如何仅使用XAML而不使用任何代码隐藏对ListBox进行排序? [英] How can I sort a ListBox using only XAML and no code-behind?
问题描述
我需要对ListBox
中的字符串进行排序,但是它是由另一个组件通过DataContext
绑定到视图模型的.因此,我无法直接在XAML中实例化视图模型,例如此示例,它使用ObjectDataProvider
.
I need to sort the strings in a ListBox
, but it is bound to the view model by another component via the DataContext
. So I can't directly instantiate the view model in XAML, as in this example, which uses the ObjectDataProvider
.
在我的XAML中:
<ListBox ItemsSource="{Binding CollectionOfStrings}" />
在我的视图模型中:
public ObservableCollection<string> CollectionOfStrings
{
get { return collectionOfStrings; }
}
在另一个组件中:
view.DataContext = new ViewModel();
没有任何代码!因此,使用纯XAML,我将如何对ListBox中的项目进行排序?同样,XAML不拥有视图模型的实例.
There is no code behind! So using purely XAML, how would I sort the items in the ListBox? Again, the XAML doesn't own the instantiation of the view model.
推荐答案
使用 CollectionViewSource
:
<CollectionViewSource x:Key="SortedItems" Source="{Binding CollectionOfStrings}"
xmlns:scm="clr-namespace:System.ComponentModel;assembly=WindowsBase">
<CollectionViewSource.SortDescriptions>
<scm:SortDescription PropertyName="SomePropertyOnYourItems"/>
</CollectionViewSource.SortDescriptions>
</CollectionViewSource>
<ListBox ItemsSource="{Binding Source={StaticResource SortedItems}}"/>
您可能希望将字符串包装在自定义VM类中,以便更轻松地应用排序行为.
You might want to wrap your strings in a custom VM class so you can more easily apply sorting behavior.
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