检测远程URL是否存在的三种方法

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private bool UrlExistsUsingHttpWebRequest( string url)
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{
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try
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{
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System.Net.HttpWebRequest myRequest = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(url);
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myRequest.Method = " HEAD " ;
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myRequest.Timeout = 100 ;
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System.Net.HttpWebResponse res = (System.Net.HttpWebResponse)myRequest.GetResponse();
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return (res.StatusCode == System.Net.HttpStatusCode.OK);
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}
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catch (System.Net.WebException we)
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{
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System.Diagnostics.Trace.Write(we.Message);
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return false ;
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}
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