Linq to Sql 序列化和反序列化

public class Test<T>
    {
        public List<T> GetList(string str)
        {
            DataContractSerializer dcs = new DataContractSerializer(typeof(List<T>));
            XmlReader xr = XmlReader.Create(new StringReader(str));
            List<T> lt = (List<T>)dcs.ReadObject(xr);
            xr.Close();
            return lt;
        }

        public string WriteList(List<T> lt)
        {
            DataContractSerializer dcs = new DataContractSerializer(typeof(List<T>));
            StringBuilder sb = new StringBuilder();
            XmlWriter writer = XmlWriter.Create(sb);
            dcs.WriteObject(writer, lt);
            writer.Close();
            return sb.ToString();
        }
    }