我有一个名为GetIP的函数,我在启动时和用户按下按钮时调用它。 由于某种原因,它在启动时不会崩溃,但是在使用按钮调用函数时会发生崩溃。没有任何事情只会冻结。
功能代码:
private void GetIP()
{
string pageTitle = functions.GetWebPageTitle("http://xyro18.woelmuis.nl/index.php");
string[] ip = new string[2];
ip = pageTitle.Split('|');
currentIpLabel.Text = ip[0];
webIpLabel.Text = ip[1];
}
现在我发现它在我的getWebPageTitle函数中崩溃了
功能代码:
public static string GetWebPageTitle(string url)
{
// Create a request to the url
HttpWebRequest request = HttpWebRequest.Create(url) as HttpWebRequest;
request.Method = "HEAD";
// If the request wasn't an HTTP request (like a file), ignore it
if (request == null) return null;
// Use the user's credentials
request.UseDefaultCredentials = true;
// Obtain a response from the server, if there was an error, return nothing
HttpWebResponse response = null;
try { response = request.GetResponse() as HttpWebResponse; }
catch (WebException) { return null; }
// Regular expression for an HTML title
string regex = @"(?<=<title.*>)([\s\S]*)(?=</title>)";
// If the correct HTML header exists for HTML text, continue
if (new List<string>(response.Headers.AllKeys).Contains("Content-Type"))
if (response.Headers["Content-Type"].StartsWith("text/html"))
{
// Download the page
WebClient web = new WebClient();
web.UseDefaultCredentials = true;
string page = web.DownloadString(url);
// Extract the title
Regex ex = new Regex(regex, RegexOptions.IgnoreCase);
return ex.Match(page).Value.Trim();
}
// Not a valid HTML page
return null;
}
它在网络上崩溃.DownloadString
崩溃我的意思是冻结并且不显示任何exeptions等。
答案 0 :(得分:0)
嗯,我不能说我知道为什么会冻结,但这里有一些建议可能会有所帮助: