    }

    public string Text
    {
        get => textBlockExt.Text;
        set { textBlockExt.Text = value.ToUpper(); } // to be expanded later
    }
}

I then consume the control by

<Grid>
    <StackPanel>
        <local:TextBlockExt FontSize="30" x:Name="txb" Text="Hello World" TextBlock.TextAlignment="Center"/>
        <Button Content="To Upper" Width="100" Click="Button_Click"/>
    </StackPanel>
</Grid>

And it's code behind is

public MainWindow()
{
    InitializeComponent();

    txb.textBlockExt.TextWrapping = TextWrapping.WrapWithOverflow;
}

private void Button_Click(object sender, RoutedEventArgs e)
{
    txb.Text = "one two three four five six seven eight";
}

I don't like the code in the MainWindow constructor above and need to know how to set the T extWrapping in the XAML.

Answer 1

Add a property TextWrapping to your TextBlockExt class. Use the same way you did for the Text property:

public TextWrapping TextWrapping {
    get => txtBlockExt.TextWrapping;
    set { txtBlockExt.TextWrapping = value: }
}