跑在BackgroundWorker的一种方法和进度显示 [英] Running a method in BackGroundWorker and Showing ProgressBar

问题描述

我要当一些方法做一些任务UI是自己保持活跃，我要显示在进度条的工作进展情况。

What I want is when some method is doing some task UI keeps itself active and I want to show the progress of the work in a progress-bar.

我有一个方法，一个BackgroundWorker和进度。我想调用方法时，后台工作开始运行并显示进度。该方法包含循环。因此，它可以报告的进展。

I have a method, a BackGroundWorker and a progressbar. I want to call the method when background worker starts running and show the progress. The method contains a loop. So, it can report the progress.

那么，什么可以做？

private void Form1_Load(object sender, EventArgs e)
{
    // TODO: This line of code loads data into the 'dataSet1.TBLMARKET' table. You can move, or remove it, as needed.
    myBGWorker.WorkerReportsProgress = true;
}

private void myBGWorker_DoWork(object sender, DoWorkEventArgs e)
{
    parseFiles();
}

private void myBGWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
    myProgressBar.Value = e.ProgressPercentage;
}

private void myBGWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    MessageBox.Show("Done");
}

private void parseButton_Click(object sender, EventArgs e)
{
    myBGWorker.RunWorkerAsync();
}

public void parseFiles()
{
  for()
  {
     //parsing
     myBGWorker.ReportProgress(...);
  }
}

但它不工作。进度条没有更新。只有一小部分进展在MessageBox后显示完成。

But it's not working. The progressbar is not updating. Only a small progress is showing after the MessageBox "Done".

推荐答案

而不是使用一个ParseFiles方法（它应该取决于myBGWorker）使用循环和方法，解析一个文件中。在这个循环报告进度百分比：

Instead of using one ParseFiles method (which should depend on myBGWorker) use loop and method which parse one file. Report progress percentage in that loop:

private void parseButton_Click(object sender, EventArgs e)
{
    parseButton.Enabled = false;
    myBGWorker.RunWorkerAsync();
}

private void myBGWorker_DoWork(object sender, DoWorkEventArgs e)
{
   for(int i = 0; i < filesCount; i++)
   {  
       ParseSingleFile(); // pass filename here
       int percentage = (i + 1) * 100 / filesCount;
       myBGWorker.ReportProgress(percentage);
   }
}

void myBGWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
    myProgressBar.Value = e.ProgressPercentage;
}

void myBGWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    parseButton.Enabled = true;
    MessageBox.Show("Done");
}

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