线程池及线程带参数

最新推荐文章于 2025-05-18 19:58:54 发布

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最新推荐文章于 2025-05-18 19:58:54 发布

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分类专栏： winfrom

本文链接：https://blog.youkuaiyun.com/shang_111111/article/details/9140005

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本文介绍了一种利用C#中的多线程技术实现批量下载指定范围内的网页的方法。通过创建不同的线程来并行处理多个下载任务，提高了下载效率。文中详细展示了如何启动线程、处理下载过程中的异常以及如何在主线程中接收子线程的状态更新。

后台代码:

        private void button1_Click(object sender, EventArgs e)
        {
            ParameterizedThreadStart start = new ParameterizedThreadStart(DownLoadHtml);
            Thread thread = new Thread(start);
            thread.Start();
        }

        private void DownLoadHtml(object obj)
        {
            for (int i = 30000; i < 30010; i++)
            {
                using (WebClient client = new WebClient())
                {
                    try
                    {
                        client.DownloadFile(@"http://job.cnblogs.com/offer/" + i + "/", @"E:\html\" + i + ".html");
                        this.Invoke(new Action(delegate() {
                           this.textBox1.AppendText("第"+i+"个帖子下载完成!\n");
                        }));
                    }
                    catch (Exception)
                    {


                    }
                }
            }
            Action action = new Action(msg);
            this.Invoke(action);
        }

private void msg()
{ MessageBox.Show("下载完成!"); }

        private void button2_Click(object sender, EventArgs e)
        {
            ParameterizedThreadStart start = new ParameterizedThreadStart(mianji);
            Thread thread = new Thread(start);
            thread.Start(5);
        }

        private void mianji(object r)
        {
            double result = Math.PI * Convert.ToDouble(r) * Convert.ToDouble(r);
            MessageBox.Show(result.ToString());
        }

        private void button3_Click(object sender, EventArgs e)
        {
            WaitCallback wait = new WaitCallback(DownLoadHtml);
            ThreadPool.QueueUserWorkItem(wait);
        }

        private void button4_Click(object sender, EventArgs e)
        {
            for (int i = 30000; i < 30020; i++)
            {
                WaitCallback wait = new WaitCallback(DownLoadHtml1);
                ThreadPool.QueueUserWorkItem(wait,i);
            }
            //this.Invoke(new Action(delegate()
            //{
            //    MessageBox.Show("下载完成!");
            //}));
        }

        private void DownLoadHtml1(object i)
        {
            try
            {
                WebClient client = new WebClient();
                client.DownloadFile(@"http://job.cnblogs.com/offer/" + i + "/", @"E:\html\" + i + ".html");
                this.Invoke(new Action(delegate()
                {
                    this.textBox1.AppendText("第" + i + "个帖子下载完成!\n");
                }));

            }
            catch (Exception)
            {


            }
        }