wpf CompositeCollection + CollectionContainer：将 CollectionContainer.Collection 绑定到用作 DataTemplates DataType 的 ViewModel 的属性
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/19243109/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
CompositeCollection + CollectionContainer: Bind CollectionContainer.Collection to property of ViewModel that is used as DataTemplates DataType
提问by Oliver
I do not get the correct Binding syntax to access the Catsand Dogsproperties of MyViewModelwithin a DateTemplatethat defines a CompositeCollectionwithin its resources.
我没有获得正确的绑定语法来访问在其资源中定义 a 的a中的Cats和Dogs属性。MyViewModelDateTemplateCompositeCollection
public class MyViewModel
{
public ObservableCollection<Cat> Cats { get; private set; }
public ObservableCollection<Dog> Dogs { get; private set; }
}
<DataTemplate DataType={x:Type local:MyViewModel}">
<DataTemplate.Resources>
<CompositeCollection x:Key="MyColl">
<!-- How can I reference the Cats and Dogs properties of MyViewModel? -->
<CollectionContainer Collection="{Binding Dogs, ????}">
<CollectionContainer Collection="{Binding Cats, ????}">
</CompositeCollection>
</DataTemplate.Resources>
<ListBox ItemsSource="{StaticResource MyColl}">
<!-- ... -->
</ListBox>
</DataTemplate>
What do I have to insert for ???? to bind the Dogsand Catscollections to the CollectionContainers?
我必须插入什么？？？将Dogs和Cats集合绑定到CollectionContainers？
回答by Oliver
Due to the issue with data binding on CollectionContaineras described http://social.msdn.microsoft.com/Forums/vstudio/en-US/b15cbd9d-95aa-47c6-8068-7ae9f7dca88a/collectioncontainer-does-not-support-relativesource?forum=wpfI now use the following approach:
由于数据绑定问题CollectionContainer，如http://social.msdn.microsoft.com/Forums/vstudio/en-US/b15cbd9d-95aa-47c6-8068-7ae9f7dca88a/collectioncontainer-does-not-support-relativesource? forum=wpf我现在使用以下方法：
<ListBox>
<ListBox.Resources>
<CollectionViewSource x:Key="DogCollection" Source="{Binding Dogs}"/>
<CollectionViewSource x:Key="CatCollection" Source="{Binding Cats}"/>
</ListBox.Resources>
<ListBox.ItemsSource>
<CompositeCollection>
<CollectionContainer Collection="{Binding Source={StaticResource DogCollection}}"/>
<CollectionContainer Collection="{Binding Source={StaticResource CatCollection}}"/>
</CompositeCollection>
</ListBox.ItemsSource>
<!-- ... -->
</ListBox>
Edit:The CompositeCollectionclass does not derive from FrameworkElementand thus does not have a DataContextproperty to support data binding. It will only work if you use Bindingproviding a Source. Have a look here https://stackoverflow.com/a/6446923/1254795for more information.
编辑：本CompositeCollection类不从派生FrameworkElement，因此不具有DataContext财产支持数据绑定。仅当您使用Binding提供Source. 看看这里https://stackoverflow.com/a/6446923/1254795了解更多信息。
回答by Nitin
Try giving name to your ListBox and refer its DataContext in binding:
尝试为您的 ListBox 命名并在绑定中引用它的 DataContext：
<ListBox x:Name="myList" ItemsSource="{DynamicResource MyColl}">
<ListBox.Resources>
<CompositeCollection x:Key="MyColl">
<CollectionContainer Collection="{Binding DataContext.Dogs, Source={x:Reference myList}}"/>
<CollectionContainer Collection="{Binding DataContext.Cats, Source={x:Reference myList}}"/>
</CompositeCollection>
</ListBox.Resources>
</ListBox>
