急急急！！.net 批量上传图片并且加上水印紧急求助！有什么思路请大家帮帮忙，有demo最好不过了.在线等

using System;

using System.Collections;

using System.IO;

using System.Drawing;

using System.Drawing.Imaging;

using System.Drawing.Drawing2D;



namespace SufeiUtil

{

    public class ImageClass

    {

        public ImageClass()

        { }



        #region 缩略图

        /// <summary>

        /// 生成缩略图

        /// </summary>

        /// <param name="originalImagePath">源图路径（物理路径）</param>

        /// <param name="thumbnailPath">缩略图路径（物理路径）</param>

        /// <param name="width">缩略图宽度</param>

        /// <param name="height">缩略图高度</param>

        /// <param name="mode">生成缩略图的方式</param>    

        public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)

        {

            System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);



            int towidth = width;

            int toheight = height;



            int x = 0;

            int y = 0;

            int ow = originalImage.Width;

            int oh = originalImage.Height;



            switch (mode)

            {

                case "HW":  //指定高宽缩放（可能变形）                

                    break;

                case "W":   //指定宽，高按比例                    

                    toheight = originalImage.Height * width / originalImage.Width;

                    break;

                case "H":   //指定高，宽按比例

                    towidth = originalImage.Width * height / originalImage.Height;

                    break;

                case "Cut": //指定高宽裁减（不变形）                

                    if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)

                    {

                        oh = originalImage.Height;

                        ow = originalImage.Height * towidth / toheight;

                        y = 0;

                        x = (originalImage.Width - ow) / 2;

                    }

                    else

                    {

                        ow = originalImage.Width;

                        oh = originalImage.Width * height / towidth;

                        x = 0;

                        y = (originalImage.Height - oh) / 2;

                    }

                    break;

                default:

                    break;

            }



            //新建一个bmp图片

            System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);



            //新建一个画板

            System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);



            //设置高质量插值法

            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;



            //设置高质量,低速度呈现平滑程度

            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;



            //清空画布并以透明背景色填充

            g.Clear(System.Drawing.Color.Transparent);



            //在指定位置并且按指定大小绘制原图片的指定部分

            g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight), new System.Drawing.Rectangle(x, y, ow, oh), System.Drawing.GraphicsUnit.Pixel);



            try

            {

                //以jpg格式保存缩略图

                bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);

            }

            catch (System.Exception e)

            {

                throw e;

            }

            finally

            {

                originalImage.Dispose();

                bitmap.Dispose();

                g.Dispose();

            }

        }

        #endregion



        #region 图片水印

        /// <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;

        }

        #endregion



        #region 文字水印

        /// <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)

        {

            #region



            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;



            #endregion

        }



        /// <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)

        {

            #region



            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 (locati