本文共 1393 字，大约阅读时间需要 4 分钟。

看了篇文章可能会用的上，直接贴过来了。

private bool UrlIsExist(String url){  System.Uri u = null;  try  {    u = new Uri(url);  }  catch { return false; }  bool isExist = false;  System.Net.HttpWebRequest r = System.Net.HttpWebRequest.Create(u) as System.Net.HttpWebRequest;  r.Method = "HEAD";  try  {    System.Net.HttpWebResponse s = r.GetResponse() as System.Net.HttpWebResponse;    if (s.StatusCode == System.Net.HttpStatusCode.OK)    {      isExist = true;    }  }  catch (System.Net.WebException x)  {    try    {      isExist = ((x.Response as System.Net.HttpWebResponse).StatusCode != System.Net.HttpStatusCode.NotFound);    }    catch { isExist = (x.Status == System.Net.WebExceptionStatus.Success); }  }  return isExist;}protected void Page_Load(object sender, EventArgs e){  Response.Write("
http://dotnet.aspx.cc/Images/ 是否存在：" + UrlIsExist("http://dotnet.aspx.cc/Images/"));  Response.Write("
http://dotnet.aspx.cc/ImagesX/ 是否存在：" + UrlIsExist("http://dotnet.aspx.cc/ImagesX/"));  Response.Write("
http://xxxxx/ 是否存在：" + UrlIsExist("http://xxxxx/"));  Response.Write("
hxxxxxxxxxxxxxxxxxxx 是否存在：" + UrlIsExist("hxxxxxxxxxxxxxxxxxxx"));  Response.Write("
http://dotnet.aspx.cc/Images/logoSite.gif 是否存在：" + UrlIsExist("http://dotnet.aspx.cc/Images/logoSite.gif"));  Response.Write("
http://dotnet.aspx.cc/Images/logoSite2.gif 是否存在：" + UrlIsExist("http://dotnet.aspx.cc/Images/logoSite2.gif"));}

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