#region 图片缩放      /// <summary>        /// 图片缩放      /// </summary>      /// <param name="savePath">图片相对路径</param>      /// <param name="fileName">图片名称</param>      /// <param name="destWidth">缩放宽度</param>      /// <param name="destHeight">高度</param>       /// <param name="type">1--固定缩放；2--按比例缩放；3--指定宽度,宽度大于指定宽度按指定宽度进行等比缩放，小于指定宽度按原图大小上传；4--原图直接上传</param>       /// <returns></returns>        public static void ReducesPic(string savePath,string fileName, int destWidth, int destHeight, int type)        {            if (!fileName.Equals(""))            {                string Allpath = System.Web.HttpContext.Current.Server.MapPath("/") + savePath;                //生成原图                 System.IO.Stream stream = System.IO.File.OpenRead(Allpath + fileName);                System.Drawing.Image oImage = System.Drawing.Image.FromStream(stream);                stream.Close();                stream.Dispose();                System.Drawing.Image.GetThumbnailImageAbort callb = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);                string fileType = fileName.Substring(fileName.LastIndexOf(".") + 1);                int oWidth = oImage.Width;                int oHeight = oImage.Height;                int tWidth = destWidth; //设置缩略图初始宽度                 int tHeight = destHeight; //设置缩略图初始高度                //按指定宽高缩放                if (type == 1)                {                    tWidth = destWidth;                    tHeight = destHeight;                }                //按比例计算出缩略图的宽度和高度                 else if (type == 2)                {                    if (oWidth > tWidth || oHeight > tHeight)                    {                        if (oWidth >= oHeight)                        {                            tHeight = (int)Math.Floor(Convert.ToDouble(oHeight) * (Convert.ToDouble(tWidth) / Convert.ToDouble(oWidth)));                        }                        else                        {                            tWidth = (int)Math.Floor(Convert.ToDouble(oWidth) * (Convert.ToDouble(tHeight) / Convert.ToDouble(oHeight)));                        }                    }                    else                    {                        tWidth = oWidth; //原图宽度                         tHeight = oHeight; //原图高度                    }                }                //指定宽度,宽度大于指定宽度按指定宽度进行等比缩放，小于指定宽度按原图大小上传                else if (type == 3)                {                    if (oWidth >= tWidth)                    {                        if (oWidth >= oHeight)                        {                            tHeight = (int)Math.Floor(Convert.ToDouble(oHeight) * (Convert.ToDouble(tWidth) / Convert.ToDouble(oWidth)));                        }                        else                        {                            tWidth = (int)Math.Floor(Convert.ToDouble(oWidth) * (Convert.ToDouble(tHeight) / Convert.ToDouble(oHeight)));                        }                    }                    else                    {                        tWidth = oWidth; //原图宽度                         tHeight = oHeight; //原图高度                    }                }                else                {                    tWidth = oWidth; //原图宽度                     tHeight = oHeight; //原图高度                }                //生成缩略原图                 oImage = oImage.GetThumbnailImage(tWidth, tHeight, callb, IntPtr.Zero);                oImage.Save(Allpath+fileName);            }                  }        public static bool ThumbnailCallback() { return false; }        #endregion