获取客户端IP地址

/// <summary>
/// 获取客户端IP
/// </summary>
/// <param name="page"></param>
/// <returns></returns>
public static string GetClientIP(System.Web.UI.Page page)
{
    string ipAddress = "";
    if (page.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] == null)
    {
        ipAddress = page.Request.ServerVariables["Remote_Addr"];
    }
    else
    {
        ipAddress = page.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
    }
    if (ipAddress.IndexOf(",") > 0)
    {
        ipAddress = ipAddress.Substring(0, ipAddress.IndexOf(","));
    }
    return ipAddress;
}