ASP.NET给图片加图片水印

    using System.IO;
    using System.Drawing;
    using System.Drawing.Imaging;
    using System.Drawing.Drawing2D;
    /**//// <summary>
    /// 图片水印处理方法
    /// </summary>
    /// <param name="path">需要加载水印的图片路径（绝对路径）</param>
    /// <param name="waterpath">水印图片（绝对路径）</param>
    /// <param name="location">水印位置（传送正确的代码）</param>
    public static string ImageWatermark(string path, string waterpath, 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);
            Image waterimg = Image.FromFile(waterpath);
            Graphics g = Graphics.FromImage(img);
            ArrayList loca = GetLocation(location, img, waterimg);
            g.DrawImage(waterimg, new Rectangle(int.Parse(loca[0].ToString()), int.Parse(loca[1].ToString()), waterimg.Width, waterimg.Height));
            waterimg.Dispose();
            g.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>
    /// 图片水印位置处理方法
    /// </summary>
    /// <param name="location">水印位置</param>
    /// <param name="img">需要添加水印的图片</param>
    /// <param name="waterimg">水印图片</param>
    private static ArrayList GetLocation(string location, Image img, Image waterimg)
    ...{
        ArrayList loca = new ArrayList();
        int x = 0;
        int y = 0;

        if (location == "LT")
        ...{
            x = 10;
            y = 10;
        }
        else if (location == "T")
        ...{
            x = img.Width / 2 - waterimg.Width / 2;
            y = img.Height - waterimg.Height;
        }
        else if (location == "RT")
        ...{
            x = img.Width - waterimg.Width;
            y = 10;
        }
        else if (location == "LC")
        ...{
            x = 10;
            y = img.Height / 2 - waterimg.Height / 2;
        }
        else if (location == "C")
        ...{
            x = img.Width / 2 - waterimg.Width / 2;
            y = img.Height / 2 - waterimg.Height / 2;
        }
        else if (location == "RC")
        ...{
            x = img.Width - waterimg.Width;
            y = img.Height / 2 - waterimg.Height / 2;
        }
        else if (location == "LB")
        ...{
            x = 10;
            y = img.Height - waterimg.Height;
        }
        else if (location == "B")
        ...{
            x = img.Width / 2 - waterimg.Width / 2;
            y = img.Height - waterimg.Height;
        }
        else
        ...{
            x = img.Width - waterimg.Width;
            y = img.Height - waterimg.Height;
        }
        loca.Add(x);
        loca.Add(y);
        return loca;
    }