ASP.NET自带对象JSON字符串与实体类的转换

2024-07-10 12:46:56

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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>

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