WPF：在DataTemplate中处理MouseDown事件

我有以下数据模板：

<DataTemplate x:Key="demoDataTemplate" DataType="models:SomeClass">
        <TextBlock Text="{Binding Path=SomeTextProperty}" MouseDown="{Binding HOWTO????}" />
</DataTemplate>

---

我在ListView中使用此DataTemplate。如何将MouseDown事件绑定到ViewModel中分配给ListView的DataContext的方法？

创建处理鼠标单击的附加属性，如下所示

public class MouseClick
{
    public static readonly DependencyProperty MouseLeftClickProperty = 
        DependencyProperty.RegisterAttached("MouseLeftClick", typeof(ICommand), typeof(MouseClick),
        new FrameworkPropertyMetadata(CallBack));

    public static void SetMouseLeftClick(DependencyObject sender, ICommand value)
    {
        sender.SetValue(MouseLeftClickProperty, value);
    }

    public static ICommand GetMouseLeftClick(DependencyObject sender)
    {
        return sender.GetValue(MouseLeftClickProperty) as ICommand;
    }

    public static readonly DependencyProperty MouseEventParameterProperty =
        DependencyProperty.RegisterAttached(
        "MouseEventParameter",
            typeof(object),
            typeof(MouseClick),
            new FrameworkPropertyMetadata((object)null, null));


    public static object GetMouseEventParameter(DependencyObject d)
    {
        return d.GetValue(MouseEventParameterProperty);
    }


    public static void SetMouseEventParameter(DependencyObject d, object value)
    {
        d.SetValue(MouseEventParameterProperty, value);
    }

    private static void CallBack(DependencyObject sender, DependencyPropertyChangedEventArgs e)
    {
        if (sender != null)
        {
            UIElement element = sender as UIElement;
            if (element != null)
            {
                if (e.OldValue != null)
                {
                    element.RemoveHandler(UIElement.MouseDownEvent, new MouseButtonEventHandler(Handler));
                }
                if (e.NewValue != null)
                {
                    element.AddHandler(UIElement.MouseDownEvent, new MouseButtonEventHandler(Handler), true);
                }
            }
        }
    }
    private static void Handler(object sender, EventArgs e)
    {
        UIElement element = sender as UIElement;
        if (sender != null)
        {
            ICommand cmd = element.GetValue(MouseLeftClickProperty) as ICommand;
            if (cmd != null)
            {
                RoutedCommand routedCmd =cmd as RoutedCommand;
                object paramenter = element.GetValue(MouseEventParameterProperty);
                if (paramenter == null)
                {
                    paramenter = element;
                }
                if (routedCmd != null)
                {
                    if (routedCmd.CanExecute(paramenter, element))
                    {
                        routedCmd.Execute(paramenter, element);
                    }
                }
                else
                {
                    if (cmd.CanExecute(paramenter))
                    {
                        cmd.Execute(paramenter);
                    }
                }
            }
        }
    }
}

在您的Xmal中，更改如下

<DataTemplate x:Key="demoDataTemplate" DataType="models:SomeClass">
    <TextBlock Text="{Binding Path=SomeTextProperty}" local:MouseClick.MouseLeftClick="{Binding Click}"/>
</DataTemplate>

---

其中local是定义MouseClick类的名称空间，Click是ViewModel中的ICommand属性

如何定义您的

ViewModel

？它是在

StaticResources

中还是设置在code-behind中？您使用的是code-behind还是

MVVM

（model，view，viewmodel）？我使用的是MVVM。无论如何，我无法对MouseDown事件使用CodeBehind，因为我想在不同的ListView上重用DataTemplate。但我使用代码隐藏来分配viewmodel—类似listview.DataContext=new MyViewModel（）@user1130329在这种情况下，我建议使用

命令

。这是一个让你开始的方法！您可以从文章中下载源代码（单击下载选项卡）。我喜欢使用自定义的

AttachedCommandBehavior

，它允许您将大多数事件绑定到

DataContext

中的命令。您可以在中查看此示例代码。在您的情况下，不要忘记设置绑定到

列表视图的
ElementName
或
RelativeSource
，因为它的
DataContext
包含您的命令而不是单个项