c#实现winform屏幕截图并保存的例子

using System.Runtime.InteropServices;
using System.Drawing.Imaging;
[System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]
private static extern bool BitBlt(
IntPtr hdcDest, // 目标 DC的句柄
int nXDest,
int nYDest,
int nWidth,
int nHeight,
IntPtr hdcSrc, // 源DC的句柄
int nXSrc,
int nYSrc,
System.Int32 dwRop // 光栅的处理数值
);
private void button1_Click(object sender, System.EventArgs e)
{
//获得当前屏幕的大小
Rectangle rect = new Rectangle ( ) ;
rect = Screen.GetWorkingArea ( this ) ;
//创建一个以当前屏幕为模板的图象
Graphics g1 = this.CreateGraphics ( ) ;
//创建以屏幕大小为标准的位图
Image MyImage = new Bitmap ( rect.Width , rect.Height , g1 ) ;
Graphics g2 = Graphics.FromImage ( MyImage ) ;
//得到屏幕的DC
IntPtr dc1 = g1.GetHdc ( ) ;
//得到Bitmap的DC
IntPtr dc2 = g2.GetHdc ( ) ;
//调用此API函数，实现屏幕捕获
BitBlt ( dc2 , 0 , 0 , rect.Width , rect.Height , dc1 , 0 , 0 , 13369376 ) ;
//释放掉屏幕的DC
g1.ReleaseHdc ( dc1 ) ;
//释放掉Bitmap的DC
g2.ReleaseHdc ( dc2 ) ;
//以JPG文件格式来保存
MyImage.Save ( @"c:/Capture.jpg" , ImageFormat.Jpeg );
MessageBox.Show ( "当前屏幕已经保存为C盘的capture.jpg文件！" ) ;
}