Rest文件上传

文件上传时传过来一个stream

代码如下：

  /// <summary>
         /// 上传文件
         /// </summary>
         /// <param name="fileName">文件名</param>
         /// <param name="fileStream">文件流</param>
         /// <returns></returns>
         public ResponseType<int> UploadFile(string projectId, string DocId, string LastModifier, Stream fileStream)
         {
             ResponseType<int> result = new ResponseType<int>();
             string Path = string.Empty;
             try
             {
                 if (fileStream == null)
                 {
                     throw new Exception("没有上传文件");
                 }
                 string relativePath = fileInfoBLL.GetFilePath(projectId, DocId);
                 Path = System.IO.Path.Combine(filePath, relativePath);
                 string fileName = fileInfoBLL.SaveFie(Path, fileStream);

                 FilesInfo filesInfo = new FilesInfo();
                 filesInfo.DocManageId = Convert.ToInt32(DocId);
                 filesInfo.FileName = fileName;
                 filesInfo.FilePath = System.IO.Path.Combine(relativePath, fileName);
                 filesInfo.IsChecked = false;
                 filesInfo.LastmodifiedDateTime = DateTime.Now;
                 filesInfo.LastModifier = LastModifier;
                 filesInfo.ProjectId = Convert.ToInt32(projectId);
                 int fileId = fileInfoBLL.SaveFileInfo(filesInfo);
                 if (fileId > )
                 {
                     result.IsSuccess = true;
                     result.ErrorMessage = "文件保存成功！";
                     result.Value = fileId;
                 }
             }

             catch (Exception ex)
             {

                 ExceptionHandler.ExceptionHelper.Instance.HandleException(ex);
                 result.IsSuccess = false;
                 result.ErrorMessage = "文件保存失败！";
             }

             return result;
         }

黄色部分为真正文件上传代码：

    /// <summary>
         /// 保存文件
         /// </summary>
         /// <param name="relatePath">文件保存的路径</param>
         /// <param name="fileSteam">文件流</param>
         public string SaveFie(string relatePath, Stream fileSteam)
         {
             string fileName = string.Empty;
             try
             {

                 if (!Directory.Exists(relatePath))  //判断文件目录
                 {
                     Directory.CreateDirectory(relatePath);
                 }              

                 using (var ms = new MemoryStream())
                 {
                     fileSteam.CopyTo(ms);
                     ms.Position = ;

                     var encoding = Encoding.UTF8;
                     var reader = new StreamReader(ms, encoding);
                     var headerLength = 0L;

                     //读取第一行
                     var firstLine = reader.ReadLine();
                     //计算偏移（字符串长度+回车换行2个字符）
                     headerLength += encoding.GetBytes(firstLine).LongLength + ;

                     //读取第二行
                     var secondLine = reader.ReadLine();
                     //计算偏移（字符串长度+回车换行2个字符）
                     headerLength += encoding.GetBytes(secondLine).LongLength + ;
                     //解析文件名  

                     fileName = new System.Text.RegularExpressions.Regex("filename=\"(?<fn>.*)\"").Match(secondLine).Groups["fn"].Value;

                     //一直读到空行为止
                     while (true)
                     {
                         //读取一行
                         var line = reader.ReadLine();
                         //若到头，则直接返回
                          if (line == null )

                             break;
                         //若未到头，则计算偏移（字符串长度+回车换行2个字符）
                          headerLength += encoding.GetBytes(line).LongLength + ;

                         if (string.IsNullOrEmpty(line))
                             break;
                     }

                     //设置偏移，以开始读取文件内容
                     ms.Position = headerLength;
                     ////减去末尾的字符串：“\r\n--\r\n”
                     ms.SetLength(ms.Length - encoding.GetBytes(firstLine).LongLength -  * );

                     using (var fileToupload = new FileStream(System.IO.Path.Combine(relatePath,fileName), FileMode.Create))
                     {
                         ms.CopyTo(fileToupload);
                         fileToupload.Close();
                         fileToupload.Dispose();
                     }
                 }
             }
             catch (Exception ex)
             {
                 ExceptionHandler.ExceptionHelper.Instance.HandleException(ex);
             }

             return fileName;
         }