如何基于ContentControl当前内容的数据类型自动使用DataTemplate [英] How to Automatically Use a DataTemplate Based on ContentControl's Current Content's DataType

问题描述

当我尝试指定一个ContentControl使用多个DataTemplate以便使用正确的（基于Type）一个DataTemplate时，我最终得到的Content只是Content的ToString（）值。

When I attempt to specify multiple DataTemplates for use by a ContentControl so that the correct one (based on Type) is used, I end up with Content that is simply the Content's ToString() value.

<ContentControl DataContext="{Binding MyTreeRootViewModels}" Content="{Binding /, Path=CurrentlySelectedTreeViewModel}">
  <ContentControl.Resources>
     <DataTemplate DataType="x:Type vm:TypeAViewModel">
        <StackPanel>
           <local:TypeAUserControl />
           </StackPanel>
     </DataTemplate>

     <DataTemplate DataType="x:Type vm:TypeBViewModel">
        <StackPanel>
           <local:TypeBUserControl />
        </StackPanel>
     </DataTemplate>
  </ContentControl.Resources>
</ContentControl>

在上面的示例中，当我看到一个TypeAViewModel的树节点时，会显示 MyApp.ViewModel.TypeAViewModel由CurrentSelectedTreeViewModel返回。我希望看到我的TypeAViewModelUserControl。

In the example above I would see "MyApp.ViewModel.TypeAViewModel" displayed when a tree node of TypeAViewModel is returned by CurrentlySelectedTreeViewModel. I expect to see my TypeAViewModelUserControl.

我尝试放置一个< TextBlock Text = TESTING />我的一个DataTemplates元素中的元素只是为了查看问题是否与我的用户控件有关。结果相同。

I've tried putting a single <TextBlock Text="TESTING"/> element in one of my DataTemplates just to see if the problem was related to my user controls. Same result.

有什么想法我做错了吗？

Any ideas what I am doing wrong?

（顺便说一下，CurrentlySelectedTreeViewModel是一个属性，它返回树视图中当前选定的节点。它似乎工作得很好-当我在树中选择节点时，该节点的正确类型名称将显示为ContentControl。）

(By the way, the CurrentlySelectedTreeViewModel is a property that returns the currently selected node in my treeview. It seems to work just fine - as I select nodes in the tree, the correct type name for the node appears ContentControl).

推荐答案

x：Type 位应该在花括号 {} 之间：

The x:Type bit should be between curly braces {}:

<DataTemplate DataType="{x:Type vm:TypeAViewModel}">

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