【截图】WINFORM中几句程序获取整个屏幕的图片及当前窗口的图片快照

本文参考了【http://blog.csdn.net/johnsuna/article/details/8087483】的内容，自己测试后再上自己的部分理解和注释，仅供参考。

/// <summary>
        /// 截取WinForm控件，本例截取窗体中的【panel1】中的内容;
        /// </summary>
        /// <returns>截取的图片</returns>
        private Image GetWinformImage()
        {
            //定义Bitmap;
            Bitmap bmp = new Bitmap(this.panel1.Width, this.panel1.Height);
            //在指定范围内画出截取到的图片，范围宽度或高度不够则右侧或下侧会显示不完整;
            this.panel1.DrawToBitmap(bmp, new Rectangle(0, 0, this.panel1.Width, this.panel1.Height));
            //bmp.Save("D:\\Job\\T\\1.bmp");

            return b;
        }

/// <summary>
        /// 截取屏幕范围内的内容;
        /// </summary>
        /// <returns>截取的图片</returns>
        private Image GetScreenImage()
        {
            Image image = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
            Graphics g = Graphics.FromImage(image); //将【image】与【Graphics】，可以进行在处理;
            g.CopyFromScreen(new Point(0, 0), new Point(0, 0), Screen.PrimaryScreen.Bounds.Size); //截取;
            g.DrawImage(image, 50, 50, 100, 100); //在指定范围内画出截取到的【整张】图片;
            //image.Save("D:\\Job\\T\\2.bmp");
            g.Dispose(); //释放【Graphics】不解释;

            return image;
        }