ASP.NET自带对象JSON字符串与实体类的转换

 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 GetJsonT>(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 ParseFormJsonT>(string szJson)
  {
    T obj = Activator.CreateInstanceT>();
    using (MemoryStream ms = new MemoryStream (Encoding.UTF8.GetBytes(szJson)))
    {
      DataContractJsonSerializer dcj = new DataContractJsonSerializer(typeof(T));
      return (T)dcj.ReadObject(ms);
    }
  }
}

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

%@ 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;
    ListTestData> tds = new ListTestData>();
    //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.GetJsonListTestData>>(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>