c# 截屏，需要初始化，百分比比例读取

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Windows;

namespace SmartMouse
{
    internal class GetScreen
    {
        public static void InitScreen()
        {
            //return;
            // 获取屏幕对象
            Screen screen = Screen.PrimaryScreen;

            // 获取屏幕的Dpi缩放比例
            //double dpiX = screen.DpiX;
            //double dpiY = screen.DpiY; 
            // 获取屏幕的宽度和高度
            double width = Screen.PrimaryScreen.Bounds.Width;/// 
            width = SystemParameters.PrimaryScreenWidth;
            width = Screen.PrimaryScreen.Bounds.Width;
            double height = Screen.PrimaryScreen.Bounds.Height;// /
            height = SystemParameters.PrimaryScreenHeight;
            height = Screen.PrimaryScreen.Bounds.Height;
            // 获取屏幕大小
            bounds = new Rectangle(0, 0, (int)width, (int)height);

            // 创建一个Bitmap对象并将其设置为屏幕大小

            bitmap = new Bitmap(bounds.Width, bounds.Height);
        }
        static Rectangle bounds;
        static Bitmap bitmap;
        public static Bitmap CaptureScreen()
        {
            try
            {
                // 创建一个Graphics对象并将其设置为bitmap

                Graphics g = Graphics.FromImage(bitmap);
                // 将整个屏幕绘制到Graphics对象中
                g.CopyFromScreen(Point.Empty, Point.Empty, bounds.Size);

                // 将截图保存为文件
                //bitmap.Save("screenshot.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
            }
            catch (Exception)
            {
                //bitmap = null;
            }
            return bitmap;
            //Console.WriteLine("屏幕截图已保存");
        }
    }
}

然后调用

   Image image;
   while (true)
   {
       System.Threading.Thread.Sleep(30);
       image = GetScreen.CaptureScreen();
       pictureBox1.Invoke(new Action(() =>
       {
           pictureBox1.Image = image;
       }));
   }