命名空间：

using System.Drawing; 
using System.Drawing.Imaging; 
using System.Windows.Forms;

相关代码

   //获得当前屏幕的分辨率 
            Screen scr = Screen.PrimaryScreen; 
            Rectangle rc = scr.Bounds; 
 int iWidth = rc.Width;  

 int iHeight = rc.Height;

                //创建一个和屏幕一样大的Bitmap 
            Image myImage = new Bitmap(iWidth, iHeight);

                //从一个继承自Image类的对象中创建Graphics对象

            Graphics g = Graphics.FromImage(myImage);

                //抓屏并拷贝到myimage里 
            g.CopyFromScreen(new Point(0, 0), new Point(0, 0), new Size(iWidth, iHeight)); 
                //保存为文件 
            myImage.Save(@"c:/1.jpeg");

本文转自today4king博客园博客，原文链接：http://www.cnblogs.com/jinzhao/archive/2009/10/12/1581752.html，如需转载请自行联系原作者