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.net實體類與json相互轉(zhuǎn)換時，注意要點(diǎn)：

1.jsonhelp編寫時候添加的引用。System.Runtime.Serialization.Json; 

2.實體類需聲明為public 

jsonhelp代碼： 

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>

  /// 把對象序列化 JSON 字符串 

  /// </summary>

  /// <typeparam name="T">對象類型</typeparam>

  /// <param name="obj">對象實體</param>

  /// <returns>JSON字符串</returns>

  public static string GetJson<T>(T obj)

  {

    //記住 添加引用 System.ServiceModel.Web 

    /**

     * 如果不添加上面的引用,System.Runtime.Serialization.Json; Json是出不來的哦

     * */

    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字符串還原為對象

  /// </summary>

  /// <typeparam name="T">對象類型</typeparam>

  /// <param name="szJson">JSON字符串</param>

  /// <returns>對象實體</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);

    }

  }

  }

} 

實體類代碼： 

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; }

  }

} 

控制臺應(yīng)用程序測試代碼： 

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)

    {

      //實體類轉(zhuǎn)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轉(zhuǎn)實體類

     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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