.net 实体类与json转换（.net自带类库实现）

注意要点。

1.jsonhelp编写时候添加的引用。System.Runtime.Serialization.Json;

2.实体类需声明为public

jsonhelp代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.Serialization.Json;
using System.IO;
namespace JsonTest
{
    class JsonHelp
    {
        public JsonHelp()
    {
        //
        // TODO: Add constructor logic here
        //
    }
    /// <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>
    /// 把JSON字符串还原为对象
    /// </summary>
    /// <typeparam name="T">对象类型</typeparam>
    /// <param name="szJson">JSON字符串</param>
    /// <returns>对象实体</returns>
    public static T ParseFormJson<T>(string szJson)
    {
        T obj = Activator.CreateInstance<T>();
        using (MemoryStream ms = new MemoryStream (Encoding.UTF8.GetBytes(szJson)))
        {
            DataContractJsonSerializer dcj = new DataContractJsonSerializer(typeof(T));
            return (T)dcj.ReadObject(ms);
        }
    }

    }
}

 实体类代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace JsonTest
{
  public  class testData
    {
        public testData()
    {
    }
    public int Id { get; set; }
    public string Name { get; set; }
    public string Sex { get; set; }
    }
}

 控制台应用程序测试代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace JsonTest
{
    class Program
    {
        static void Main(string[] args)
        {
            //实体类转json
            testData t1 = new testData();
            t1.Id = 1;
            t1.Name = "001姓名";
            t1.Sex = "男";
            testData t2 = new testData();
            t2.Id = 2;
            t2.Name = "002姓名";
            t2.Sex = "男";
            testData t3 = new testData();
            t3.Id = 3;
            t3.Name = "003姓名";
            t3.Sex = "男";
            List<testData> tlist = new List<testData>();
            tlist.Add(t1);
            tlist.Add(t2);
            tlist.Add(t3);
         Console.WriteLine(JsonHelp.GetJson<List<testData>>(tlist));
        // Console.ReadKey();
           //json转实体类

         List<testData> tl = JsonHelp.ParseFormJson <List<testData>>(JsonHelp.GetJson<List<testData>>(tlist));
         Console.WriteLine(tl.Count);
         Console.WriteLine(tl[0].Name);
         Console.ReadKey();

        }
    }
}

 在查找资料过程中参考了一下同学的博文

http://www.cnblogs.com/jinho/archive/2010/04/18/1715044.html

http://blog.csdn.net/wang_cel/article/details/44587201