c# .net 將List序列化

/// <summary>        /// 序列化List        /// </summary>        /// <param name="al"></param>        /// <returns>string</returns>        public string SerializeArrayList(ArrayList al)        {            Type[] extra = new Type[1];            extra[0] = typeof(LocalNetInfo);           // extra[0] = typeof(string);            XmlSerializer xs = new XmlSerializer(typeof(ArrayList), extra);            MemoryStream ms = new MemoryStream();            XmlTextWriter tw = new XmlTextWriter(ms, Encoding.Default);            xs.Serialize(tw, al);            tw.Close();            return Encoding.Default.GetString(ms.ToArray());        }

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