ASP.NET 自带对象 JSON字符串与实体类的转换

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>

:关于json字符串转换为实体请各位自己测试吧!只要有上面那个JsonHelper 类,一切都好办!哈哈睡觉咯!

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