ASP.NET给图片加文字水印

    using System.IO;
    using System.Drawing;
    using System.Drawing.Imaging;
    using System.Drawing.Drawing2D;
    /**//// <summary>
    /// 文字水印处理方法
    /// </summary>
    /// <param name="path">图片路径（绝对路径）</param>
    /// <param name="size">字体大小</param>
    /// <param name="letter">水印文字</param>
    /// <param name="color">颜色</param>
    /// <param name="location">水印位置</param>
    public static string LetterWatermark(string path, int size, string letter, Color color, string location)
    ...{
        string kz_name = Path.GetExtension(path);
        if (kz_name == ".jpg" || kz_name == ".bmp" || kz_name == ".jpeg")
        ...{
            DateTime time = DateTime.Now;
            string filename = "" + time.Year.ToString() + time.Month.ToString() + time.Day.ToString() + time.Hour.ToString() + time.Minute.ToString() + time.Second.ToString() + time.Millisecond.ToString();
            Image img = Bitmap.FromFile(path);
            Graphics gs = Graphics.FromImage(img);
            ArrayList loca = GetLocation(location, img, size, letter.Length);
            Font font = new Font("宋体", size);
            Brush br = new SolidBrush(color);
            gs.DrawString(letter, font, br, float.Parse(loca[0].ToString()), float.Parse(loca[1].ToString()));
            gs.Dispose();
            string newpath = Path.GetDirectoryName(path) + filename + kz_name;
            img.Save(newpath);
            img.Dispose();
            File.Copy(newpath, path, true);
            if (File.Exists(newpath))
            ...{
                File.Delete(newpath);
            }
        }
        return path;
    }

    /**//// <summary>
    /// 文字水印位置的方法
    /// </summary>
    /// <param name="location">位置代码</param>
    /// <param name="img">图片对象</param>
    /// <param name="width">宽(当水印类型为文字时,传过来的就是字体的大小)</param>
    /// <param name="height">高(当水印类型为文字时,传过来的就是字符的长度)</param>
    private static ArrayList GetLocation(string location, Image img, int width, int height)
    ...{
        ArrayList loca = new ArrayList();  //定义数组存储位置
        float x = 10;
        float y = 10;

        if (location == "LT")
        ...{
            loca.Add(x);
            loca.Add(y);
        }
        else if (location == "T")
        ...{
            x = img.Width / 2 - (width * height) / 2;
            loca.Add(x);
            loca.Add(y);
        }
        else if (location == "RT")
        ...{
            x = img.Width - width * height;
        }
        else if (location == "LC")
        ...{
            y = img.Height / 2;
        }
        else if (location == "C")
        ...{
            x = img.Width / 2 - (width * height) / 2;
            y = img.Height / 2;
        }
        else if (location == "RC")
        ...{
            x = img.Width - height;
            y = img.Height / 2;
        }
        else if (location == "LB")
        ...{
            y = img.Height - width - 5;
        }
        else if (location == "B")
        ...{
            x = img.Width / 2 - (width * height) / 2;
            y = img.Height - width - 5;
        }
        else
        ...{
            x = img.Width - width * height;
            y = img.Height - width - 5;
        }
        loca.Add(x);
        loca.Add(y);
        return loca;
    }