本文用3种方法检测远程URL是否存在。
private void Page_Load(object sender, System.EventArgs e)
{
string url1 = "http://dotnet.aspx.cc/";
string url2 = "http://dotnet.aspx.cc/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;
}
}
发表于 @ 2005年11月30日 18:32:00 | 评论( 6 ) | 编辑| 举报| 收藏
旧一篇:FireFox值得称道的地方 | 新一篇:上传之前检测图片大小lulei 发表于2006年2月13日 17:12:00 IP:举报
这样可以不？
public static bool CheckIsExist(string Url)
{
try
{
WebRequest HWRequest;
HWRequest = HttpWebRequest.Create(url);
using(WebResponse HWResponse = HWRequest.GetResponse())
{
return ture;
}
}
catch
{
return false;
}
}
本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/net_lover/archive/2005/11/30/540417.aspx