C#对屏幕分辨率的操作

winform应用程序

1.新建Resolution.cs类

using System;
using System.ComponentModel;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace ScreenResolution
{
    public class Resolution
    {
        public int autoWidth = Screen.PrimaryScreen.Bounds.Width;
        public int autoHeight = Screen.PrimaryScreen.Bounds.Height;

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
        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 int dmPositionX;
            public int dmPositionY;
            public int dmDisplayOrientation;
            public int dmDisplayFixedOutput;
            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 short dmBitsPerPel;
            public int dmPelsWidth;
            public int dmPelsHeight;
            public int dmDisplayFlags;
            public int dmDisplayFrequency;
            public int dmICMMethod;
            public int dmICMIntent;
            public int dmMediaType;
            public int dmDitherType;
            public int dmReserved1;
            public int dmReserved2;
            public int dmPanningWidth;
            public int dmPanningHeight;
        }

        // 平台调用的申明
        [DllImport("user32.dll")]
        public static extern int EnumDisplaySettings(string deviceName, int modeNum, ref DEVMODE devMode);
        [DllImport("user32.dll")]
        public static extern int ChangeDisplaySettings(ref DEVMODE devMode, int flags);

        // 控制改变屏幕分辨率的常量
        public const int ENUM_CURRENT_SETTINGS = -1;
        public const int CDS_UPDATEREGISTRY = 0x01;
        public const int CDS_TEST = 0x02;
        public const int DISP_CHANGE_SUCCESSFUL = 0;
        public const int DISP_CHANGE_RESTART = 1;
        public const int DISP_CHANGE_FAILED = -1;

        // 控制改变方向的常量定义
        public const int DMDO_DEFAULT = 0;
        public const int DMDO_90 = 1;
        public const int DMDO_180 = 2;
        public const int DMDO_270 = 3;

        /// <summary>
        /// 修改屏幕分辨率
        /// </summary>
        /// <param name="width">屏幕宽度</param>
        /// <param name="height">屏幕高度</param>
        public void ChangeResolution(int width, int height)
        {
            // 初始化 DEVMODE结构
            DEVMODE devmode = new DEVMODE();
            devmode.dmDeviceName = new String(new char[32]);
            devmode.dmFormName = new String(new char[32]);
            devmode.dmSize = (short)Marshal.SizeOf(devmode);

            if (EnumDisplaySettings(null, ENUM_CURRENT_SETTINGS, ref devmode) != 0)
            {
                devmode.dmPelsWidth = width;
                devmode.dmPelsHeight = height;

                // 改变屏幕分辨率
                int iRet = ChangeDisplaySettings(ref devmode, CDS_TEST);

                if (iRet == DISP_CHANGE_FAILED)
                {
                    MessageBox.Show("不能执行你的请求", "信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                else
                {
                    iRet = ChangeDisplaySettings(ref devmode, CDS_UPDATEREGISTRY);

                    switch (iRet)
                    {
                        // 成功改变
                        case DISP_CHANGE_SUCCESSFUL:
                        {
                            break;
                        }
                        case DISP_CHANGE_RESTART:
                        {
                            MessageBox.Show("你需要重新启动电脑设置才能生效", "信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                            break;
                        }
                        default:
                        {
                            MessageBox.Show("改变屏幕分辨率失败", "信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                            break;
                        }
                    }
                }
            }
        }
    }
}

2.创建窗体

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace ScreenResolution
{
    public partial class Form1 : Form
    {
        Resolution reso;
        public Form1()
        {
            InitializeComponent();
            reso = new Resolution();
        }

        /// <summary>
        /// 修改分辨率
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            int width = Convert.ToInt32(this.comboBox1.SelectedItem.ToString().Split('*')[0]);
            int height = Convert.ToInt32(this.comboBox1.SelectedItem.ToString().Split('*')[1]);
            reso.ChangeResolution(width, height);
        }

        /// <summary>
        /// 还原分辨率
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            reso.ChangeResolution(reso.autoWidth,reso.autoHeight);
        }
    }
}

3.启动测试(选择一项，点击修改分辨率。亲测有效，可还原)