wpf - TextEdit_KeyDown 事件绑定(bind)到命令

Question

我有一个 TextEdit 和一个像这样的按钮:

<dxe:TextEdit Text="{Binding SearchText}" Width="200" Height="25" VerticalAlignment="Center"  KeyDown="TextEdit_KeyDown" />
<Button Command="{Binding SearchCommand}" VerticalAlignment="Center" Margin="20,0,0,0" >

当用户单击按钮时，SearchCommand 会成功运行并返回结果。当用户按下 时，我希望同样的事情发生输入 .如何将 TextEdit_KeyDown 事件绑定(bind)到命令，以便获得相同的结果。

Answer 1

看看EventToCommand来自 DevExpress MVVM Framework 的行为:

查看:

<UserControl ...
    DataContext="{dxmvvm:ViewModelSource Type=local:SearchViewModel}"> 
    //...
    <dxe:TextEdit Text="{Binding SearchText}" Width="200" Height="25" VerticalAlignment="Center"> 
        <dxmvvm:Interaction.Behaviors> 
            <dxmvvm:EventToCommand EventName="KeyDown" 
                Command="{Binding SearchByKeyCommand}" 
                PassEventArgsToCommand="True"
            > 
        </dxmvvm:Interaction.Behaviors> 
    </dxe:TextEdit>
    <Button Command="{Binding SearchCommand}" VerticalAlignment="Center" Margin="20,0,0,0" >
    //...

查看型号:

[POCOViewModel]
public class SearchViewModel {
    public virtual SearchText { 
       get ; 
       set; 
    }
    public void Search() {
        //...  
    }
    public void SearchByKey(KeyEventArgs) {
        Search();  
    }
    public bool CanSearchByKey(KeyEventArgs args) {
        return (args.KeyCode == Keys.Enter) && !string.IsNullOrEmpty(SearchText);
    }
}