/// <summary>  /// 文件生成方式  /// </summary>  public class UpFileMessage  {    /// <summary>    /// 文件名    /// </summary>    public string OriginalFileName { get; set; }    /// <summary>    /// 是否保存略縮圖    /// </summary>    public bool IsImage { get; set; }    /// <summary>    /// 文件流    /// </summary>    public Stream FileStream { get; set; }    /// <summary>    /// 生成縮略圖的方式    /// [WH]-指定寬高    /// [H]-指定高，按比例縮放寬    /// [W]-指定寬，按比例縮放高    /// </summary>    public string Mode { get; set; }    /// <summary>    /// 略縮圖高度    /// </summary>    public int? ThumbHeight { get; set; }    /// <summary>    /// 略縮圖寬度    /// </summary>    public int? ThumbWidth { get; set; }  }

/// <summary>  /// 文件上傳返回結果  /// </summary>  public class UpFileResultMessage  {    /// <summary>    /// 文件保存是否成功    /// </summary>    public bool IsSuccess { get; set; }    /// <summary>    /// 錯誤消息    /// </summary>    public string Message { get; set; }    /// <summary>    /// 原始文件名-（無擴展名）    /// </summary>    public string FileName { get; set; }    /// <summary>    /// 文件名擴展名    /// </summary>    public string FileSuffix { get; set; }    /// <summary>    /// 文件名保存路徑    /// </summary>    public string FilePath { get; set; }    /// <summary>    /// 文件類型為圖片時    /// 縮略圖保存路徑    /// </summary>    public string ThumbPath { get; set; }    /// <summary>    /// 保存文件名（無擴展名）    /// </summary>    public string SaveFileName { get; set; }    /// <summary>    /// 文件自增ID    /// </summary>    public int[] FileIdArray { get; set; }  }

public class FileUtil : System.Web.UI.Page  {    /// <summary>    /// 圖片上傳    /// </summary>    /// <param name="fileMessage">文件生成方式</param>    /// <returns></returns>    public UpFileResultMessage UpLoadFile(UpFileMessage fileMessage)    {      try      {        string now = DateTime.Today.ToString("yyyyMMdd");        string guid = Guid.NewGuid().ToString();        //獲取文件擴展名        var fileSuffix = Path.GetExtension(fileMessage.OriginalFileName);        var uploadFolder = Path.Combine(System.Web.HttpContext.Current.Server.MapPath(ParmsConfig.UpFilePathUrl), now);        if (!Directory.Exists(uploadFolder))        {          Directory.CreateDirectory(uploadFolder);        }        //保存文件名        string saveFileName = guid + fileSuffix;        string filePath = Path.Combine(uploadFolder, saveFileName);        UpFileResultMessage upFileResult = new UpFileResultMessage()        {          IsSuccess = true,          FileName = Path.GetFileNameWithoutExtension(fileMessage.OriginalFileName),          FileSuffix = fileSuffix,          FilePath = string.Format(@"{0}/{1}", ParmsConfig.UpFileIPAddressUrl, now),          SaveFileName = guid        };        using (Stream sourceStream = fileMessage.FileStream)        {          using (FileStream targetStream = new FileStream(filePath, FileMode.Create, FileAccess.Write, FileShare.None))          {            const int bufferLen = 1024 * 4;//4KB            byte[] buffer = new byte[bufferLen];            int count = 0;            while ((count = sourceStream.Read(buffer, 0, bufferLen)) > 0)            {              targetStream.Write(buffer, 0, count);            }          }          //上傳文件為圖片時,需創建縮略圖          if (fileMessage.IsImage)          {            var uploadThumbFolder = Path.Combine(uploadFolder, "Thumb");            if (!Directory.Exists(uploadThumbFolder))            {              Directory.CreateDirectory(uploadThumbFolder);            }            using (FileStream targetStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.None))            {              System.Drawing.Image image = System.Drawing.Image.FromStream(targetStream);              int width = image.Width;              int height = image.Height;              int thumbWidth = 0;              int thumbHeight = 0;              switch (fileMessage.Mode)              {                case "WH": //指定高寬縮放（可能變形）                   thumbWidth = fileMessage.ThumbWidth.HasValue ? fileMessage.ThumbWidth.Value : 200;                  thumbHeight = fileMessage.ThumbHeight.HasValue ? fileMessage.ThumbHeight.Value : 200;                  break;                case "W":  //指定寬，高按比例                     thumbWidth = fileMessage.ThumbWidth.HasValue ? fileMessage.ThumbWidth.Value : 200;                  thumbHeight = height * thumbWidth / width;                  break;                case "H":  //指定高，寬按比例                  thumbHeight = fileMessage.ThumbHeight.HasValue ? fileMessage.ThumbHeight.Value : 200;                  thumbWidth = width * thumbHeight / height;                  break;                default:                  thumbWidth = fileMessage.ThumbWidth.HasValue ? fileMessage.ThumbWidth.Value : 200;                  thumbHeight = height * thumbWidth / width;                  break;              }              string thumbFilePath = Path.Combine(uploadThumbFolder, saveFileName);              CreateThumbnail(thumbFilePath, targetStream, thumbWidth, thumbHeight);              upFileResult.ThumbPath = string.Format(@"{0}/{1}/Thumb", ParmsConfig.UpFileIPAddressUrl, now);            }          }        }        return upFileResult;      }      catch (Exception ex)      {        return new UpFileResultMessage() { IsSuccess = false, Message = ex.Message };      }    }    /// <summary>    /// 創建指定圖片文件流的縮略圖    /// </summary>    /// <param name="thumbFilePath">縮略圖文件保存路徑</param>    /// <param name="fileStream">原始文件流</param>    /// <param name="width">縮略圖寬</param>    /// <param name="height">縮略圖高</param>    private void CreateThumbnail(string thumbFilePath, Stream fileStream, int width, int height)    {      using (Image image = Image.FromStream(fileStream))      {        using (Image thumbnail = image.GetThumbnailImage(width, height, null, IntPtr.Zero))        {          thumbnail.Save(thumbFilePath);        }      }    }  }

var upFileMsg = new UpFileMessage()          {            IsImage = true,            OriginalFileName = platformImg[i].FileName,            FileStream = platformImg[i].InputStream,            ThumbWidth = ThumbWidth,            Mode = "W"          };         var  upFileResultMsg = new FileUtil().UpLoadFile(upFileMsg);