ASP.NET JSON字符串与实体类的互转换示例代码
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！
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本文标题：ASP.NET JSON字符串与实体类的互转换示例代码
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