Question

在我阅读WPF期间，我遇到了一个问题，试图在模板中的Trigger上创建一个绑定，用于创建一个图像按钮。

<ControlTemplate x:Key="ToolbarButtonHover" TargetType="Button">
    <Grid Name="backgroundGrid">
        <Image Source="{DynamicResource ResourceKey=Img}" Width="{TemplateBinding Width}" Height="{TemplateBinding Height}"></Image>
    </Grid>
    <ControlTemplate.Triggers>
        <Trigger Property="Button.IsPressed" Value="True">
            <Setter TargetName="backgroundGrid" Property="Background" Value="#007ACC" />
        </Trigger>
        <!--Error: The property 'Binding' was not found in type Trigger-->
        <Trigger Binding="{Binding Path=IsMouseOver, RelativeSource={RelativeSource TemplatedParent}}" Value="True">
            <Setter TargetName="backgroundGrid" Property="Background" Value="Red" />
        </Trigger>
    </ControlTemplate.Triggers>
</ControlTemplate>

导致错误The property 'Binding' was not found in type Trigger，更具体地说是该行 <Trigger Binding="{ Path=IsMouseOver, RelativeSource={RelativeSource TemplatedParent}}" Value="True">生成它。

出现此错误的原因是什么？

Answer 1

可能是因为Trigger类as you can see here上没有Binding属性。

您可能正在寻找DataTrigger。

<ControlTemplate x:Key="ToolbarButtonHover" TargetType="Button">
    <Grid Name="backgroundGrid">
        <Image Source="{DynamicResource ResourceKey=Img}" Width="{TemplateBinding Width}" Height="{TemplateBinding Height}"></Image>
    </Grid>
    <ControlTemplate.Triggers>
        <Trigger Property="Button.IsPressed" Value="True">
            <Setter TargetName="backgroundGrid" Property="Background" Value="#007ACC" />
        </Trigger>
        <!--Look below, DataTrigger -->
        <DataTrigger Binding="{Binding Path=IsMouseOver, RelativeSource={RelativeSource TemplatedParent}}" Value="True">
            <Setter TargetName="backgroundGrid" Property="Background" Value="Red" />
        </Trigger>
    </ControlTemplate.Triggers>
</ControlTemplate>

触发器没有绑定属性

1 个答案: