通过线程通过FTP上传大文件 [英] Uploading Large Files via FTP by Threading

问题描述

大家好！



我将大文件上传到FTP时遇到问题。我正在尝试创建一个新线程并以这种方式上传。



这是我到目前为止：

Hi everyone!

I have an issue with uploading large files to FTP. I'm trying to create a new thread and upload it that way.

Here is what I have so far:

private void uploadButton_Click(object sender, EventArgs e)
{
     if (ofd_psUpdate.ShowDialog() == DialogResult.OK)
     {
          thread = new Thread(UploadFile);
          thread.Start();
     }
}

private void UploadFile(object obj)
{
     try
     {                
          FtpWebRequest request = (FtpWebRequest)FtpWebRequest.Create("ftpURL" + ofd_psUpdate.SafeFileName);
          request.Method = WebRequestMethods.Ftp.UploadFile;
          request.Credentials = new NetworkCredential(ftpUserNameTextBox.Text.Trim(), ftpPasswordTextBox.Text.Trim());
          request.UsePassive = true;
          request.UseBinary = true;
          request.KeepAlive = true;

          stream = File.OpenRead(ofd_psUpdate.FileName);
          byte[] buffer = new byte[stream.Length];
          int bytesSize = 0;

          reqStream = request.GetRequestStream();

          while ((bytesSize = stream.Read(buffer, 0, buffer.Length)) > 0)
          {
               reqStream.Write(buffer, 0, bytesSize);
               this.Invoke(new UpdateProgessCallback(this.UpdateProgress), new object[] { reqStream.Length, stream.Length });
          }                
     }
     catch (Exception ex)
     {
          MessageBox.Show("Fail\n\n" + ex.Message);
     }
     finally
     {
          //reqStream.Close();
          //stream.Close();
     }
}

private void UpdateProgress(Int64 BytesRead, Int64 TotalBytes)
{
     // Calculate the download progress in percentages
     PercentProgress = Convert.ToInt32((BytesRead * 100) / TotalBytes);
     // Make progress on the progress bar
     progressBar1.Value = PercentProgress;
     // Display the current progress on the form
     label20.Text = "Uploaded " + BytesRead + " of " + TotalBytes + " (" + PercentProgress + "%)";
}

这应该上传文件并在进度条上显示进度并更新标签也是。



这行代码失败：

this.Invoke（新的UpdateProgessCallback（this.UpdateProgress）， new object [] {reqStream.Length，stream.Length}）;

出现此错误：

此流不支持搜索操作。



之前有没有人见过这个错误？如果是这样，你是如何解决它的。我无法通过谷歌找到解决方案。



谢谢大家！

This is supposed to upload a file and show the progress on a progress bar and update a label with the progress, too.

The code is failing on this line:
this.Invoke(new UpdateProgessCallback(this.UpdateProgress), new object[] { reqStream.Length, stream.Length });
with this error:
This stream does not support seek operations.

Has anyone seen this error before? If so, how did you resolve it. I've not been able to find a resolution for this via google.

Thanks everyone!

推荐答案

我自己解决了。这是我通过FTP查询确定提交成功或失败的文件的方式。

I solved it myself. It was the way I was FTP'ing the file that determined the success or failure of the submission.

这篇关于通过线程通过FTP上传大文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！