public class ImageData    {        public string imageFilePath { get; set; }        public string tempFilePath { get; set; }    }

ImageData data = new ImageData();        [HttpPost]        public ImageData UploadFile()        {            HttpContext context = HttpContext.Current;            if (context.Request.Files.Count == 0)//判断文件是否存在                return null;            String outFilePath = context.Server.MapPath("~/ImageFile/");            string time = System.DateTime.Now.ToFileTimeUtc().ToString() + "/";            System.IO.Directory.CreateDirectory(outFilePath + time);            string imageFilePath = outFilePath + time + context.Request.Files[0].FileName;            context.Request.Files[0].SaveAs(imageFilePath);            string thumbnailFilePath = outFilePath + time + "temp_" + context.Request.Files[0].FileName;            getImage(imageFilePath, 60, 2, thumbnailFilePath);            data.imageFilePath = "localhost:12380/ImageFile/" + time + context.Request.Files[0].FileName;            data.tempFilePath = "localhost:12380/ImageFile/" + time + "temp_" + context.Request.Files[0].FileName;            return data;        }                /// 
        /// 生成缩略图        /// 
        /// 原始图片文件        /// 质量压缩比        /// 收缩倍数        /// 输出文件名        /// 
     
      成功返回true,失败则返回false
             public static bool getImage(String sourceFile, long quality, int multiple, String outputFile)        {            try            {                long imageQuality = quality;                Bitmap sourceImage = new Bitmap(sourceFile);                ImageCodecInfo myImageCodecInfo = GetEncoderInfo("image/jpeg");                System.Drawing.Imaging.Encoder myEncoder = System.Drawing.Imaging.Encoder.Quality;                EncoderParameters myEncoderParameters = new EncoderParameters(1);                EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, imageQuality);                myEncoderParameters.Param[0] = myEncoderParameter;                float xWidth = sourceImage.Width;                float yWidth = sourceImage.Height;                Bitmap newImage = new Bitmap((int)(xWidth / multiple), (int)(yWidth / multiple));                Graphics g = Graphics.FromImage(newImage);                g.DrawImage(sourceImage, 0, 0, xWidth / multiple, yWidth / multiple);                g.Dispose();                newImage.Save(outputFile, myImageCodecInfo, myEncoderParameters);                return true;            }            catch            {                return false;            }        }                      /// 
        /// 获取图片编码信息        /// 
        private static ImageCodecInfo GetEncoderInfo(String mimeType)        {            int j;            ImageCodecInfo[] encoders;            encoders = ImageCodecInfo.GetImageEncoders();            for (j = 0; j < encoders.Length; ++j)            {                if (encoders[j].MimeType == mimeType)                    return encoders[j];            }                        return null;        }