上传图片控件

Code
 public class PictureHelper
    {
        /// <summary>
        /// 上传原图片
        /// </summary>
        /// <param name="fileUploadControlName">上传控件ID</param>
        /// <param name="fileUploadPath">上传文件物理路径</param>
        /// <param name="pictureType">上传文件类型</param>
        /// <param name="strMessage">out 信息</param>
        public static void UploadPicture(FileUpload fileUploadControlName, string fileUploadPath,string pictureType ,out string strMessage)
        {
            strMessage = string.Empty;
            if (fileUploadControlName.HasFile)
            {
                string fileContentType = fileUploadControlName.PostedFile.ContentType;
                if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg")
                {
                    string lastName = ".jpg";
                    string fileUploadName = Guid.NewGuid().ToString("N").ToUpper();
                    string name = fileUploadName + lastName;                        // 客户端文件路径

                    FileInfo file = new FileInfo(name);
                    string fileName = file.Name;                                    // 文件名称

                    if (!Directory.Exists(fileUploadPath))
                    {
                        Directory.CreateDirectory(fileUploadPath);
                    }

                    if (fileUploadControlName.PostedFile.ContentLength > 1024*1000)
                    {
                        strMessage = "提示：文件尺寸过大";
                    }

                    // 原图片保存路径
                    string webFilePath = fileUploadPath + fileName;
                    // 保存原图片
                    fileUploadControlName.SaveAs(webFilePath);

                    switch (pictureType)
                    { 
                        case "Album":
                            break;
                        case "Photo":
                            MakeThumbnail(webFilePath, System.Web.HttpContext.Current.Server.MapPath("~/Upload/Photo/Big/") , fileName, PictureSize.PhotoBigItemWidth, PictureSize.PhotoBigItemHeight);
                            MakeThumbnail(webFilePath, System.Web.HttpContext.Current.Server.MapPath("~/Upload/Photo/Small/") , fileName, PictureSize.PhotoSmallItemWidth, PictureSize.PhotoSmallItemHeight);
                            break;
                        default:
                            break;
                    }

                    #region 测试代码
                    //string fileName_s = "s_" + file.Name;                           // 缩略图文件名称
                    //string fileName_sy = "sy_" + file.Name;                         // 水印图文件名称（文字）
                    //string fileName_syp = "syp_" + file.Name;                       // 水印图文件名称（图片）
                    //string webFilePath = System.Web.HttpContext.Current.Server.MapPath("file/" + fileName);        // 服务器端文件路径
                    //string webFilePath_s = Server.MapPath("file/" + fileName_s);　　// 服务器端缩略图路径
                    //string webFilePath_sy = Server.MapPath("file/" + fileName_sy);　// 服务器端带水印图路径(文字)
                    //string webFilePath_syp = Server.MapPath("file/" + fileName_syp);　// 服务器端带水印图路径(图片)
                    //string webFilePath_sypf = Server.MapPath("file/shuiyin.jpg");　// 服务器端水印图路径(图片)

                    //if (!File.Exists(webFilePath))
                    //{
                    //    try
                    //    {
                    //        fileUploadControlName.SaveAs(webFilePath);                                // 使用 SaveAs 方法保存文件
                    //        //AddShuiYinWord(webFilePath, webFilePath_sy);
                    //        //AddShuiYinPic(webFilePath, webFilePath_syp, webFilePath_sypf);
                    //        MakeThumbnail(webFilePath, webFilePath_s, 130, 130, "Cut");     // 生成缩略图方法
                    //       // Label1.Text = "提示：文件“" + fileName + "”成功上传，并生成“" + fileName_s + "”缩略图，文件类型为：" + FileUpload1.PostedFile.ContentType + "，文件大小为：" + FileUpload1.PostedFile.ContentLength + "B";
                    //    }
                    //    catch (Exception ex)
                    //    {
                    //        //Label1.Text = "提示：文件上传失败，失败原因：" + ex.Message;
                    //    }
                    //}
                    //else
                    //{
                    //    //Label1.Text = "提示：文件已经存在，请重命名后上传";
                    //}
                    #endregion
                }
                else
                {
                    strMessage = "提示：文件类型不符";
                }
            }
        }

        #region 缩略图
        /// <summary>
        /// 生成缩略图 缩放方式
        /// </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="thumbnailName">缩略图路径 名称</param>
        /// <param name="width">缩略图宽度</param>
        /// <param name="height">缩略图高度</param>
        public static void MakeThumbnail(string originalImagePath, string thumbnailPath,string thumbnailName, int width, int height)
        {
            System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);
            
            if (!Directory.Exists(thumbnailPath))
            {
                Directory.CreateDirectory(thumbnailPath);
            }
            thumbnailPath = thumbnailPath + thumbnailName;
            int towidth = width;
            int toheight = height;

            int x = 0;
            int y = 0;
            int ow = originalImage.Width;
            int oh = originalImage.Height;
            // 图片规格符合
            if (ow > width && oh > height)
            {
                if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
                {
                    MakeThumbnail(originalImagePath, thumbnailPath, width, height, "W");
                }
                else
                {
                    MakeThumbnail(originalImagePath, thumbnailPath, width, height, "H");
                }
            }
            // 规格宽
            else if (ow > width)
            {
                MakeThumbnail(originalImagePath, thumbnailPath, width, height, "W");
            }
            // 规格高
            else if (oh > height)
            {
                MakeThumbnail(originalImagePath, thumbnailPath, width, height, "H");
            }
            // 直接保留原图
            else
            {
                MakeThumbnail(originalImagePath, thumbnailPath, width, height, "HW");
            }
        }

        /// <summary>
        /// 生成缩略图具体方法
        /// </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）含图片名称</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>    
        private 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）
                    towidth = ow;
                    toheight = oh;
                    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 加水印
        /// <summary>
        /// 在图片上增加文字水印
        /// </summary>
        /// <param name="Path">原服务器图片路径</param>
        /// <param name="Path_sy">生成的带文字水印的图片路径</param>
        protected static void AddShuiYinWord(string Path, string Path_sy)
        {
            string addText = "测试水印";
            System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
            System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
            g.DrawImage(image, 0, 0, image.Width, image.Height);
            System.Drawing.Font f = new System.Drawing.Font("Verdana", 16);
            System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Blue);

            g.DrawString(addText, f, b, 15, 15);
            g.Dispose();

            image.Save(Path_sy);
            image.Dispose();
        }

        /// <summary>
        /// 在图片上生成图片水印
        /// </summary>
        /// <param name="Path">原服务器图片路径</param>
        /// <param name="Path_syp">生成的带图片水印的图片路径</param>
        /// <param name="Path_sypf">水印图片路径</param>
        protected static void AddShuiYinPic(string Path, string Path_syp, string Path_sypf)
        {
            System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
            System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Path_sypf);
            System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
            g.DrawImage(copyImage, new System.Drawing.Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, System.Drawing.GraphicsUnit.Pixel);
            g.Dispose();

            image.Save(Path_syp);
            image.Dispose();
        }
        #endregion
    }

    /// <summary>
    /// 图像类型
    /// </summary>
    public class PictureType
    {
        public static string Photo = "Photo";
        public static string Album = "Album";
        public static string Pet = "Pet";
    }

    /// <summary>
    /// 图像尺寸设置
    /// </summary>
    public class PictureSize
    {
        public static int PhotoBigItemWidth=300;
        public static int PhotoBigItemHeight=600;

        public static int PhotoSmallItemWidth = 100;
        public static int PhotoSmallItemHeight=100;

        public static int AlbumItemWidth = 200;
        public static int AlbumItemHeight=300;
    }