在Trigger错误中设置TextDecoration

Posted 2021-05-03

最初我试图通过触发器在TextDecoration中更改笔的颜色，但是当我设置x：笔的名称属性时，我有一个错误，找不到目标，所以我将模板更改为以下内容：

<ControlTemplate x:Key="TabButton" TargetType="{x:Type Button}">
    <Border x:Name="border" Padding="10,5" CornerRadius="5,5,0,0" Background="#62A9FF">
        <TextBlock x:Name="text" Text="{TemplateBinding Content}"
                   Cursor="Hand" Foreground="#F9FCFF">
            <TextBlock.TextDecorations>
              <TextDecoration Location="Underline" 
                PenThicknessUnit="FontRecommended">
                <TextDecoration.Pen>
                  <Pen Brush="White" Thickness="1">
                    <Pen.DashStyle>
                      <DashStyle Dashes="5"/>
                    </Pen.DashStyle>
                  </Pen>
                </TextDecoration.Pen>
              </TextDecoration>
            </TextBlock.TextDecorations>
        </TextBlock>
    </Border>
    <ControlTemplate.Triggers>
        <Trigger Property="local:MainWindow.TabActive" Value="False">
            <Setter TargetName="border" Property="Background" Value="Transparent"/>
            <Setter TargetName="text" Property="Foreground" Value="Black"/>
            <Setter TargetName="text" Property="TextDecorations">
                <Setter.Value>
                    <TextDecorationCollection>
                        <TextDecoration Location="Underline">
                            <TextDecoration.Pen>
                                <Pen Brush="Gray" Thickness="1">
                                    <Pen.DashStyle>
                                        <DashStyle Dashes="5"/>
                                    </Pen.DashStyle>
                                </Pen>
                            </TextDecoration.Pen>
                        </TextDecoration>
                     </TextDecorationCollection>
                </Setter.Value>
            </Setter>
        </Trigger>
    </ControlTemplate.Triggers>
</ControlTemplate>

现在应用程序构建没有错误，但当我运行它我得到错误：

无法将类型为“System.Windows.TextDecoration”的内容添加到System.Windows.TextDecorationCollection类型的对象中

怎么了？或者可能有另一种方式？

答案

无法重现这样的错误。请注意，即使没有错误，您的触发器也不会起作用，因为您直接在目标对象上设置了precedence超过触发器设置器的值。

以下是变量TextDecorations的示例，它可以在鼠标悬停时进行更改：

<ContentControl Content="Test">
    <ContentControl.Template>
        <ControlTemplate TargetType="{x:Type ContentControl}">
            <TextBlock Name="tb" Text="{TemplateBinding Content}">
                <TextBlock.Style>
                    <Style TargetType="{x:Type TextBlock}">
                        <Setter Property="TextDecorations">
                            <Setter.Value>
                                <TextDecorationCollection>
                                    <TextDecoration>
                                        <TextDecoration.Pen>
                                            <Pen Brush="Blue" />
                                        </TextDecoration.Pen>
                                    </TextDecoration>
                                </TextDecorationCollection>
                            </Setter.Value>
                        </Setter>
                    </Style>
                </TextBlock.Style>
            </TextBlock>
            <ControlTemplate.Triggers>
                <Trigger Property="ContentControl.IsMouseOver" Value="True">
                    <Setter TargetName="tb" Property="TextDecorations">
                        <Setter.Value>
                            <TextDecorationCollection>
                                <TextDecoration>
                                    <TextDecoration.Pen>
                                        <Pen Brush="Red" />
                                    </TextDecoration.Pen>
                                </TextDecoration>
                            </TextDecorationCollection>
                        </Setter.Value>
                    </Setter>
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
    </ContentControl.Template>
</ContentControl>

另一答案

我是一个类似的方法，但没有模板控制。

<TextBlock Text="5000.00" FontSize="20" >
    <TextBlock.Style>
        <Style TargetType="TextBlock">
            <Style.Triggers>
                <Trigger Property ="IsMouseOver" Value="True">
                    <Setter Property="TextDecorations">
                        <Setter.Value>
                            <TextDecorationCollection>
                                <TextDecoration Location="Underline">
                                    <TextDecoration.Pen>
                                        <Pen Brush="Red"/>
                                    </TextDecoration.Pen>
                                </TextDecoration>
                            </TextDecorationCollection>
                        </Setter.Value>
                    </Setter>
                </Trigger>
                <Trigger Property ="IsMouseOver" Value="False">
                    <Setter Property="TextDecorations">
                        <Setter.Value>
                            <TextDecorationCollection>
                                <TextDecoration Location="Underline">
                                    <TextDecoration.Pen>
                                        <Pen Brush="LimeGreen"/>
                                    </TextDecoration.Pen>
                                </TextDecoration>
                            </TextDecorationCollection>
                        </Setter.Value>
                    </Setter>
                </Trigger>
            </Style.Triggers>
        </Style>
    </TextBlock.Style>
</TextBlock>