如何实现在C＃中的进度条？ [英] How do I implement a progress bar in C#?

问题描述

我如何在C＃中实现一个进度条和BackgroundWorker的数据库调用？

How do I implement a progress bar and backgroundworker for database calls in C#?

我有一个处理大量数据的一些方法。他们是相对长期运行的操作，所以我想实现一个进度条，让用户知道什么是实际发生的事情。

I do have some methods that deal with large amounts of data. They are relatively long running operations, so I want to implement a progress bar to let the user know that something is actually happening.

我想用进度栏或状态带标签的，但因为有一个单一的UI线程，其中数据库，交易方法的执行线程，UI控件不更新，使进度栏或状态带标签是没有用的给我。

I thought of using progress bar or status strip label, but since there is a single UI thread, the thread where the database-dealing methods are executed, UI controls are not updated, making the progress bar or status strip label are useless to me.

我已经看到了一些例子，但他们处理的for循环，例如：

I've already seen some examples, but they deal with for-loops, ex:

for(int i = 0; i < count; i++)
{ 
    System.Threading.Thread.Sleep(70);
    // ... do analysis ...
    bgWorker.ReportProgress((100 * i) / count);
}

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

我在寻找更好的例子。

I'm looking for better examples.

推荐答案

有些人可能不喜欢它，但是这是我做的：

Some people may not like it, but this is what I do:

private void StartBackgroundWork() {
    if (Application.RenderWithVisualStyles)
        progressBar.Style = ProgressBarStyle.Marquee;
    else {
        progressBar.Style = ProgressBarStyle.Continuous;
        progressBar.Maximum = 100;
        progressBar.Value = 0;
        timer.Enabled = true;
    }
    backgroundWorker.RunWorkerAsync();
}

private void timer_Tick(object sender, EventArgs e) {
    if (progressBar.Value < progressBar.Maximum)
        progressBar.Increment(5);
    else
        progressBar.Value = progressBar.Minimum;
}

选取框风格需要VISUALSTYLES被启用，但是它连续滚动自身无需进行更新。我利用它来进行数据库操作不报告进度。

The Marquee style requires VisualStyles to be enabled, but it continuously scrolls on its own without needing to be updated. I use that for database operations that don't report their progress.

这篇关于如何实现在C＃中的进度条？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！