Question

我有一个Custom Control依赖属性Header。在Generic.xaml中，有一种控件的样式。我想设置模板某些部分的可见性，以便它取决于控件的Header属性。

<Style TargetType="{x:Type CustomControl1}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type CustomControl1}">
                <Grid MinWidth="400" Focusable="False">
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto" />
                        <RowDefinition />
                    </Grid.RowDefinitions>

                    <TextBlock Text="{TemplateBinding Header}" 
                               Style="{DynamicResource SomeStyle}" 
                               Margin="0,0,80,0"
                               Grid.Row="0" Grid.Column="0">
                        <TextBlock.Visibility>



                            <Binding Path="{TemplateBinding Header}">

                            or alternatively

                            <Binding Path="{Binding Path=Header, RelativeSource={RelativeSource TemplatedParent}}">



                                <Binding.Converter>
                                    <converters:ValueConverterGroup>
                                        <converters:StringNullOrEmptyToBooleanConverter />
                                        <BooleanToVisibilityConverter />
                                    </converters:ValueConverterGroup>
                                </Binding.Converter>
                            </Binding>
                        </TextBlock.Visibility>
                    </TextBlock>

                   ...

此行抛出异常：

<Binding Path="{Binding Path=Header, RelativeSource={RelativeSource TemplatedParent}}">

根据异常消息，Binding内部的Path属性中没有绑定（我已经知道了）xD

如果没有双重绑定，怎么办呢？如何在不使用TemplateBinding的情况下访问Custom Control的属性？

Answer 1

Path的

Binding属性不是DependencyProperty，我怀疑你可能希望它是这样的：

<TextBlock.Visibility>
   <Binding Path="Header" RelativeSource="{RelativeSource TemplatedParent}">
          <Binding.Converter>
              <converters:ValueConverterGroup>
                   <converters:StringNullOrEmptyToBooleanConverter />
                    <BooleanToVisibilityConverter />
              </converters:ValueConverterGroup>
          </Binding.Converter>
   </Binding>
</TextBlock.Visibility>

绑定路径中的TemplateBinding

1 个答案: