//手动点击浏览        private void btnBrowsing_Click(object sender, EventArgs e)        {            if (btnBrowsing.Enabled == true && chkEnableAutomaticBrowsing.Checked == true)            {                btnBrowsing.Enabled = false;                Thread thread = new Thread(new ThreadStart(AutoBrowsing));                thread.IsBackground = true;                thread.Start();            }            else            {                MessageBox.Show("任务正在执行!");            }        }        DateTime tempTime = DateTime.MinValue;//防止一分钟内刷新多次        private void timer1_Tick(object sender, EventArgs e)        {            DateTime dt = DateTime.Now;            //转钟时清除一天日志            if (dt.ToLongTimeString() == "0:00:00")            {                rtxtLogs.Text = string.Empty;            }            TimeSpan ts = dt - tempTime;            //1分钟内不得刷新两次            if (ts.TotalMinutes > 0)            {                //到点自动刷新                if (lstTime.Items.Contains(dt.ToShortTimeString()))                {                    tempTime = dt.AddMinutes(1);                    btnBrowsing_Click(null, null);                }            }        }        private void AutoBrowsing()        {            int itemTotalCount = 0;            CrossThreadCalls.SafeInvoke(this.lvWebsitInfo, new CrossThreadCalls.TaskDelegate(delegate()            {                itemTotalCount = lvWebsitInfo.Items.Count;            }));            for (int i = 0; i < itemTotalCount; i++)            {                string url = string.Empty;                CrossThreadCalls.SafeInvoke(this.lvWebsitInfo, new CrossThreadCalls.TaskDelegate(delegate()                {                    url = lvWebsitInfo.Items[i].SubItems[2].Text;                }));                int retry = 0;            retryFlag:                CrossThreadCalls.SafeInvoke(this.webBrowser1, new CrossThreadCalls.TaskDelegate(delegate()                {                    webBrowser1.Navigate(url);                }));                if (WaitWebPageLoad())                {                    CrossThreadCalls.SafeInvoke(this.rtxtLogs, new CrossThreadCalls.TaskDelegate(delegate()                    {                        rtxtLogs.AppendText(url + "浏览成功，浏览时间：" + DateTime.Now.ToLongTimeString() + "\r\n\r\n");                        rtxtLogs.ScrollToCaret();                    }));                    CrossThreadCalls.SafeInvoke(this.lvWebsitInfo, new CrossThreadCalls.TaskDelegate(delegate()                    {                        lvWebsitInfo.Items[i].SubItems[3].Text = DateTime.Now.ToString();                    }));                }                else                {                    CrossThreadCalls.SafeInvoke(this.rtxtLogs, new CrossThreadCalls.TaskDelegate(delegate()                    {                        rtxtLogs.AppendText(url + "浏览失败，即将重试" + (retry + 1) + "次\r\n");                        rtxtLogs.ScrollToCaret();                    }));                    if (retry < 2)//重试3次                    {                        retry++;                        Thread.Sleep(3000);                        goto retryFlag;                    }                    CrossThreadCalls.SafeInvoke(this.rtxtLogs, new CrossThreadCalls.TaskDelegate(delegate()                    {                        rtxtLogs.AppendText(url + "浏览失败\r\n\r\n");                        rtxtLogs.ScrollToCaret();                    }));                    CrossThreadCalls.SafeInvoke(this.lvWebsitInfo, new CrossThreadCalls.TaskDelegate(delegate()                    {                        lvWebsitInfo.Items[i].SubItems[3].Text = "自动浏览失败";                    }));                }            }            CrossThreadCalls.SafeInvoke(this.btnBrowsing, new CrossThreadCalls.TaskDelegate(delegate()            {                btnBrowsing.Enabled = true;            }));            CrossThreadCalls.SafeInvoke(this.webBrowser1, new CrossThreadCalls.TaskDelegate(delegate()            {                webBrowser1.Navigate("about:blank");            }));        }        /// <summary>        /// 判断webbrowser是否加载一个网页完毕，可判断包括iframe的网页        /// </summary>        /// <returns></returns>        private bool WaitWebPageLoad()        {            int i = 0;            string sUrl = string.Empty;            while (true)            {                Delay(50);  //系统延迟50毫秒，够少了吧！                WebBrowserReadyState webBrowserState = WebBrowserReadyState.Uninitialized;                CrossThreadCalls.SafeInvoke(this.webBrowser1, new CrossThreadCalls.TaskDelegate(delegate()                {                    webBrowserState = webBrowser1.ReadyState;                }));                if (webBrowserState == WebBrowserReadyState.Complete) //先判断是否发生完成事件。                {                    bool isBusy = true;                    CrossThreadCalls.SafeInvoke(this.webBrowser1, new CrossThreadCalls.TaskDelegate(delegate()                    {                        isBusy = webBrowser1.IsBusy;                    }));                    if (!isBusy) //再判断是浏览器是否繁忙                    {                        i = i + 1;                        if (i == 2)                        {                            CrossThreadCalls.SafeInvoke(this.webBrowser1, new CrossThreadCalls.TaskDelegate(delegate()                            {                                sUrl = webBrowser1.Url.ToString();                            }));                            if (sUrl.Contains("res") || sUrl.Contains("daohang.114so.cn")) //这是判断没有网络的情况下                            {                                return false;                            }                            else                            {                                return true;                            }                        }                        continue;                    }                    i = 0;                }            }        }        private void Delay(int Millisecond) //延迟系统时间，但系统又能同时能执行其它任务；        {            DateTime current = DateTime.Now;            while (current.AddMilliseconds(Millisecond) > DateTime.Now)            {                Application.DoEvents();//转让控制权                        }            return;        }