wpf 如何仅使用 XAML 而没有代码隐藏对 ListBox 进行排序?

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时间:2020-09-08 20:50:33  来源:igfitidea点击:

How can I sort a ListBox using only XAML and no code-behind?

wpfxamlsortingmvvmlistbox

提问by Eben Geer

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.

我需要对 a 中的字符串进行排序ListBox,但它通过DataContext. 所以我不能直接在 XAML 中实例化视图模型,就像在这个例子中一样,它使用ObjectDataProvider.

In my XAML:

在我的 XAML 中:

<ListBox ItemsSource="{Binding CollectionOfStrings}" />

In my view model:

在我的视图模型中:

public ObservableCollection<string> CollectionOfStrings
{
    get { return collectionOfStrings; }
}

In another component:

在另一个组件中:

view.DataContext = new ViewModel();

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.

后面没有代码!那么使用纯粹的 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化。

回答by Kent Boogaart

Use a CollectionViewSource:

使用CollectionViewSource

<CollectionViewSource x:Key="SortedItems" Source="{Binding CollectionOfStrings}"
    xmlns:scm="clr-namespace:System.ComponentModel;assembly=Win??dowsBase">
    <CollectionViewSource.SortDescriptions>
        <scm:SortDescription PropertyName="SomePropertyOnYourItems"/>
    </CollectionViewSource.SortDescriptions>
</CollectionViewSource>

<ListBox ItemsSource="{Binding Source={StaticResource SortedItems}}"/>

You might want to wrap your strings in a custom VM class so you can more easily apply sorting behavior.

您可能希望将字符串包装在自定义 VM 类中,以便您可以更轻松地应用排序行为。