不能通过DataTrigger设置的ContentTemplate [英] Unable to set ContentTemplate via DataTrigger

问题描述

我要的的ContentTemplate 按照价值来改变 DataTrigger 。结果
是的，我认为使用 DataTemplateSelector ，但现在我需要一个 DataTrigger 或更好说了 MultiDataTrigger 。

请看看下面的示例应用程序中，的DataTemplate 并没有改变：

 ＆LT;窗​​口x：类=窗口1
    的xmlns =htt​​p://schemas.microsoft.com/winfx/2006/xaml/$p$psentation
    的xmlns：X =htt​​p://schemas.microsoft.com/winfx/2006/xaml
    的xmlns：SRC =CLR的命名空间：WpfApplication1＆GT;
    ＆LT;＆StackPanel的GT;
        ＆LT;复选框器isChecked ={结合BoolProperty，的RelativeSource = {的RelativeSource FindAncestor，AncestorType = {X：类型SRC：窗口1}}}CONTENT =BoolProperty/＆GT;
        ＆LT; ContentControl中CONTENT ={结合BoolProperty，的RelativeSource = {的RelativeSource FindAncestor，AncestorType = {X：类型SRC：窗口1}}}＆GT;
            ＆LT; ContentControl.ContentTemplate＆GT;
                ＆LT;＆DataTemplate的GT;
                    ＆LT;复选框器isChecked ={结合BoolProperty，的RelativeSource = {的RelativeSource FindAncestor，AncestorType = {X：类型SRC：窗口1}}}CONTENT =模板1/＆GT;
                ＆LT; / DataTemplate中＆GT;
            ＆LT; /ContentControl.ContentTemplate>
            ＆LT; ContentControl.Resources＆GT;
                ＆LT;的DataTemplate X：键=则Template2＆GT;
                    ＆LT;复选框器isChecked ={结合BoolProperty，的RelativeSource = {的RelativeSource FindAncestor，AncestorType = {X：类型SRC：窗口1}}}CONTENT =模板2/＆GT;
                ＆LT; / DataTemplate中＆GT;
            ＆LT; /ContentControl.Resources>
            ＆LT; ContentControl.Style＆GT;
                ＆LT;风格的TargetType =ContentControl中＆GT;
                    ＆LT; Style.Triggers＆GT;
                        ＆LT; D​​ataTrigger绑定={结合BoolProperty，的RelativeSource = {的RelativeSource FindAncestor，AncestorType = {X：类型SRC：窗口1}}}VALUE =真＆GT;
                            ＆LT; setter属性=的ContentTemplateVALUE ={StaticResource的则Template2}/＆GT;
                        ＆LT; / DataTrigger＆GT;
                    ＆LT; /Style.Triggers>
                ＆LT; /样式和GT;
            ＆LT; /ContentControl.Style>
        ＆LT; / ContentControl中＆GT;
        ＆LT;按钮名称=btnSwitchCONTENT =开关/＆GT;
    ＆LT; / StackPanel的＆GT;
＆LT; /窗GT;
 

---

部分类窗口1
    公共财产BoolProperty（）为布尔
        得到
            返回的GetValue（BoolPropertyProperty）
        到底得的
        设置（BYVAL值作为布尔）
            的SetValue（BoolPropertyProperty，值）
        结束设定
    高端物业
    公共共享只读BoolPropertyProperty作为的DependencyProperty = DependencyProperty.Register（BoolProperty的GetType（布尔）的GetType（窗口1），新FrameworkPropertyMetadata（假））    私人小组btnSwitch_Click（BYVAL发件人为System.Object的，BYVAL E上System.Windows.RoutedEventArgs）处理btnSwitch.Click
        BoolProperty =不BoolProperty
    结束小组
末级


