Silverlight 鼠标双击 事件

<UserControl x:Class="MouseDbClick.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">

    <Grid x:Name="LayoutRoot" Background="White">
        <ListBox Height="100" HorizontalAlignment="Left" Margin="12,12,0,0" Name="lbTest" VerticalAlignment="Top" Width="120" />
    </Grid>
</UserControl>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace MouseDbClick
{
    public partial class MainPage : UserControl,IMouseDbClick
    {

        MouseDbClickHander hander = null;

        public MainPage()
        {
            InitializeComponent();
            hander = new MouseDbClickHander(this);
            lbTest.MouseLeftButtonDown += new MouseButtonEventHandler(lbTest_MouseLeftButtonDown);
            lbTest.MouseLeftButtonUp += new MouseButtonEventHandler(lbTest_MouseLeftButtonUp);
            string[] str = {"a","b","c","d" };
            lbTest.ItemsSource = str;
        }

        void lbTest_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            hander.OnMouseLeftButtonUp(sender, e);
        }

        void lbTest_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            hander.OnMouseLeftButtonDown(sender, e);  
        }

        #region IMouseDbClick 成员

        public void onMouseDbClick(object sender, MouseButtonEventArgs e)
        {
            string msg = lbTest.SelectedItem as string;
            MessageBox.Show(msg);
        }

        #endregion
    }
}

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace MouseDbClick
{
    public interface IMouseDbClick
    {
        void onMouseDbClick(object sender, MouseButtonEventArgs e);
    }
}

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace MouseDbClick
{
    public class MouseDbClickHander
    {

        public DateTime lastClick = DateTime.Now;
        private bool firstClick = false;
        private IMouseDbClick _mouseDbClick;

        // Methods
        public MouseDbClickHander(IMouseDbClick mouseDbclick)
        {
            this._mouseDbClick = mouseDbclick;
        }
        public void OnMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            
        }
        public void OnMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            //UIElement ui = sender as UIElement;
            TimeSpan span = DateTime.Now - lastClick;
            if (span.TotalMilliseconds < 40 || firstClick == false)
            {
                firstClick = true;
                lastClick = DateTime.Now;
            }
            else
            {
                this._mouseDbClick.onMouseDbClick(sender, e);
                firstClick = false;
            }
        }

    }
}