C# 截屏並保存圖片

public void fu_ScreenCut(String strFileName)
        {
            int nWidth, nHeight;    //顯示器寬度、高度

            //獲取顯示器尺寸
            nWidth = Screen.PrimaryScreen.Bounds.Width;
            nHeight = Screen.PrimaryScreen.Bounds.Height;

            Bitmap bit = new Bitmap(nWidth, nHeight);   //實例化一個圖像，尺寸大小爲主顯示器尺寸
            Graphics g = Graphics.FromImage(bit);
            g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
            g.CopyFromScreen(0, 0,0,0 ,new Size(nWidth, nHeight));
            bit.Save(strFileName);

        }