public WorkFile NetDownAutoUpdateFiles(string big, string small, string version)//下载程序
        {
            WorkFile file = new WorkFile();
            string result = HttpClient.DownLoadData(ConfigurationManager.AppSettings["API_AutoUpdateProgram"], new { fileBigType = big, fileSmallType = small, fileVersion = version });//代码后面后
            if (!string.IsNullOrEmpty(result))//若返回的数据不为空，反序列化到类中
            {
                var Msg = JsonHelper.Deserialize<ApiMessage<WorkFile>>(result);
                if (Msg != null)
                {
                    file = Msg.data;
                    if (file != null && !string.IsNullOrEmpty(file.fileNo))
                    {
                        if (HttpClient.HttpDownloadAutoUpdateFile(file.filePath, file.fileName, file.md5))//md5检验
                        {
                            rep.Add(file);
                        }
                        UnitOfWorkFile.Commit();//使用事务，防止下载到一半断网了
                    }
                }
            }
            return file;
        }

public static string DownLoadData(string url, object requestData)//根据url下载，使用post传输，用webclient下载，未转换成类，是json字符串

{
   string ret = string.Empty;
      try
           {
               if (!url.Contains("http"))
           {
               url = string.Format("http://{0}:{1}/{2}/{3}", ConfigurationManager.AppSettings["ApiServerHost"], ConfigurationManager.AppSettings["ApiServerPort"], ConfigurationManager.AppSettings["ApiPrefix"], url);
            }
             using (WebClient client = new WebClient())
           {
               client.Encoding = Encoding.UTF8;
               client.Headers.Add("Accept", "application/json");
               client.Headers.Add("Content-Type", "application/json");
               client.Headers.Add("Timeout", "5000");
               client.Headers.Add("Method", "POST");
               ret = client.UploadString(url, JsonHelper.Serialize(requestData));//下载数据
           }
                  }
catch (Exception ex)
{
}
return ret;
}

        /// <summary>
        /// HTTP下载文件
        /// </summary>
        /// <param name="url">Http相对路径</param>
        /// <param name="fileName">文件名</param>
        /// <returns></returns>
        public static bool HttpDownloadAutoUpdateFile(string url, string fileName, string md5)
        {
            try
            {
                DownFilesPath = AppDomain.CurrentDomain.BaseDirectory + @"DownFiles\";//获取文件基目录
                string filePath = DownFilesPath + fileName;
                using (WebClient client = new WebClient())
                {
                    url = url.Replace("192.168.50.100", ConfigurationManager.AppSettings["ApiServerHost"]);
                    Uri uri = new Uri(string.Format("http://{0}/{1}", url, fileName));
                    client.DownloadFile(uri, filePath); //下载文件到指定目录
                }
                return CheckFileMd5ByFilePath(filePath, md5);//进行md5检验确定下载文件的正确性
            }
            catch (Exception ex)
            { 
                return false;
            }
        }

 /// <summary>
           /// md5校验
           /// </summary>
           /// <param name="FilePath">文件路径</param>
           /// <returns></returns>
        private static bool CheckFileMd5ByFilePath(string FilePath, string RightMd5)
        {
            bool Right = false;
            try
            {
                if (File.Exists(FilePath))
                {
                    using (System.IO.FileStream fileStream = new System.IO.FileStream(FilePath, System.IO.FileMode.Open))//用的本地路径
                    {
                        using (System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider())
                        {
                            byte[] retVal = md5.ComputeHash(fileStream);
                            string filemd5 = string.Join("", retVal.Select(b => b.ToString("x2")).ToList());
                            Right = (filemd5 == RightMd5);
                        }
                        fileStream.Close();
                    }
                }
            }
            catch (Exception ex)
            { 
            }
            return Right;
        }