如何暂停和恢复一个BackgroundWorker？ [英] How to pause and resume a BackgroundWorker?

问题描述

这是我做到了在我的代码：
在BackgroundWorker的DoWork的事件我所做的：

This is how i did it in my code: In the backgroundworker dowork event i did:

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            _busy.WaitOne();
                this.Invoke(new MethodInvoker(delegate { label2.Text = "Website To Crawl: "; }));
                this.Invoke(new MethodInvoker(delegate { label4.Text = mainUrl; }));
                webCrawler(mainUrl, levelsToCrawl, e);


        }

然后在暂停按钮单击事件我所做的：

Then in the pause button click event i did:

private void button4_Click(object sender, EventArgs e)
        {
            _busy.Reset();
        }

在简历按钮单击事件我所做的：

In the resume button click event i did:

private void button5_Click(object sender, EventArgs e)
        {
            _busy.Set();
        }

但其不工作当我点击启动流程：

But its not working when i click to start the process:

private void button1_Click(object sender, EventArgs e)
        {
            backgroundWorker1.RunWorkerAsync();
            button1.Enabled = false;
            this.Text = "Processing...";
            label6.Text = "Processing...";
            label6.Visible = true;
            button2.Enabled = false;
            checkBox1.Enabled = false;
            checkBox2.Enabled = false;
            numericUpDown1.Enabled = false;
            button3.Enabled = true;
        }

就只是当我点击恢复按钮，然后在过程开始时，我点击发生暂停按钮没有发生。

Nothing happen only when i click the resume button the process start then when i click the pause button nothing happen.

我想，当我clcik启动过程按钮，它会点击暂停按钮，它会暂停和恢复按钮时启动BackgroundWorker的定期再它会恢复。

I want that when i clcik the start process button it will start the backgroundworker regular then when clicking the pause button it will pause and the resume button it will resume.

我做了什么错？谁能解决我的代码？

What did i do wrong ? Can someone fix my code ?

推荐答案

在您的BackgroundWorker的线程代码，你需要找到安全的地方暂停执行。 ManualResetEvent的是编写正确的方式。这等后期可能会帮助：
有什么办法？无限期暂停线程

In your BackgroundWorker thread code, you need to find places that are safe to "pause" execution. The ManualResetEvent is the right way to code. This other post might help: Is there a way to indefinitely pause a thread?

基本上，在几个点选择在你的工作线程的代码要让它暂停，请尝试将：

Basically, in a few choice points in your worker thread code where you want to allow it to pause, try inserting:

_busy.WaitOne(Timeout.Infinite);

而当要暂停（从你的主线程）使用：

And when you want to pause (from your main thread) you use:

_busy.Reset();

和恢复：

_busy.Set();

这篇关于如何暂停和恢复一个BackgroundWorker？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！