1、HttpContext.Current.Request.UserHostAddress;

2、HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];

3、string strHostName = System.Net.Dns.GetHostName();
string clientIPAddress = System.Net.Dns.GetHostAddresses(strHostName).GetValue(0).ToString();

4、HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

5、private string GetClientIP()
  {
   string result = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
   if (null == result || result == String.Empty)
   {
    result = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
   }

   if (null == result || result == String.Empty)
   {
    result = HttpContext.Current.Request.UserHostAddress;
   }
   return result;
  }

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