解决方案

下面的东西，对我的作品：

 ＆LT; ContentControl中CONTENT ={结合SomeBool}＆GT;
  ＆LT; ContentControl.Resources＆GT;
    ＆LT;的DataTemplate X：键=PinkTemplate＆GT;
      ＆LT; TextBlock的文本={结合}后台=粉红/＆GT;
    ＆LT; / DataTemplate中＆GT;
    ＆LT;的DataTemplate X：键=LimeTemplate＆GT;
      ＆LT; TextBlock的文本={结合}后台=石灰/＆GT;
    ＆LT; / DataTemplate中＆GT;
  ＆LT; /ContentControl.Resources>
  ＆LT; ContentControl.ContentTemplate＆GT;
    ＆LT;＆DataTemplate的GT;
      ＆LT; ContentControl中名称=CC
                      CONTENT ={结合}
                      的ContentTemplate ={StaticResource的PinkTemplate}/＆GT;
      ＆LT; D​​ataTemplate.Triggers＆GT;
        ＆LT; D​​ataTrigger绑定={结合}VALUE =真＆GT;
          ＆LT;二传手的TargetName =CC
                  属性=的ContentTemplate
                  VALUE ={StaticResource的LimeTemplate}/＆GT;
        ＆LT; / DataTrigger＆GT;
      ＆LT; /DataTemplate.Triggers>
    ＆LT; / DataTemplate中＆GT;
  ＆LT; /ContentControl.ContentTemplate>
＆LT; / ContentControl中＆GT;
 

请注意，我的DataTemplate中是另外一个ContentControl中，这使得我的DataTemplate.Triggers就这一（嵌套）ContentControl中的操作的ContentTemplate

I want the ContentTemplate to vary according to the value in the DataTrigger.
And yes, I considered using a DataTemplateSelector, but now I need a DataTrigger or better said a MultiDataTrigger.

Please take a look at the following sample app, the DataTemplate doesn't change:

<Window x:Class="Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:src="clr-namespace:WpfApplication1">
    <StackPanel>
        <CheckBox IsChecked="{Binding BoolProperty, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type src:Window1}}}" Content="BoolProperty"/>
        <ContentControl Content="{Binding BoolProperty, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type src:Window1}}}">
            <ContentControl.ContentTemplate>
                <DataTemplate>
                    <CheckBox IsChecked="{Binding BoolProperty, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type src:Window1}}}" Content="Template 1"/>
                </DataTemplate>
            </ContentControl.ContentTemplate>
            <ContentControl.Resources>
                <DataTemplate x:Key="Template2">
                    <CheckBox IsChecked="{Binding BoolProperty, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type src:Window1}}}" Content="Template 2"/>
                </DataTemplate>
            </ContentControl.Resources>
            <ContentControl.Style>
                <Style TargetType="ContentControl">
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding BoolProperty, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type src:Window1}}}" Value="True">
                            <Setter Property="ContentTemplate" Value="{StaticResource Template2}"/>
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </ContentControl.Style>
        </ContentControl>
        <Button Name="btnSwitch" Content="Switch"/>
    </StackPanel>
</Window>

---

Partial Class Window1
    Public Property BoolProperty() As Boolean
        Get
            Return GetValue(BoolPropertyProperty)
        End Get
        Set(ByVal value As Boolean)
            SetValue(BoolPropertyProperty, value)
        End Set
    End Property
    Public Shared ReadOnly BoolPropertyProperty As DependencyProperty = DependencyProperty.Register("BoolProperty", GetType(Boolean), GetType(Window1), New FrameworkPropertyMetadata(False))

    Private Sub btnSwitch_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles btnSwitch.Click
        BoolProperty = Not BoolProperty
    End Sub
End Class

解决方案

Here's something that works for me:

<ContentControl Content="{Binding SomeBool}">
  <ContentControl.Resources>
    <DataTemplate x:Key="PinkTemplate">
      <TextBlock Text="{Binding}" Background="Pink" />
    </DataTemplate>
    <DataTemplate x:Key="LimeTemplate">
      <TextBlock Text="{Binding}" Background="Lime" />
    </DataTemplate>
  </ContentControl.Resources>
  <ContentControl.ContentTemplate>
    <DataTemplate>
      <ContentControl Name="cc"
                      Content="{Binding}"
                      ContentTemplate="{StaticResource PinkTemplate}" />
      <DataTemplate.Triggers>
        <DataTrigger Binding="{Binding}" Value="True">
          <Setter TargetName="cc" 
                  Property="ContentTemplate"
                  Value="{StaticResource LimeTemplate}" />
        </DataTrigger>
      </DataTemplate.Triggers>
    </DataTemplate>
  </ContentControl.ContentTemplate>
</ContentControl>

Note that my DataTemplate is another ContentControl, which allows my DataTemplate.Triggers to operate on the ContentTemplate of that (nested) ContentControl.

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