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ASP.NET JSON字符串与实体类的互转换示例代码

2024-07-10 13:21:09
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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。

复制代码 代码如下:


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>对象类型</typeparam>
    /// <param>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>对象类型</typeparam>
    /// <param>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:

复制代码 代码如下:


public class TestData
{
    public TestData()
    {
    }
    public int Id { get; set; }
    public string Name { get; set; }
    public string Sex { get; set; }
}


测试页面:

复制代码 代码如下:


<%@ 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 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!

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