为什么IsChecked不会更改此切换按钮？

Question

我有以下用于切换按钮的xaml:

<ToggleButton Margin="0,3" Grid.Row="3" Grid.ColumnSpan="2" Command="{Binding DataContext.SelectAllCommand, Mode=OneWay, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}}">
  <ToggleButton.Style>
   <Style TargetType="{x:Type ToggleButton}">
       <Setter Property="Content" Value="Select All"/>
       <Style.Triggers>
            <Trigger Property="IsChecked" Value="True">
                <Setter Property="Content" Value="Select None"/>
                <Setter Property="Command" Value="{Binding DataContext.SelectNoneCommand, Mode=OneWay, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}}"/>
            </Trigger>
          </Style.Triggers>
      </Style>
  </ToggleButton.Style>
</ToggleButton>

但是IsChecked单击按钮时,属性永远不会更新.

如果我使用snoop并强制IsChecked为True,那么触发器就会启动.

Answer 1

我试过你的ToggleButton,它运行正常.我看到的唯一问题是你明确地设置了Command.它应该用一个Setter代替(就像你做的那样Content)来打破Trigger.

<ToggleButton Name="toggleButton" Margin="0,3" Grid.Row="3" Grid.ColumnSpan="2">
    <ToggleButton.Style>
        <Style TargetType="{x:Type ToggleButton}">
            <Setter Property="Content" Value="Select All"/>
            <Setter Property="Command"
                    Value="{Binding DataContext.SelectAllCommand,
                                    Mode=OneWay,
                                    RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}}"/>
            <Style.Triggers>
                <Trigger Property="IsChecked" Value="True">
                    <Setter Property="Content" Value="Select None"/>
                    <Setter Property="Command" Value="{Binding DataContext.SelectNoneCommand, Mode=OneWay, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}}"/>
                </Trigger>
            </Style.Triggers>
        </Style>
    </ToggleButton.Style>
</ToggleButton>

如果你仍然无法点击它,我会检查是否IsHitTestVisible设置了相似或类似False的可视树.

如果你想将你的版本与我的测试应用进行比较,看看哪些不起作用,我在这里上传了它:http://www.mediafire.com/？ik24ftsfw2wwfwb