如何处理MVVM中的ComboBox SelectionChanged？ [英] How do you handle a ComboBox SelectionChanged in MVVM?

问题描述

对于那些做纯MVVM的人来说，如何处理ComboBox SelectionChanged事件而不需要后退代码？

For those doing pure MVVM, how do you handle a ComboBox SelectionChanged event without reverting to code behind?

AttachedBehaviors ，但不支持Event =SelectedChanged ：

I tried e.g. AttachedBehaviors but Event="SelectedChanged" is not supported:

<ComboBox>
    <ComboBoxItem Content="Test1">
        <c:CommandBehaviorCollection.Behaviors>
            <c:BehaviorBinding Event="SelectionChanged" 
                               Command="{Binding SelectedChanged}"
                               CommandParameter="MainBorder123"/>
        </c:CommandBehaviorCollection.Behaviors>
    </ComboBoxItem>
    <ComboBoxItem Content="Test2"/>
    <ComboBoxItem Content="Test3"/>
</ComboBox>

推荐答案

您将使用数据触发器触发事件一个不同的UI元素，如启用/禁用，或可见/不可见

You would use a data trigger to trigger an event on a different UI element such as "enable / disable, or visible /invisible"

如果您希望所选元素在其他UI元素中显示对象数据，那么您将使用数据绑定，并将要绑定到组合框中当前选定项目的UI数据显示元素的数据文本设置。

If you want the selected element to show the object data in other UI elements then you would use data binding and set the datacontext of the UI data display elements to be bound to the currently selected item in the combo box.

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