.net4.0 实体与json相互转换

using System.Text;using System.IO;using System.Runtime.Serialization.Json;//http://blog.csdn.net/lee576/archive/2009/01/08/3736880.aspxnamespace Zhuyi.Utility{    public static class JsonUtility    {        public static string ObjectToJson(object item)        {            DataContractJsonSerializer serializer = new DataContractJsonSerializer(item.GetType());            using (MemoryStream ms = new MemoryStream())            {                serializer.WriteObject(ms, item);                StringBuilder sb = new StringBuilder();                sb.Append(Encoding.UTF8.GetString(ms.ToArray()));                return sb.ToString();            }        }        public static T JsonToObject<T>(string jsonString)        {            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));            MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));            T jsonObject = (T)ser.ReadObject(ms);            ms.Close();            return jsonObject;        }    }}