winform窗体运行后全屏显示怎么实现(不是最大化)

winform窗体运行后全屏显示如何实现(不是最大化)
如题

[解决办法]

C# code

/// <summary>/// 设置全屏或这取消全屏/// </summary>/// <param name="fullscreen">true:全屏 false:恢复</param>/// <param name="rectOld">设置的时候，此参数返回原始尺寸，恢复时用此参数设置恢复</param>/// <returns>设置结果</returns>public static bool SetFullScreen(bool fullscreen, ref Rectangle rectOld){    int Hwnd = 0;        Hwnd = FindWindow("Shell_TrayWnd", null);    if (Hwnd == 0) return false;    if (fullscreen)    {        ShowWindow(Hwnd, SW_HIDE);        Rectangle rectFull = Screen.PrimaryScreen.Bounds;        SystemParametersInfo(SPI_GETWORKAREA, 0, ref rectOld, SPIF_UPDATEINIFILE);//get        SystemParametersInfo(SPI_SETWORKAREA, 0, ref rectFull, SPIF_UPDATEINIFILE);//set    }    else    {        ShowWindow(Hwnd, SW_SHOW);        SystemParametersInfo(SPI_SETWORKAREA, 0, ref rectOld, SPIF_UPDATEINIFILE);    }    return true;}[DllImport("user32.dll", EntryPoint = "ShowWindow")]public static extern int ShowWindow(int hwnd, int nCmdShow);public const int SW_SHOW = 5;public const int SW_HIDE = 0;[DllImport("user32.dll", EntryPoint = "SystemParametersInfo")]private static extern int SystemParametersInfo(int uAction, int uParam, ref Rectangle lpvParam, int fuWinIni);public const int SPIF_UPDATEINIFILE = 0x1;public const int SPI_SETWORKAREA = 47;public const int SPI_GETWORKAREA = 48;