c# - 将自定义控件内的 TextBlock 绑定(bind)到同一自定义控件的依赖属性

Question

我有一个自定义控件，里面有一个 TextBlock:

<Style TargetType="{x:Type local:CustControl}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type local:CustControl}">
                <Border Background="Blue"
                        Height="26" 
                        Width="26" Margin="1">

                        <TextBlock x:Name="PART_CustNo"
                                   FontSize="10"
                                   Text="{Binding Source=CustControl,Path=CustNo}" 
                                   Background="PaleGreen" 
                                   Height="24" 
                                   Width="24"
                                   Foreground="Black">
                        </TextBlock>

                </Border>
             </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

并且这个自定义控件有一个依赖属性:

    public class CustControl : Control
{
    static CustControl()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(CustControl), new   FrameworkPropertyMetadata(typeof(CustControl)));
    }

    public readonly static DependencyProperty CustNoProperty = DependencyProperty.Register("CustNo", typeof(string), typeof(CustControl), new PropertyMetadata(""));

    public string CustNo
    {
        get { return (string)GetValue(CustNoProperty); }
        set { SetValue(CustNoProperty, value); }
    }

}

我希望在自定义控件的每个实例中将“CustNo”属性的值传输到 TextBlock 的“Text”属性中。但是我的:

Text="{Binding Source=CustControl,Path=CustNo}"

不工作。

不适用于 Path=CustNoProperty:

Text="{Binding Source=CustControl,Path=CustNoProperty}"

Answer 1

你需要一个TemplateBinding，比如

<TextBlock
   Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=CustNo}" />