ASP.NET自带对象JSON字符串与实体类的转换

2020-01-21 14:28JoinJ ASP.NET教程

这篇文章主要介绍了ASP.NET自带对象JSON字符串与实体类的转换，感兴趣的小伙伴们可以参考一下

关于JSON的更多介绍,请各位自行google了解！如果要我写的话，我也是去Google后copy!嘿嘿,一直以来很想学习json，大量的找资料和写demo，总算有点了解! 切入正题!

还是先封装一个类吧! 这个类网上都可以找到的!有个这个类，一切都将变得简单了，哈哈。

									using System;

									using System.Collections.Generic;

									using System.Linq;

									using System.Web;

									using System.Runtime.Serialization.Json;

									using System.ServiceModel.Web;///记得引用这个命名空间

									using System.IO;

									using System.Text;

									/// <summary>

									/// Summary description for JsonHelper

									/// </summary>

									public class JsonHelper

									{

									  public JsonHelper()

									  {

									    //

									    // 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);

									    }

									  }

									}

测试实体类：

									public class TestData

									{

									  public TestData()

									  {

									  }

									  public int Id { get; set; }

									  public string Name { get; set; }

									  public string Sex { get; set; }

									}

测试页面：

									<%@ Page Language="C#" %>

									<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

									<script runat="server">

									  protected void Page_Load(object sender, EventArgs e)

									  {

									    string jsonStr = string.Empty;

									    List<TestData> tds = new List<TestData>();

									    //测试数据

									    for (int i = 1; i < 4; i++)

									    {

									      tds.Add(new TestData() { Id = i, Name = "jinho" + i, Sex = "male" });

									    }    //把一个list转换为json字符串

									    jsonStr = JsonHelper.GetJson<List<TestData>>(tds);

									    Response.Write(jsonStr);

									    this.Page.ClientScript.RegisterStartupScript(this.GetType(), "json", "getJson(" + jsonStr + ");", true);

									  }

									</script>

									<script type="text/javascript">

									  function getJson(jsonStr) {    //使用eval函数

									    var json = eval(jsonStr);     //因为上面为list集合

									    for (var i = 0; i < json.length; i++) {

									      alert(json[i].Id + "Name:" + json[i].Name);

									    }

									  }

									</script>

									<html xmlns="http://www.w3.org/1999/xhtml">

									<head runat="server">

									  <title></title>

									</head>

									<body>

									  <form id="form1" runat="server">

									  <div>

									  </div>

									  </form>

									</body>

									</html>