在进度条达到100％之前触发RunWorkerCompleted

问题描述

我正在做我的第一个WinForms应用程序，该应用程序具有后台工作程序和进度条.当我运行我的代码时，进度条似乎被延迟了，因为当执行RunWorkerCompleted的代码时，它的动画-接近100％-尚未完成. (填充进度条需要几百毫秒.)有没有办法使事情更加同步?

I'm doing my first WinForms application featuring a background worker and progress bar. When I run my code it looks like the progress bar is delayed, because its animation -- approaching 100% -- is not completed when the code for the RunWorkerCompleted is executed. (A few hundred milliseconds the progress bar is filled.)Is there a way to make things more synchronized?

从用户的角度来看，我希望进度条能在其他事情开始发生之前达到100％.

From a user perspective I'm expecting the progress bar to reach 100% before other things start to happen.

componentList.Count通常在5到15之间，这意味着进度动画每个增量大约会跳10-20％.

componentList.Count, below, is usually 5-15, meaning the progress animation jumps roughly 10-20% each increment.

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;
    }

我当前的解决方法，给人以同时性的印象:

My current workaround, giving the impression of simultaneousness:

    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:

使用问题更改值时禁用.NET progressbar动画?"中建议的技巧.通过使用现有的实现，然后添加以下逻辑，我设法解决了问题:

Using the trick suggested in the question "Disabling .NET progressbar animation when changing value?" I managed to solve my problem by using the existing implementation and then adding the following logic:

    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;
        }
    }

推荐答案

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％.

Do a simple trick, instead of solving the UI thread synchronization problem.Simply set progress bar to 100% in _RunWorkerCompleted.

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

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