JSON Helper

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ServiceModel.Web;///记得引用这个命名空间
using System.Runtime.Serialization.Json;
using System.IO;
using System.Text;

namespace Sigil.Common
{
    /// <summary>
    /// JSON操作类
    /// </summary>
    public class JsonHelper
    {
        /// <summary>
        /// 把对象序列化 JSON 字符串 
        /// </summary>
        /// <typeparam name="T">对象类型</typeparam>
        /// <param name="obj">对象实体</param>
        /// <returns>JSON字符串</returns>
        public static string GetJson<T>(T obj)
        {
            //记住 添加引用 System.ServiceModel.Web 
            /**
             * 如果不添加上面的引用,System.Runtime.Serialization.Json; Json是出不来的哦
             * */
            DataContractJsonSerializer json = new DataContractJsonSerializer(typeof(T));
            using (MemoryStream ms = new MemoryStream())
            {
                json.WriteObject(ms, obj);
                string szJson = Encoding.UTF8.GetString(ms.ToArray());
                return szJson;
            }
        }

        /// <summary>
        /// Json反序列化,用于接收客户端Json后生成对应的对象
        /// </summary>
        /// <typeparam name="T">对象类型</typeparam>
        /// <param name="jsonString">JSON字符串</param>
        /// <returns>对象实体</returns>
        public static T ParseFormJson<T>(string jsonString)
        {
            using (var ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString)))
            {
                return (T)new DataContractJsonSerializer(typeof(T)).ReadObject(ms);
            }
        }

        /// <summary>
        /// JSON序列化
        /// </summary>
        public static string JsonSerializer<T>(T t)
        {
            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
            MemoryStream ms = new MemoryStream();
            ser.WriteObject(ms, t);
            string jsonString = Encoding.UTF8.GetString(ms.ToArray());
            ms.Close();
            return jsonString;
        }

        /// <summary>
        /// JSON反序列化
        /// </summary>
        public static T JsonDeserialize<T>(string jsonString)
        {
            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
            MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
            T obj = (T)ser.ReadObject(ms);
            return obj;
        }
    }
}

参考： 

　　http://www.cnblogs.com/zhaozhan/archive/2011/01/09/1931340.html

      http://www.cnblogs.com/yylp521/p/3148856.html