.net实体类与json相互转换

.net实体类与json相互转换时，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();
    }

  }
} 

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