private const uint WS_EX_LAYERED = 0x80000;

        private const int WS_EX_TRANSPARENT = 0x20;

        private const int GWL_STYLE = (-);

        private const int GWL_EXSTYLE = (-);

        private const int LWA_ALPHA = ;

        [DllImport("user32", EntryPoint = "SetWindowLong")]

        private static extern uint SetWindowLong(

        IntPtr hwnd,

        int nIndex,

        uint dwNewLong

        );

        [DllImport("user32", EntryPoint = "GetWindowLong")]

        private static extern uint GetWindowLong(

        IntPtr hwnd,

        int nIndex

        );

        [DllImport("user32", EntryPoint = "SetLayeredWindowAttributes")]

        private static extern int SetLayeredWindowAttributes(

        IntPtr hwnd,

        int crKey,

        int bAlpha,

        int dwFlags

        );

　　/// <summary>

　　/// 设置窗体具有鼠标穿透效果

　　/// </summary>

　　/// <param name="flag">true穿透，false不穿透</param>

　　public void SetPenetrate(bool flag = true)

　　{

　　　　uint style = GetWindowLong(this.Handle, GWL_EXSTYLE);

　　　　if (flag)

　　　　　　SetWindowLong(this.Handle, GWL_EXSTYLE, style | WS_EX_TRANSPARENT | WS_EX_LAYERED);

　　　　else

　　　　　　SetWindowLong(this.Handle, GWL_EXSTYLE, style & ~(WS_EX_TRANSPARENT | WS_EX_LAYERED));

　　　　SetLayeredWindowAttributes(this.Handle, , , LWA_ALPHA);

　　}