asp.net获取客户端IP Class

using System;
using System.Web;

namespace Plugins
{
public class ClientIP
{
public static string GetUserIP()
{
string result = String.Empty;

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;
}

if (null == result || result == String.Empty)
{
return "0.0.0.0";
}

return result;
}
}
}