断远程文件是否存在代码,CSharp代码库,德仔网

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【CSharp】断远程文件是否存在

作者:dezai / 发布于2014/2/25/ 573

public static bool IsExist(string uri)
    {
      HttpWebRequest req = null;
      HttpWebResponse res = null;
      try
      {
        req = (HttpWebRequest)WebRequest.Create(uri);
        req.Method = "HEAD";
        req.Timeout = 100;
        res = (HttpWebResponse)req.GetResponse();
        return (res.StatusCode == HttpStatusCode.OK);
      }
      catch
      {
        return false;
      }
      finally
      {
        if (res != null)
        {
          res.Close();
          res = null;
        }
        if (req != null)
        {
          req.Abort();
          req = null;
        }
      }
    }

//2:

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);
}

//3:
private bool UrlExistsUsingSockets(string url)
{
 if (url.StartsWith("http://")) url = url.Remove(0, "http://".Length);
 try
 {
  System.Net.IPHostEntry ipHost =System.Net.Dns.GetHostEntry(url);// 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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　断远程文件是否存在　

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