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>