silverlight双击事件处理

首先添加双击处理帮助类：

    public static class DoubleClickHelper
    {
        private const long k_DoubleClickSpeed = 300;
        private const double k_MaxMoveDistance = 10;
        private static long m_LastClickTicks = 0;
        private static Point m_LastPosition;
        private static object m_LastSender;
        /// <summary>
        /// 鼠标双击事件处理。
        /// </summary>
        /// <param name="sender">类型对象</param>
        /// <param name="e">事件数据</param>
        /// <returns>bool</returns>
        public static bool IsDoubleClick(object sender, MouseButtonEventArgs e)
        {
            bool senderMatch = sender.Equals(m_LastSender);
            m_LastSender = sender;
            long clickTicks = DateTime.Now.Ticks;
            Point position = e.GetPosition(null);
            if (senderMatch)
            {
                long elapsedTicks = clickTicks - m_LastClickTicks;
                long elapsedTime = elapsedTicks / TimeSpan.TicksPerMillisecond;
                double distance = position.Distance(m_LastPosition);
                if (elapsedTime <= k_DoubleClickSpeed && distance <= k_MaxMoveDistance)
                {
                    // Double click!
                    m_LastClickTicks = 0;
                    return true;
                }
            }
            // Not a double click
            m_LastClickTicks = clickTicks;
            m_LastPosition = position;
            return false;
        }
        // 获取间距
        private static double Distance(this Point pointA, Point pointB)
        {
            double x = pointA.X - pointB.X;
            double y = pointA.Y - pointB.Y;
            return Math.Sqrt(x * x + y * y);
        }
    }

页面代码：

<sdk:DataGrid MouseLeftButtonUp="dg_MouseLeftButtonUp" ></sdk:DataGrid> 

后台代码这样写：

        private void dg_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            if (dg.SelectedItem != null)
            {
                if (DoubleClickHelper.IsDoubleClick(sender, e))
                {
                    //双击事件处理。。。           
                }
        }