从 ItemTemplate 内部绑定到 ItemsControl 的 DataContext [英] Bind to ItemsControl's DataContext from inside an ItemTemplate

问题描述

我有一个 ItemsControl，它的 ItemTemplate DataTemplate 包含一个按钮.我希望按钮上的命令绑定到 ItemsControl 的 DataContext 上的命令，而不是 ItemTemplate.我认为解决方案与使用 RelativeSource 有关，但到目前为止我的尝试都失败了:

I have an ItemsControl whose for the ItemTemplate DataTemplate contains a Button. I want the Command on the button to bind to a Command on the DataContext of the ItemsControl, not the ItemTemplate. I think the solution has to do with using RelativeSource, but my attempts so far have failed:

<ItemsControl ItemsSource="{Binding Games}">        
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <Button Command="{Binding Path=GameSelectedCommand, Source={RelativeSource FindAncestor, AncestorType={x:Type ItemsControl}}}" 
                    CommandParameter="{Binding}" 
                    Style="{StaticResource MenuButtonStyle}" 
                    Content="{Binding Name}"/>    
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>

如何让 Button 绑定到 ItemsControl 的 DataContext 对象的 GameSelectedCommand?

How can I get the Button to bind to the GameSelectedCommand of the ItemsControl's DataContext object?

推荐答案

您正在将绑定源设置为 ItemsControl 本身.因此，您需要取消引用 ItemsControl 的 DataContext:

You're setting the source of the binding to the ItemsControl itself. Therefore, you'll need to dereference the DataContext of the ItemsControl:

Command="{Binding DataContext.GameSelectedCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ItemsControl}}}"

你怎么知道的?运行应用程序时查看您的调试输出窗口.您将看到一条消息，内容为无法解析类型 'ItemsControl' 上的属性 'GameSelectedCommand'".

How would you have known this? Take a look at your debug output window when running the app. You'll see a message along the lines of "Cannot resolve property 'GameSelectedCommand' on type 'ItemsControl'".

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