static string fanhuiurl(string cahxunurl) { string url = ""; HttpWebRequest req = (HttpWebRequest)WebRequest.Create(cahxunurl); req.Method = "HEAD"; req.AllowAutoRedirect = false; HttpWebResponse myResp = (HttpWebResponse)req.GetResponse(); if (myResp.StatusCode == HttpStatusCode.Redirect) { url = myResp.GetResponseHeader("Location"); } return url; }