C#获取真实IP地址实现方法

        {
            string[] _iparray = _ip.Split ( '.' );

            _Int64 = Int64.Parse ( _iparray.GetValue ( 0 ).ToString() ) * 256 * 256 * 256 + Int64.Parse ( _iparray.GetValue ( 1 ).ToString() ) * 256 * 256 + Int64.Parse ( _iparray.GetValue ( 2 ).ToString() ) * 256 + Int64.Parse ( _iparray.GetValue ( 3 ).ToString() ) - 1;
        }
        return _Int64;
    }

    /// <summary>
    /// /ip十进制
    /// </summary>
    public static Int64 DenaryIp
    {
        get {
            Int64 _Int64 = 0;

            string _ip = IP;
            if ( _ip.LastIndexOf ( "." ) > -1 )
            {
                string[] _iparray= _ip.Split ( '.' );

                _Int64 = Int64.Parse ( _iparray.GetValue ( 0 ).ToString() ) * 256 * 256 * 256 + Int64.Parse ( _iparray.GetValue ( 1 ).ToString() ) * 256 * 256 + Int64.Parse ( _iparray.GetValue ( 2 ).ToString() ) * 256 + Int64.Parse ( _iparray.GetValue ( 3 ).ToString() )-1;
            }
            return _Int64;
        }
    }

    public static string IP
    {
        get
        {
            string result = String.Empty;
            result = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
            if ( result != null && result != String.Empty )
            {
               //可能有代理