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[转载].NET网站自动浏览器分享，解决IIS6应用池回收后第一次访问慢问题 – 事理 – 博客园.
.NET开发的网站，如果不是使用预编译发布，网站会在iis6应用池回收后第一次访问很慢，为了解决这个问题，今天写了一个自动浏览的工具，现在分享给大家，界面如下。
关键部分源码
//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;
}
