WPF 从子 ItemsControl 数据模板内部绑定到父 ItemsControl
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WPF Binding to parent ItemsControl from inside of child ItemsControl data template
提问by Robert Petz
I need to be able to bind to a parent ItemsControl's properties from inside of a child ItemsControl data template:
我需要能够ItemsControl从 child ItemsControl 数据模板内部绑定到 parent的属性：
<ItemsControl ItemsSource="{Binding Path=MyParentCollection, UpdateSourceTrigger=PropertyChanged}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<ItemsControl ItemsSource="{Binding Path=MySubCollection}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Path=MyParentCollection.Value, UpdateSourceTrigger=PropertyChanged}"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
Let's assume that MyParentCollection (the outer collection) is of the following type:
让我们假设 MyParentCollection（外部集合）属于以下类型：
public class MyObject
{
public String Value { get; set; }
public List<MyChildObject> MySubCollection { get; set;
}
And let's assume that MyChildObject from the above class is of the following type:
让我们假设来自上述类的 MyChildObject 是以下类型：
public class MyChildObject
{
public String Name { get; set; }
}
How can I bind to MyParentCollection.Value from inside of the inner data template? I can't really use a FindAncestor by type because they both all levels use the same types. I thought maybe I could put a name on the outer collection and use an ElementName tag in the inner binding, but that still couldn't resolve the property.
如何从内部数据模板内部绑定到 MyParentCollection.Value？我不能真正按类型使用 FindAncestor，因为它们所有级别都使用相同的类型。我想也许我可以在外部集合上放置一个名称并在内部绑定中使用 ElementName 标记，但这仍然无法解析该属性。
Any thoughts?
有什么想法吗？
回答by blindmeis
saving the parent item in the tag of the child itemscontrol could work
将父项保存在子项控件的标签中可以工作
<DataTemplate>
<ItemsControl ItemsSource="{Binding Path=MySubCollection}" Tag="{Binding .}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Path=Tag.Value, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</DataTemplate>
its not tested but give you a hint in the right direction :)
它没有经过测试，但会给你一个正确方向的提示:)
回答by ASh
Binding for Tag, as suggested in the other answer, is not required. All data can be obtained from DataContext of ItemControl (and this markup Tag="{Binding}"just copies DataContext into Tag property, which is redundant).
Tag正如另一个答案中所建议的那样，不需要绑定 for 。所有数据都可以从ItemControl的DataContext中获取（而且这个标记Tag="{Binding}"只是将DataContext复制到了Tag属性中，是多余的）。
<ItemsControl ItemsSource="{Binding Path=MyParentCollection}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<ItemsControl ItemsSource="{Binding Path=MySubCollection}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Path=DataContext.Value, RelativeSource={RelativeSource AncestorType=ItemsControl}}"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
