在asp.net中為圖像加入水印信息

using System.Drawing;using System.IO;using System.Drawing.Imaging;        PRivate void AddTextToImg(string fileName,string text)        {            if(!File.Exists(MapPath(fileName)))            {                throw new FileNotFoundException("The file don't exist!");            }                        if( text == string.Empty )            {                return;            }            //還需要判斷文件類型是否為圖像類型，這里就不贅述了            System.Drawing.Image image = System.Drawing.Image.FromFile(MapPath(fileName));            Bitmap bitmap = new Bitmap(image,image.Width,image.Height);            Graphics g = Graphics.FromImage(bitmap);            float fontSize = 12.0f;             //字體大小            float textWidth = text.Length*fontSize;  //文本的長度            //下面定義一個矩形區域，以后在這個矩形里畫上白底黑字            float rectX = 0;                    float rectY = 0;            float rectWidth = text.Length*(fontSize+8);            float rectHeight = fontSize+8;            //聲明矩形域            RectangleF textArea = new RectangleF(rectX,rectY,rectWidth,rectHeight);            Font font = new Font("宋體",fontSize);   //定義字體            Brush whiteBrush = new SolidBrush(Color.White);   //白筆刷，畫文字用            Brush blackBrush = new SolidBrush(Color.Black);   //黑筆刷，畫背景用            g.FillRectangle(blackBrush,rectX,rectY,rectWidth,rectHeight);                        g.DrawString(text,font,whiteBrush,textArea);            MemoryStream ms = new MemoryStream( );            //保存為Jpg類型            bitmap.Save(ms,ImageFormat.Jpeg);            //輸出處理后的圖像，這里為了演示方便，我將圖片顯示在頁面中了            Response.Clear();            Response.ContentType = "image/jpeg";            Response.BinaryWrite( ms.ToArray() );            g.Dispose();            bitmap.Dispose();            image.Dispose();        }

調用時很簡單，AddTextToImg("me.jpg","程序人生http://www.manong123.com/");一切OK了，感覺.net確實好強大，這些功能在Asp中可是奢侈品了，而在.Net環境中卻能輕而易舉的完成！