如何在DataTrigger中切換TextBlock的可見性？

此代碼工作（當ControlType = 「下拉列表」，然後背景黃色）：如何在DataTrigger中切換TextBlock的可見性？

<Window x:Class="TestCollapsed.Views.MainView" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:c="clr-namespace:TestCollapsed.Commands" 
    Title="Main Window" Height="400" Width="800"> 
    <Window.Resources> 
     <Style x:Key="DropDownStyle" TargetType="TextBlock"> 
      <Style.Triggers> 
       <DataTrigger Binding="{Binding ControlType}" Value="dropDown"> 
        <Setter Property="Background" Value="Yellow"/> 
       </DataTrigger> 
      </Style.Triggers> 
     </Style> 
    </Window.Resources> 

    <StackPanel> 
     <TextBlock Visibility="Visible" 
        Text="This is going to be the dropdown control." 
        Style="{StaticResource DropDownStyle}"/> 
    </StackPanel> 
</Window>

但是這個代碼不不工作（當ControlType = 「下拉列表」，然後將TextBlock仍然隱形）：

<Window x:Class="TestCollapsed.Views.MainView" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:c="clr-namespace:TestCollapsed.Commands" 
    Title="Main Window" Height="400" Width="800"> 
    <Window.Resources> 
     <Style x:Key="DropDownStyle" TargetType="TextBlock"> 
      <Style.Triggers> 
       <DataTrigger Binding="{Binding ControlType}" Value="dropDown"> 
        <Setter Property="Visibility" Value="Visible"/> 
       </DataTrigger> 
      </Style.Triggers> 
     </Style> 
    </Window.Resources> 

    <StackPanel> 
     <TextBlock Visibility="Collapsed" 
        Text="This is going to be the dropdown control." 
        Style="{StaticResource DropDownStyle}"/> 
    </StackPanel> 
</Window>

的風格我爲什麼不能設置的知名度，我可以的背景？

來源

2009-09-14 Edward Tanguay

您正在設置TextBlock的可見性，然後嘗試用樣式覆蓋它。這是行不通的。試試這個：

<Window x:Class="TestCollapsed.Views.MainView" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:c="clr-namespace:TestCollapsed.Commands" 
    Title="Main Window" Height="400" Width="800"> 
    <Window.Resources> 
     <Style x:Key="DropDownStyle" TargetType="TextBlock"> 
      <Setter Property="Visibility" Value="Collapsed"/> 
      <Style.Triggers> 
       <DataTrigger Binding="{Binding ControlType}" Value="dropDown"> 
        <Setter Property="Visibility" Value="Visible"/> 
       </DataTrigger> 
      </Style.Triggers> 
     </Style> 
    </Window.Resources> 

    <StackPanel> 
     <TextBlock Text="This is going to be the dropdown control." 
        Style="{StaticResource DropDownStyle}"/> 
    </StackPanel> 
</Window>

來源

2009-09-14 16:33:48

+10

我不得不做出這樣的錯誤10次才沉沒 – 2009-09-14 17:24:17

是啊，我也一樣。現在，這是我在使用觸發器查看代碼時首先要注意的事情。 – 2009-09-14 17:43:51

這正是問題，謝謝 – 2009-09-15 07:43:21

-1

我有同樣的問題。 @布賴恩的答案是完美的！有錯誤和正確的版本。版本錯誤：

<TextBlock Text="1999-09-09 16:08" VerticalAlignment="Top" Visibility="Collapsed"> 
           <TextBlock.Style> 
            <Style BasedOn="{StaticResource TipTextYellow}" TargetType="TextBlock"> 
             <Style.Triggers> 
              <DataTrigger Binding="{Binding ElementName=Alcohol,Path=IsFocused}" Value="True"> 
               <Setter Property="Visibility" Value="Visible"/> 
              </DataTrigger> 
             </Style.Triggers> 
            </Style> 
           </TextBlock.Style> 
          </TextBlock>

正確的版本：

<TextBlock Text="1999-09-09 16:08" VerticalAlignment="Top"> 
           <TextBlock.Style> 
            <Style BasedOn="{StaticResource TipTextYellow}" TargetType="TextBlock"> 
             <Setter Property="Visibility" Value="Collapsed"/> 
             <Style.Triggers> 
              <DataTrigger Binding="{Binding ElementName=Alcohol,Path=IsFocused}" Value="True"> 
               <Setter Property="Visibility" Value="Visible"/> 
              </DataTrigger> 
             </Style.Triggers> 
            </Style> 
           </TextBlock.Style> 
          </TextBlock>

來源

2016-05-17 01:57:45

如何在DataTrigger中切換TextBlock的可見性？

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