BackgroundWorker.ReportProgress令人困惑的例子?

BackgroundWorker reportProgress事件的处理方式如下(此示例来自MSDN http://msdn.microsoft.com/en-us/library/cc221403(VS.95).aspx

private void bw_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker worker = sender as BackgroundWorker;

  for (int i = 1; (i <= 10); i++)
  {
    if ((worker.CancellationPending == true))
    {
        e.Cancel = true;
        break;
    }
    else
    {
        // Perform a time consuming operation and report progress.
        // _results.Load() downloads XML and save the data to database
        System.Threading.Thread.Sleep(500);
        worker.ReportProgress((i * 10));
    }
  }
}

我的函数下载XML并在解析后将其保存到数据库中。我在下面调用了这个函数“//执行一个耗时的操作并报告进度。”但是我的函数不会运行10次吗?

后来我修改了Load(),添加了变量CountTotal(结果总数)和CountLoaded(保存的结果数,它会随着函数的进程而改变)。

private void bw_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker worker = sender as BackgroundWorker;

  for (int i = 1; (i <= 10); i++)
  {
    if ((worker.CancellationPending == true))
    {
        e.Cancel = true;
        break;
    }
    else
    {
        // Perform a time consuming operation and report progress.
        _results.Load() downloads XML and save the data to database

        worker.ReportProgress((_results.CountLoaded * 10)); //i did something like this
    }
  }
}

问题是 worker.ReportProgress 完成后执行 _results.Load()