C# 截屏方式

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

namespace zhuaScreen
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        [System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]
        private static extern bool BitBlt(
         IntPtr hdcDest,                  //目的DC的句柄 
         int nXDest,                        //目的图形的左上角的x坐标 
         int nYDest,                        //目的图形的左上角的y坐标 
         int nWidth,                         //目的图形的矩形宽度 
         int nHeight,                        //目的图形的矩形高度 
         IntPtr hdcSrc,                    //源DC的句柄 
         int nXSrc,                          //源图形的左上角的x坐标 
         int nYSrc,                           //源图形的左上角的x坐标 
         System.Int32 dwRop          //光栅操作代码 
         ); 
        private void button1_Click(object sender, EventArgs e)
        {
            Graphics g1 = this.CreateGraphics();                                                                                      //获得窗体图形对象 
            Image MyImage = new Bitmap(this.ClientRectangle.Width, this.ClientRectangle.Height, g1);
            Graphics g2 = Graphics.FromImage(MyImage);                                                                      //创建位图图形对象 
            IntPtr dc1 = g1.GetHdc();                                                                                                         //获得窗体的上下文设备 
            IntPtr dc2 = g2.GetHdc();                                                                                                           //获得位图文件的上下文设备 
            BitBlt(dc2, 0, 0, this.ClientRectangle.Width, this.ClientRectangle.Height, dc1, 0, 0, 13369376);//写入到位图 
            g1.ReleaseHdc(dc1);                                                                                                                  //释放窗体的上下文设备 
            g2.ReleaseHdc(dc2);                                                                                                                 //释放位图文件的上下文设备 
            MyImage.Save("Captured.jpg", ImageFormat.Jpeg);                                                                //保存为jpeg文件 
            MessageBox.Show("保存图片在同目录下结束！"); 
        }
    }
}