using Newtonsoft.Json;

using System.Runtime.Serialization.Json;

using System.Text;

    public class JsonHelper

    {

        /// <summary>

        /// 生成Json格式

        /// </summary>

        /// <typeparam name="T"></typeparam>

        /// <param name="obj"></param>

        /// <returns></returns>

        public static string GetJson<T>(T obj)

        {

            DataContractJsonSerializer json = new DataContractJsonSerializer(obj.GetType());

            using (MemoryStream stream = new MemoryStream())

            {

                json.WriteObject(stream, obj);

                string szJson = Encoding.UTF8.GetString(stream.ToArray()); return szJson;

            }

        }

        /// <summary>

        /// 获取Json的Model

        /// </summary>

        /// <typeparam name="T"></typeparam>

        /// <param name="szJson"></param>

        /// <returns></returns>

        public static T ParseFromJson<T>(string szJson)

        {

            T obj = Activator.CreateInstance<T>();

            using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(szJson)))

            {

                DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());

                return (T)serializer.ReadObject(ms);

            }

        }

        /// <summary>

        /// 解析JSON数组生成对象实体集合

        /// </summary>

        /// <typeparam name="T">对象类型</typeparam>

        /// <param name="json">json数组字符串(eg.[{"ID":"1","Name":"lttr"}])</param>

        /// <returns>对象实体集合</returns>

        public static List<T> DeserializeJsonToList<T>(string json) where T : class

        {

            JsonSerializer serializer = new JsonSerializer();

            StringReader sr = new StringReader(json);

            object o = serializer.Deserialize(new JsonTextReader(sr), typeof(List<T>));

            List<T> list = o as List<T>;

            return list;

        }

    }