Question

我正在做我的第一个WinForms应用程序，其中包含后台工作程序和进度条。当我运行我的代码时，它看起来像进度条被延迟，因为当执行RunWorkerCompleted的代码时，它的动画 - 接近100％ - 没有完成。（进度条填充几百毫秒。）有没有办法让事情更加同步？

从用户的角度来看，我希望进度条在其他事情开始发生之前达到100％。

下面的componentList.Count通常是5-15，这意味着进度动画每次增加大约10-20％。

我的代码：

    private void ExecuteButton_Click(object sender, EventArgs e)
    {
        ExecuteButton.Enabled = false;
        backgroundWorker1.RunWorkerAsync();
    }

    private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {
        int filesRun = 0;
        foreach(string file in componentList)
        {
            api.ExecuteInstructions(file);
            int progress = ++filesRun * 100 / componentList.Count;
            backgroundWorker1.ReportProgress(progress);
        }
    }

    private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        progressBar1.Value = e.ProgressPercentage;
    }

    void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        ExecuteButton.Enabled = true;
    }

我目前的解决方法，给人一种同步的印象：

    private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {
        int filesRun = 0;
        foreach(string file in componentList)
        {
            api.ExecuteInstructions(file);
            int progress = ++filesRun * 100 / componentList.Count;
            if(progress == 100)
                progress--;

            backgroundWorker1.ReportProgress(progress);
        }

        Thread.Sleep(650); // cosmetic paus
        backgroundWorker1.ReportProgress(100);
    }

更新：

使用“更改值时禁用.NET进度条动画”问题中建议的技巧？我设法通过使用现有的实现来解决我的问题，然后添加以下逻辑：

    private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        progressBar1.Value = e.ProgressPercentage;

        if (e.ProgressPercentage == 100)
        {
            progressBar1.Value = 101;
            progressBar1.Maximum = 100;
            progressBar1.Value = 100;
        }
    }

Answer 1

做一个简单的技巧，而不是解决UI线程同步问题。只需在_RunWorkerCompleted中将进度条设置为100％。

void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
  progressBar1.Value = 100;
  Application.DoEvents();
  ExecuteButton.Enabled = false;
}

在进度条达到100％之前触发RunWorkerCompleted

1 个答案: