.net实体类与json相互转换

2020-01-21 14:27人曾在师大 ASP.NET教程

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.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();

									    }

									  }

									}