使用BackgroundWorker后，点击按钮时还是有假死状态

2013-03-01 01:15:50 337 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

别再踩坑了！Win10下用阿狸狗V3.2.6安装Cadence SPB 17.4的保姆级避坑指南本文提供了Win10系统下使用阿狸狗V3.2.6安装Cadence SPB 17.4的详细避坑指南，涵盖环境准备、安装失败清理、分步安装与问题诊断、授权配置及典型故障排除等内容，帮助用户顺利完成安装并避免常见错误。阅读详情

点击后，开始一会儿界面会有假死状态，过完这个假死状态后面就流畅了，请问这个是什么问题。



BackgroundWorker bw = null;



        public Form3()

        {

            InitializeComponent();



            bw = new BackgroundWorker();

            bw.WorkerSupportsCancellation = true;

            bw.DoWork += new DoWorkEventHandler(bw_DoWork);

            bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bw_RunWorkerCompleted);

        }



        void bw_DoWork(object sender, DoWorkEventArgs e)

        {

            for (int i = 1; i < 100; i++)

            {

                Thread.Sleep(1);

                if (bw.CancellationPending)

                {

                    e.Cancel = true;

                    break;

                }



                this.Invoke((MethodInvoker)delegate

                {

                    this.richTextBox1.Text += String.Format("第{0}次测试是否联网：{1}", i.ToString(), IsWWW("http://www.baidu.com?guid=" + Guid.NewGuid())) + Environment.NewLine;

                });

                Thread.Sleep(2000);

            }

        }



        void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)

        {

            this.richTextBox1.Text += "执行完毕";

        }



        private void button1_Click(object sender, EventArgs e)

        {

            this.button1.Enabled = false;

            this.button2.Enabled = true;



            bw.RunWorkerAsync();

        }



        private void button2_Click(object sender, EventArgs e)

        {

            this.button1.Enabled = true;

            this.button2.Enabled = false;



            bw.CancelAsync();

        }



        private void richTextBox1_TextChanged(object sender, EventArgs e)

        {

            RichTextBox textbox = (RichTextBox)sender;



            textbox.SelectionStart = textbox.Text.Length;

            textbox.ScrollToCaret();

        }





        private bool IsWWW(string url)

        { 

            try

            {

                new WebClient().DownloadString(url);

                return true;

            }

            catch (Exception ex)

            {

                return false;

            }

        }