Silverlight 5双击始终将ClickCount返回为1

Question

我创建了DataGrid的行为以检测双击:

public class DataGridDoubleClickBehavior : Behavior<DataGrid>    
    {
        public static readonly DependencyProperty CommandParameterProperty = DependencyProperty.Register(
            "CommandParameter",
            typeof(object),
            typeof(DataGridDoubleClickBehavior),
            new PropertyMetadata(null));        

        public object CommandParameter
        {
            get { return GetValue(CommandParameterProperty); }            
            set { SetValue(CommandParameterProperty, value); }
        }

        public static readonly DependencyProperty DoubleClickCommandProperty = DependencyProperty.Register(
            "DoubleClickCommand",
            typeof(ICommand),
            typeof(DataGridDoubleClickBehavior),
            new PropertyMetadata(null));       

        public ICommand DoubleClickCommand
        {
            get { return (ICommand)GetValue(DoubleClickCommandProperty); }            
            set { SetValue(DoubleClickCommandProperty, value); }
        }

        protected override void OnAttached()
        {
            this.AssociatedObject.LoadingRow += this.OnLoadingRow;
            this.AssociatedObject.UnloadingRow += this.OnUnloadingRow;

            base.OnAttached();
        }

        protected override void OnDetaching()
        {
            this.AssociatedObject.LoadingRow -= this.OnLoadingRow;
            this.AssociatedObject.UnloadingRow -= this.OnUnloadingRow;

            base.OnDetaching();
        } 

        private void OnLoadingRow(object sender, DataGridRowEventArgs e)
        {
            e.Row.MouseLeftButtonUp += this.OnMouseLeftButtonUp;
        }

        private void OnUnloadingRow(object sender, DataGridRowEventArgs e)
        {
            e.Row.MouseLeftButtonUp -= this.OnMouseLeftButtonUp;
        }

        private void OnMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            if (e.ClickCount < 2) return;

            if (this.DoubleClickCommand != null) this.DoubleClickCommand.Execute(this.CommandParameter);
        }
    }

一切似乎都很好,除了它没有注册多次点击.OnMouseLeftButtonUp总是在ClickCount中1.有人知道为什么吗？

Answer 1

我发现了一个很简单的解决方案 只需替换事件处理程序注册语法

myDataGrid.MouseLeftButtonDown += this.MyDataGrid_MouseLeftButtonDown;

用AddHandler语法

myDataGrid.AddHandler(DataGrid.MouseLeftButtonDownEvent,
    new MouseButtonEventHandler(this.MyDataGrid_MouseLeftButtonDown),
    handledEventsToo: true)

这样handledEventsToo就可以指定魔法布尔参数.

这也将处理处理事件.

Answer 2

不能 100% 确定这是问题所在，但我注意到 Pete Brown 的示例使用 MouseLeftButtonDown 代替：

http://10rem.net/blog/2011/04/13/silverlight-5-supporting-double-and-even-triple-click-for-the-mouse