那些大方舍得为你花钱的人，并不是多么富有，谁的钱都不是大风刮来的，而是他觉得你们的关系比钱重要，因为重要才舍得。透过云端的道路，只亲吻攀登者的足迹。
private void Page_Load(object sender, System.EventArgs e)
{
string url1 = "http://s.haodaima.com/";
string url2 = "//www.haodaima.com/images/logo.gif";
Response.Write("<li>方法1：");
Response.Write(url1 + " 存在：" + UrlExistsUsingHttpWebRequest(url1).ToString());
Response.Write("<li>方法2：");
Response.Write(url1 + " 存在：" + UrlExistsUsingSockets(url1).ToString());
Response.Write("<li>方法3：");
Response.Write(url1 + " 存在：" + UrlExistsUsingXmlHttp(url1).ToString());
Response.Write("<li>方法1：");
Response.Write(url2 + " 存在：" + UrlExistsUsingHttpWebRequest(url2).ToString());
Response.Write("<li>方法3：");
Response.Write(url2 + " 存在：" + UrlExistsUsingXmlHttp(url2).ToString());
} private bool UrlExistsUsingHttpWebRequest(string url){
try
{
System.Net.HttpWebRequest myRequest = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(url);
myRequest.Method = "HEAD";
myRequest.Timeout = 100;
System.Net.HttpWebResponse res = (System.Net.HttpWebResponse)myRequest.GetResponse();
return (res.StatusCode == System.Net.HttpStatusCode.OK);
}
catch (System.Net.WebException we)
{
System.Diagnostics.Trace.Write(we.Message);
return false;
}
} private bool UrlExistsUsingXmlHttp(string url)
{
//注意：此方法需要引用Msxml2.dll
MSXML2.XMLHTTP _xmlhttp = new MSXML2.XMLHTTPClass();
_xmlhttp.open("HEAD", url, false, null, null);
_xmlhttp.send("");
return (_xmlhttp.status == 200);
}
private bool UrlExistsUsingSockets(string url)
{
if (url.StartsWith("http://")) url = url.Remove(0, "http://".Length);
try
{
System.Net.IPHostEntry ipHost = System.Net.Dns.Resolve(url);
return true;
}
catch (System.Net.Sockets.SocketException se)
{
System.Diagnostics.Trace.Write(se.Message);
return false;
}
}
到此这篇关于asp.net下检测远程URL是否存在的三种方法就介绍到这了。人家怕你，并不是一种福，人家欺你，并不是一种辱。更多相关asp.net下检测远程URL是否存在的三种方法内容请查看相关栏目，小编编辑不易，再次感谢大家的支持！
