如何将 WPF 控件的内容绑定到其容器的 DataContext，以便我可以基于该对象应用 DataTemplateSelector？

发布于 2024-10-18 06:11:40 字数 849 浏览 6 评论 0原文

我正在尝试将 WPF 窗口绑定到包含两个集合 A 和 B 的 ViewModel 之上。我正在尝试使用 DataTemplates 根据 ViewModel 中标志的设置来显示 A 或 B。

为此，我设置了窗口的 DataContext = ViewModel。但是，当我尝试将 ContentControl 绑定到该 DataContext 并向其应用 DataTemplateSelector 时，选择器的 SelectTemplate 的 item 参数（对象项，DependencyObject 容器） 方法始终为 null：

<Window [snip] Title="MainWindow">
    <Window.Resources>
        <!-- DataTemplate and Selector declarations -->
    </Window.Resources>
    <Grid>
        <ContentControl Content="{Binding}"              
                        ContentTemplateSelector="{StaticResource templateSelector}" />
    </Grid>    
</Window>

我应该如何绑定该 ContentControl 以便将 Window 的 ViewModel 传递到其 DataTemplateSelector？

原文

I'm trying to bind a WPF window atop a ViewModel that contains two collections, A and B. I'm attempting to use DataTemplates to display either A or B depending on the setting of a flag in my ViewModel.

To that end, I've set the window's DataContext = ViewModel. However, when I attempt to bind a ContentControl to that DataContext and apply a DataTemplateSelector to it, the item parameter of the selector's SelectTemplate(object item, DependencyObject container) method is always null:

<Window [snip] Title="MainWindow">
    <Window.Resources>
        <!-- DataTemplate and Selector declarations -->
    </Window.Resources>
    <Grid>
        <ContentControl Content="{Binding}"              
                        ContentTemplateSelector="{StaticResource templateSelector}" />
    </Grid>    
</Window>

How should I be binding that ContentControl such that the Window's ViewModel will be passed through to its DataTemplateSelector?

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聽兲甴掵 2024-10-25 06:11:40

这对我有用：

<ContentControl Content="{Binding DataContext, RelativeSource={RelativeSource Self}}"              
                    ContentTemplateSelector="{StaticResource templateSelector}" />

编辑：

不过我同意亚伦的观点，这可能不是完成任务的最佳方式。你说你正在使用 ViewModel。最简单的方法可能是将 ItemsControl 绑定到 Viewmodel 上公开所需集合的新“SelectedCollection”属性。然后在您的标志中（假设它是一个属性）您可以为“SelectedCollection”触发 propertychanged。

this worked for me:

<ContentControl Content="{Binding DataContext, RelativeSource={RelativeSource Self}}"              
                    ContentTemplateSelector="{StaticResource templateSelector}" />

Edit:

I agree with Aaron though, that this might not be the best way to accomplish things. You said you're using a ViewModel. The easiest way would probably be to bind your ItemsControl to a new "SelectedCollection" property on your Viewmodel that exposes the wanted collection. Then in your flag (assuming it is a property) you can fire propertychanged for "SelectedCollection".

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