//截取全屏图象         private void btnFullScreen_Click(object sender, EventArgs e)         {             //创建图象，保存将来截取的图象             Bitmap image = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);             Graphics imgGraphics = Graphics.FromImage(image);             //设置截屏区域             imgGraphics.CopyFromScreen(0, 0, 0, 0, new Size(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height));             //保存             SaveImage(image);         } //保存图象文件         private void SaveImage(Image image)         {             if (saveFileDialog.ShowDialog(this) == DialogResult.OK)             {                 string fileName = saveFileDialog.FileName;                 string extension = Path.GetExtension(fileName);                 if (extension == ".jpg")                 {                     image.Save(fileName, ImageFormat.Jpeg);                 }                 else                 {                     image.Save(fileName, ImageFormat.Bmp);                 }             }         }