长时间运行任务的视觉反馈 [英] Visual feedback on long running task

问题描述

我有一个长时间运行的 for-each 循环，想知道是否有一种惯用的方式来添加一些视觉用户反馈，以便用户不会认为应用程序崩溃了.

I have a long running for-each loop, and was wondering if there was a idiomatic way to add some visual user feedback so the user doesn't think the application crashed.

private void btnRunLongRunningTask_Click(object sender, EventArgs e)
{
    foreach(string path in Directory.EnumerateFiles(@"path"), "*.ext", SearchOption.AllDirectories))
    {
        var result = LongRunning.Task(path);
        string resultPath = Manipulate(path);
        // write result to resultPath
    }
}

这可能会有所帮助:任务本身花费的时间并不多，但可能会有很多.

This might help: It isn't so much that the task itself takes long, but there will likely be a lot of them.

关于如何实现这一目标的任何建议?由于我得到了一个目录作为参数，我想我会查找任务将执行的次数，然后相应地更新进度条，在后台工作程序中运行任务和更新代码，注意跨线程访问问题.

Any advice on how I can accomplish this? Since I'm given a directory as argument, I was thinking I'd look up how many times the task will be performed, then update a progressbar accordingly, running the task and the update code in a background worker, watching out for crossthread access issues.

推荐答案

您可以将工作移至 BackgroundWorker 并使用 ReportProgress 方法.

You could move the work to a BackgroundWorker and use the ReportProgress method.

for (i = 0; i < count; i++)
{
    // do work
    worker.ReportProgress((100 * i) / count);
}

private void MyWorker_ProgressChanged(object sender,
    ProgressChangedEventArgs e)
{
    taskProgressBar.Value = Math.Min(e.ProgressPercentage, 100);
}

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