C#背景工人问题

时间:2017-02-01 20:11:16

标签: c# background worker sharp

我有一个程序可以下载文件,然后在基于Windows的计算机上替换旧文件。

每当按下按钮下载文件时,我都有两个后台工作程序。一个后台工作人员负责实际执行新文件的SFTP下载。另一个后台工作者每秒只读取下载的文件大小以确定下载进度。

我遇到的问题是,在半数机器上,下载进度不会显示。下载仍在继续。我无法理解为什么在两台计算机上运行相同的程序,下载进度将显示在一台计算机上,但不会显示在另一台计算机上。

 // This thread will handle monitoring the downloaded BioR.mdb file size
    private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {           
        BackgroundWorker worker = sender as BackgroundWorker; // necessary

        do // continue reporting file size until the file has finished downloading
        {
            Thread.Sleep(1000); // report once per second

            long file_size = new FileInfo(@"C:\BioERemote\BioR.mdb").Length; // get file size
            worker.ReportProgress(Convert.ToInt32(file_size)); // "worker" reports the file size to ProgressChanged event
        } while (!is_complete); // is_complete becomes true when backgroundworker2 completes the download          
    }

    private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        label2.Text = Convert.ToString(Math.Round((Convert.ToDouble(e.ProgressPercentage) / Convert.ToDouble(remote_size)) * 100.0, 2)) + "% Downloaded";
    }

    private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        label2.Text = "";
    }

    private void backgroundWorker2_DoWork(object sender, DoWorkEventArgs e)
    {
        using (var client = new SftpClient(sftp_address, sftp_username, sftp_password))
        {
            client.Connect();
            DownloadDirectory(client, bioe_remote_source, local_remote_destination);
            client.Disconnect();
        }

        is_complete = true;
    }

    private void backgroundWorker2_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {            
        label_Status.ForeColor = Color.Green;
        label_Status.Text = "Completed! You may use Remote.";
    }        

2 个答案:

答案 0 :(得分:1)

Ivan Stoev得到了答案。我需要在FileInfo.Length语句周围添加一个try catch语句。

他最初写道:

  

你确定backgroundWorker1_DoWork没有以异常结束吗?对于   实例,如果这行long file_size = new   的FileInfo(@" C:\ BioERemote \ BioR.mdb&#34)。长度;抛出。

答案 1 :(得分:-1)

我首先确保.NET的版本在计算机上是最新的。