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 > 0)
                {
                    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 = 0;

                    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 + 2;

                    //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 + 2;
                    //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 + 2;
                    
                        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 - 3 * 2);

                    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;
        }