本文介绍了一种使用HTTPWebRequest检查URL是否存在的方法。通过发送HEAD请求并判断返回的状态码来确定目标URL的有效性。该方法简单实用，适用于快速验证网页链接的有效状态。
1 
private bool UrlExistsUsingHttpWebRequest( string url)
2
{
3
try
4
{
5 System.Net.HttpWebRequest myRequest = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(url);
6 myRequest.Method = " HEAD " ;
7 myRequest.Timeout = 100 ;
8 System.Net.HttpWebResponse res = (System.Net.HttpWebResponse)myRequest.GetResponse();
9 return (res.StatusCode == System.Net.HttpStatusCode.OK);
10
}
11 catch (System.Net.WebException we)
12 {
13 System.Diagnostics.Trace.Write(we.Message);
14 return false ;
15 }
16
private bool UrlExistsUsingHttpWebRequest( string url)2
{3
try 4
{5
System.Net.HttpWebRequest myRequest = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(url);6
myRequest.Method = " HEAD " ; 7
myRequest.Timeout = 100 ;8
System.Net.HttpWebResponse res = (System.Net.HttpWebResponse)myRequest.GetResponse();9
return (res.StatusCode == System.Net.HttpStatusCode.OK);10
} 11
catch (System.Net.WebException we)12
{13
System.Diagnostics.Trace.Write(we.Message);14
return false ;15
} 16
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