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   源码介绍

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Csharp开发，通过user32中的EnumDisplaySettings方法枚举出当前显示器支持的分辨率和刷新率模式，再通过ChangeDisplaySettings方法设置为需要的模式。初始模式会被保存在DEVMODE的dmPelsWidth、dmPelsHeight、dmDisplayFrequency以及dmBitsPerPel等属性中，点击Restore则恢复到初始状态

代码设置屏幕分辨率

    public class 修改屏幕分辨率
    {



        static int i = Screen.PrimaryScreen.Bounds.Width;

        static int j = Screen.PrimaryScreen.Bounds.Height;

        static int fr = RefreshRate;
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

        public struct DEVMODE
        {

            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]

            public string dmDeviceName;

            public short dmSpecVersion;

            public short dmDriverVersion;

            public short dmSize;

            public short dmDriverExtra;

            public int dmFields;

            public short dmOrientation;

            public short dmPaperSize;

            public short dmPaperLength;

            public short dmPaperWidth;

            public short dmScale;

            public short dmCopies;

            public short dmDefaultSource;

            public short dmPrintQuality;

            public short dmColor;

            public short dmDuplex;

            public short dmYResolution;

            public short dmTTOption;

            public short dmCollate;

            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]

            public string dmFormName;

            public short dmLogPixels;

            public int dmBitsPerPel;

            public int dmPelsWidth;

            public int dmPelsHeight;

            public int dmDisplayFlags;

            public int dmDisplayFrequency;

        }


        [DllImport("user32.dll")]
        public extern static IntPtr GetDesktopWindow();

        [DllImport("user32.dll")]
        public static extern IntPtr GetDC(IntPtr hWnd);


        [DllImport("Gdi32.dll", CharSet=CharSet.Auto, ExactSpelling=true)]
        public static extern int GetDeviceCaps(IntPtr hDC,int nIndex);
        public static int RefreshRate
        {
            get{
                IntPtr desktopDC = GetDC(GetDesktopWindow());
                return GetDeviceCaps(desktopDC,116);
            }
        }


        [DllImport("user32.dll", CharSet = CharSet.Auto)]

        static extern int ChangeDisplaySettings([In] ref DEVMODE lpDevMode, int dwFlags);

        [DllImport("user32.dll", CharSet = CharSet.Auto)]

        static extern bool EnumDisplaySettings(string lpszDeviceName, Int32 iModeNum, ref DEVMODE lpDevMode);



        static public DEVMODE 改变分辨率1()
        {

            DEVMODE DevM = new DEVMODE();


            DevM.dmSize = (short)Marshal.SizeOf(typeof(DEVMODE));

            bool mybool;

            mybool = EnumDisplaySettings(null, 0, ref DevM);

            DevM.dmPelsWidth = 1920;

            DevM.dmPelsHeight = 1080;

            DevM.dmDisplayFrequency = 60;

            DevM.dmBitsPerPel = 32;//颜色象素  

            long result = ChangeDisplaySettings(ref DevM, 0);

            return DevM;

        }

        static public DEVMODE 改变分辨率2()
        {

            DEVMODE DevM = new DEVMODE();

            DevM.dmSize = (short)Marshal.SizeOf(typeof(DEVMODE));

            bool mybool;

            mybool = EnumDisplaySettings(null, 0, ref DevM);

            DevM.dmPelsWidth = 1280;

            DevM.dmPelsHeight = 720;

            DevM.dmDisplayFrequency = 60;

            DevM.dmBitsPerPel = 32;//颜色象素  

            long result = ChangeDisplaySettings(ref DevM, 0);

            return DevM;

        }

        static public DEVMODE 改变分辨率3()
        {

            DEVMODE DevM = new DEVMODE();

            DevM.dmSize = (short)Marshal.SizeOf(typeof(DEVMODE));

            bool mybool;

            mybool = EnumDisplaySettings(null, 0, ref DevM);

            DevM.dmPelsWidth = 3840;

            DevM.dmPelsHeight = 2160;

            DevM.dmDisplayFrequency = 30;

            DevM.dmBitsPerPel = 32;//颜色象素  

            long result = ChangeDisplaySettings(ref DevM, 0);

            return DevM;

        }

        static public DEVMODE 还原分辨率()
        {

            DEVMODE DevM = new DEVMODE();

            DevM.dmSize = (short)Marshal.SizeOf(typeof(DEVMODE));

            bool mybool;

            mybool = EnumDisplaySettings(null, 0, ref DevM);

            DevM.dmPelsWidth = i;//恢复宽  

            DevM.dmPelsHeight = j;//恢复高  

            DevM.dmDisplayFrequency = fr;//刷新频率  

            DevM.dmBitsPerPel = 32;//颜色象素  

            long result = ChangeDisplaySettings(ref DevM, 0);

            return DevM;

        }

        static public DEVMODE 最高模式()
        {
            
            int modenum = 0;
            int maxw=0, maxh=0,mnum_bound=0;
            bool done = false;

            DEVMODE DevM = new DEVMODE();
            DEVMODE[] modelist=new DEVMODE[100];
            while (done=EnumDisplaySettings(null, modenum, ref DevM))
            {
                
                modelist[modenum] = DevM;
                if (DevM.dmPelsWidth * DevM.dmPelsHeight >= maxw*maxh)
                {
                    maxw = DevM.dmPelsWidth;
                    maxh = DevM.dmPelsHeight;
                    mnum_bound = modenum;
                }
                modenum  ;

            }
            return modelist[mnum_bound];

        }


    }