获得当前页面客户端的IP

/// <summary>
/// 获得当前页面客户端的IP
/// </summary>
/// <returns>当前页面客户端的IP</returns>
public static string GetIP()
{

string result = String.Empty;

result = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (string.IsNullOrEmpty(result))
{
result = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
}

if (string.IsNullOrEmpty(result))
{
result = HttpContext.Current.Request.UserHostAddress;
}

if (string.IsNullOrEmpty(result) || !Utils.IsIP(result))
{
return "127.0.0.1";
}

return result;

}