鼠标悬停效果只能在WPF中的TextBlock上工作

Question

我想检查wpf控件上的MouseOver效果。在我的代码中，它只能在文本块上工作，而不能在其他文件上工作。代码是正确的，没有错误产生。我在哪里可以获得触发器的属性值？

<Window x:Class="RoutedEventPr.MainWindow" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    Title="MainWindow" Height="350" Width="525"> 

<Grid Width="200" Height="100" Background="AliceBlue" > 
    <Grid.Style> 
     <Style TargetType="{x:Type Grid}"> 
      <Style.Triggers> 
       <Trigger Property="IsMouseOver" Value="True"> 
        <Setter Property="Background" Value="Red"/> 
       </Trigger> 
      </Style.Triggers> 
     </Style> 
    </Grid.Style> 
    <Ellipse Fill="#FF3AB0B0" StrokeThickness="4" Width="200" Height="100"> 
     <Ellipse.Effect> 
      <DropShadowEffect/> 
     </Ellipse.Effect> 
     <Ellipse.Style> 
      <Style TargetType="{x:Type Ellipse}"> 
       <Style.Triggers> 
        <Trigger Property="IsMouseOver" Value="True"> 
         <Setter Property="Fill" Value="Red"/> 
        </Trigger> 
       </Style.Triggers> 
      </Style> 
     </Ellipse.Style> 
    </Ellipse> 
    <TextBlock Text="Press" HorizontalAlignment="Center" VerticalAlignment="Center"> 
     <TextBlock.Style> 
      <Style TargetType="{x:Type TextBlock}"> 
       <Style.Triggers> 
        <Trigger Property="IsMouseOver" Value="True"> 
         <Setter Property="Background" Value="Red"/> 
        </Trigger> 
       </Style.Triggers> 
      </Style> 
     </TextBlock.Style> 
    </TextBlock> 
</Grid> 

Answer 1

因为TextBlock在这里，你有Background对Grid和Fill对Ellipse你不用手动设置的初始值的唯一控制。如果你想Trigger能够覆盖你需要把它纳入Style为Setter

<Grid Width="200" Height="100" > 
    <Grid.Style> 
     <Style TargetType="{x:Type Grid}"> 
      <Setter Property="Background" Value="AliceBlue"/> 
      <Style.Triggers> 
       <Trigger Property="IsMouseOver" Value="True"> 
        <Setter Property="Background" Value="Red"/> 
       </Trigger> 
      </Style.Triggers> 
     </Style> 
    </Grid.Style> 
    <Ellipse StrokeThickness="4" Width="200" Height="100"> 
     <Ellipse.Effect> 
      <DropShadowEffect/> 
     </Ellipse.Effect> 
     <Ellipse.Style> 
      <Style TargetType="{x:Type Ellipse}"> 
       <Setter Property="Fill" Value="#FF3AB0B0"/> 
       <Style.Triggers> 
        <Trigger Property="IsMouseOver" Value="True"> 
         <Setter Property="Fill" Value="Red"/> 
        </Trigger> 
       </Style.Triggers> 
      </Style> 
     </Ellipse.Style> 
    </Ellipse> 
    <TextBlock Text="Press" HorizontalAlignment="Center" VerticalAlignment="Center"> 
     <TextBlock.Style> 
      <Style TargetType="{x:Type TextBlock}"> 
       <Style.Triggers> 
        <Trigger Property="IsMouseOver" Value="True"> 
         <Setter Property="Background" Value="Red"/> 
        </Trigger> 
       </Style.Triggers> 
      </Style> 
     </TextBlock.Style> 
    </TextBlock> 
</Grid> 

DependencyProperty默认值如下源层次和手动价值超过Style优先。您可以阅读更多Dependency Property Setting Precedence List