.net 실체 클래스 와 json 상호 변환

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>
  ///        JSON     
  /// </summary>
  /// <typeparam name="T">    </typeparam>
  /// <param name="obj">    </param>
  /// <returns>JSON   </returns>
  public static string GetJson<T>(T obj)
  {
    //        System.ServiceModel.Web 
    /**
     *           ,System.Runtime.Serialization.Json; Json      
     * */
    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        
  /// </summary>
  /// <typeparam name="T">    </typeparam>
  /// <param name="szJson">JSON   </param>
  /// <returns>    </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);
    }
  }
 

  }

} 

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; }
  }
} 

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)
    {

      //    json
      testData t1 = new testData();
      t1.Id = 1;
      t1.Name = "001  ";
      t1.Sex = " ";
      testData t2 = new testData();
      t2.Id = 2;
      t2.Name = "002  ";
      t2.Sex = " ";
      testData t3 = new testData();
      t3.Id = 3;
      t3.Name = "003  ";
      t3.Sex = " ";
      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    

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

  }
}