App_Code/IP_Address.cs

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

/// <summary>
/// IP_Address 的摘要说明
/// </summary>
public class IP_Address
{
    public IP_Address()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }

    public static string getIp() 
    { 
        if (System.Web.HttpContext.Current.Request.ServerVariables["HTTP_VIA"] != null)           
            return System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].Split(new char[] { ',' })[0]; 
        else           
            return System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
    }
}