无法使用 Azure 应用程序中的 FtpWebRequest 连接到 ftp 服务器答案

【问题标题】：Cannot connect to ftp server with FtpWebRequest from Azure app无法使用 Azure 应用程序中的 FtpWebRequest 连接到 ftp 服务器
【发布时间】：2017-11-03 07:33:38
【问题描述】：

我可以使用本地 asp.net 应用程序将文件上传到 azure ftp 服务器，但是在将应用程序发布到 azure 后无法正常工作，这让我没有登录

这是我连接到 ftp 服务器的代码，但是当部署到 azure 时它不起作用

private void ExecuteRequest(string url, string action, string fileToUpload = null)
    {
        var request = (FtpWebRequest)WebRequest.Create(url);
        request.Method = action;
        request.UseBinary = true;
        request.UsePassive = true;
        request.KeepAlive = true;
        request.Credentials = new NetworkCredential(_settings.Username, _settings.Password);
        WebResponse response = null;
        try
        {
            if (action == WebRequestMethods.Ftp.UploadFile)
            {
                StreamReader sourceStream = new StreamReader(fileToUpload);
                byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
                sourceStream.Close();
                request.ContentLength = fileContents.Length;

                Stream requestStream = request.GetRequestStream();
                requestStream.Write(fileContents, 0, fileContents.Length);
                requestStream.Close();
            }
            response = request.GetResponse();
        }
        catch (WebException exp)
        {
            var ftpResponse = (FtpWebResponse)exp.Response;
            if (request.Method== WebRequestMethods.Ftp.MakeDirectory && ftpResponse.StatusCode != FtpStatusCode.ActionNotTakenFileUnavailable)
                DiosException.Throw(exp);
        }
        finally
        {
            if (response != null)
                response.Close();
        }
    }

【问题讨论】：

标签： c# asp.net .net azure ftp

【解决方案1】：

它应该可以在 Azure WebApp 上运行，我在我这边测试了您的代码，它可以正常运行。以下是我的测试代码。在您的情况下，您可以remote debug the WebApp 获取详细的错误信息。如果我们想了解更多关于 Azure WebApp 的信息，可以参考WebApp Sanbox。

  var fileName = Guid.NewGuid().ToString() + ".txt";
  var url = $"ftp://xxxxx.ftp.azurewebsites.windows.net/site/wwwroot/{fileName}";
  var action = WebRequestMethods.Ftp.UploadFile;
  var request = (FtpWebRequest)WebRequest.Create(url);
  var fileToUpload = @"D:\home\site\wwwroot\tom.txt"; // make sure the file is existing and file can be accessed
  var userName = @"xxxxxx";
  var password = "xxxxxxx";
  request.Method = action;
  request.UseBinary = true;
  request.UsePassive = true;
  request.KeepAlive = true;
  request.Credentials = new NetworkCredential(userName, password);
  WebResponse response = null;
  try
  {
      if (action == WebRequestMethods.Ftp.UploadFile)
       {
          var sourceStream = new StreamReader(fileToUpload);
          byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
          sourceStream.Close();
          request.ContentLength = fileContents.Length;
          var requestStream = request.GetRequestStream();
          requestStream.Write(fileContents, 0, fileContents.Length);
          requestStream.Close();
        }
          response = request.GetResponse();
    }
    catch (WebException exp)
    {
          var ftpResponse = (FtpWebResponse)exp.Response;
          //if (request.Method == WebRequestMethods.Ftp.MakeDirectory && ftpResponse.StatusCode != FtpStatusCode.ActionNotTakenFileUnavailable)
          // DiosException.Throw(exp);
    }
    finally
    {
          response?.Close();
    }

【讨论】：