C# 验证URL有效性

最新推荐文章于 2023-05-16 09:51:42 发布

jxitc

最新推荐文章于 2023-05-16 09:51:42 发布

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文章标签： url c# string null object 2010

本文链接：https://blog.youkuaiyun.com/jxitc/article/details/6148561

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TEST 这篇日志，是直接从OneNote 2010里面发送到优快云上去的！！

发送接口如下：

http://blog.youkuaiyun.com/jxitc/services/metablogapi.aspx

检测远程URL是否存在的三种方法收藏

< type="text/javascript">< type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js">

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("

方法1：");
Response.Write(url1 + " 存在：" + UrlExistsUsingHttpWebRequest(url1).ToString());
Response.Write("
方法2：");
Response.Write(url1 + " 存在：" + UrlExistsUsingSockets(url1).ToString());
Response.Write("
方法3：");
Response.Write(url1 + " 存在：" + UrlExistsUsingXmlHttp(url1).ToString());
Response.Write("
方法1：");
Response.Write(url2 + " 存在：" + UrlExistsUsingHttpWebRequest(url2).ToString());
Response.Write("
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;
}
}

Pasted from <http://blog.youkuaiyun.com/jetxia/archive/2006/03/11/621506.aspx>