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HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();
WebRequest wr = WebRequest.Create("http://www.ip138.com/ips138.asp");
Stream s = wr.GetResponse().GetResponseStream();
StreamReader sr = new StreamReader(s, Encoding.Default);
string all = sr.ReadToEnd(); //读取网站的数据
int start = all.IndexOf("您的IP地址是:[") + 9;
int end = all.IndexOf("]", start);
tempip = all.Substring(start, end - start);
sr.Close();
s.Close();