如何根据 ContentControl 的当前内容的数据类型自动使用数据模板
当我尝试指定多个 DataTemplate 供 ContentControl 使用以便使用正确的 DataTemplate（基于类型）时，我最终得到的 Content 只是 Content 的 ToString() 值。
<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 CurrentlySelectedTreeViewModel 返回 TypeAViewModel 的树节点时，我会看到 MyApp.ViewModel.TypeAViewModel 显示。我希望看到我的 TypeAViewModelUserControl。
我尝试将单个
有什么想法我做错了吗？
（顺便说一句，CurrentlySelectedTreeViewModel 是一个返回 TreeView 中当前选定节点的属性。它似乎工作得很好 - 当我在树中选择节点时，出现节点的正确类型名称 ContentControl）。
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>
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.
I've tried putting a single <TextBlock Text="TESTING"/> element in one of my data templates just to see if the problem was related to my user controls. Same result.
Any ideas what I am doing wrong?
(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).
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x:Type位应位于大括号{}之间：The
x:Typebit should be between curly braces{}:x:Type是一个 MarkupExtension，它需要{}向 XAML 编译器指示。x:Typeis a MarkupExtension, which requires{}to indicate to the XAML compiler.