silverlight datagrid 行双击事件

/*

网上找的例子当双击不为同一行也会执行双击事件。综合了一下，先用这个用着，因为MenuDataGrid_LoadingRow里还有其他自动编号，统计的代码，故MenuDataGrid_LoadingRow会执行多次

缺点   e.Row.MouseLeftButtonUp -= Row_MouseLeftButtonUp;  e.Row.MouseLeftButtonUp += Row_MouseLeftButtonUp;  会执行多次

*/


        private bool m_bFirstTime = true;


        void MenuDataGrid_LoadingRow(object sender, DataGridRowEventArgs e)
        { 
            e.Row.MouseLeftButtonUp -= Row_MouseLeftButtonUp;
            e.Row.MouseLeftButtonUp += Row_MouseLeftButtonUp;
        }

        private void MenuDataGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (MenuDataGrid.SelectedIndex == -1)
            {
                m_bFirstTime = true;
            }
            else
            {
                m_bFirstTime = false;
            }
        }

        private void Row_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            m_bFirstTime = !m_bFirstTime;
            TimeSpan t = DateTime.Now.TimeOfDay;
            if (this.MenuDataGrid.Tag != null)
            {
                TimeSpan oldT = (TimeSpan)this.MenuDataGrid.Tag;
                if ((t != oldT && (t - oldT) < TimeSpan.FromMilliseconds(300)) && !m_bFirstTime)
                {
                    DoubleClick();
                }
            }
            this.MenuDataGrid.Tag = t;
        }


        private void DoubleClick()
        {

            //双击操作，获取SelectItem进行操作
        }