WPF ControlTemplate和Binding

Question

在下面的代碼中，MousePressImage是ButtonControl類的依賴項屬性。 以下綁定不起作用。感謝您解決此問題的幫助。

Value="{Binding RelativeSource={x:Static RelativeSource.Self}, 
       Path=MousePressImage}"/> 


<Style TargetType="{x:Type local:ButtonControl}"> 
    <Setter Property="Template"> 
    <Setter.Value> 
     <ControlTemplate TargetType="{x:Type local:ButtonControl}"> 
     <Border> 
      <Image x:Name="img" 
       Source="pack://application:,,,/Recipe_06_13;component/Resources/normal.bmp" 
       /> 
     </Border> 
     <!--<Border x:Name="border"> 
      <Border.Background> 
      <ImageBrush x:Name="img" 
         ImageSource="/Recipe_06_13;component/Resources/fatal.png"/> 
      </Border.Background> 
     </Border>--> 
     <ControlTemplate.Triggers> 
      <Trigger Property="IsPressed" Value="True"> 
      <Setter TargetName="img" 
        Property="Source" 
        Value="{Binding RelativeSource={x:Static RelativeSource.Self}, 
           Path=MousePressImage}"/> 
      </Trigger> 
     </ControlTemplate.Triggers> 
     </ControlTemplate> 
    </Setter.Value> 
    </Setter> 
</Style> 

我創建了這樣的ButtonControl。

<local:ButtonControl Height="48" Width="160" 
    MouseOverImage="pack://application:,,,/Recipe_06_13;component/Resources/Over.bmp" 
    MousePressImage="pack://application:,,,/Recipe_06_13;component/Resources/Press.bmp" 
    DisableImage=" "> 
</local:ButtonControl> 

Answer 1

因爲你的觸發器是在控件模板，你需要從控件實例獲取MousePressImage被模板。要做到這一點，使用TemplateBinding或（更可靠）RelativeSource TemplatedParent：

<Setter TargetName="img" 
     Property="Source" 
     Value="{Binding RelativeSource={RelativeSource TemplatedParent}, 
         Path=MousePressImage}" />