有效性验证,C# 验证URL有效性

on 2011-1-18 in 博文摘选 | 0 Comment
TEST 这篇日志，是直接从OneNote 2010里面发送到CSDN上去的！！
发送接口如下：
http://blog.csdn.net/jxitc/services/metablogapi.aspx
有效性验证,C# 验证URL有效性

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;
     }
    }
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    Tags:  excel有效性 数据有效性 论证有效性分析 url验证 有效性验证

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