窗体穿透效果

        private const uint WS_EX_LAYERED = 0x80000;
        private const int WS_EX_TRANSPARENT = 0x20;
        private const int GWL_EXSTYLE = (-20);
        private string Var_genre = "";//记录当前操作的类型

        #region 在窗口结构中为指定的窗口设置信息
        /// <summary>
        /// 在窗口结构中为指定的窗口设置信息
        /// </summary>
        /// <param name="hwnd">欲为其取得信息的窗口的句柄</param>
        /// <param name="nIndex">欲取回的信息</param>
        /// <param name="dwNewLong">由nIndex指定的窗口信息的新值</param>
        /// <returns></returns>
        [DllImport("user32", EntryPoint = "SetWindowLong")]
        private static extern uint SetWindowLong(IntPtr hwnd, int nIndex, uint dwNewLong);
        #endregion

        #region 从指定窗口的结构中取得信息
        /// <summary>
        /// 从指定窗口的结构中取得信息
        /// </summary>
        /// <param name="hwnd">欲为其获取信息的窗口的句柄</param>
        /// <param name="nIndex">欲取回的信息</param>
        /// <returns></returns>
        [DllImport("user32", EntryPoint = "GetWindowLong")]
        private static extern uint GetWindowLong(IntPtr hwnd, int nIndex);
        #endregion

        #region 使窗口有鼠标穿透功能
        /// <summary>
        /// 使窗口有鼠标穿透功能
        /// </summary>
        private void CanPenetrate()
        {
            uint intExTemp = GetWindowLong(this.Handle, GWL_EXSTYLE);
            uint oldGWLEx = SetWindowLong(this.Handle, GWL_EXSTYLE, WS_EX_TRANSPARENT | WS_EX_LAYERED);
        }
        #endregion