AJAX,JSON与MVC

有几个特殊之处

1. MVC框架中包含了一个特殊的JSONActionResult，可以直接返回JSON对象，注意它的格式与之前的asmx和页面静态方法都不一样，它直接就是一个JSON对象

2. 服务端和客户端编程都相对简单了。服务器端无须明确序列化，而客户端也无须解析JSON字符串了，因为返回的结果本来就是一个JSON对象

第一部分：Controller中的设计

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MvcApplication1.Controllers
{

    public class Employee
    {
        public int Id { get; set; }
        public string Name { get; set; }
    }

    [HandleError]
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            ViewData["Message"] = "Welcome to ASP.NET MVC!";

            return View();
        }

        public ActionResult About()
        {
            return View();
        }

        public ActionResult Employee() {
            return View();
        }


        [HttpPost]
        public ActionResult GetEmployee() {
            return Json(new Employee()
            {
                Id = 1,
                Name = "chenxizhang"
            });
        }


        
        
    }
}

第二部分:View中的设计

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage" %>

<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
    GetEmployee
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">

    <script src="../../Scripts/jquery-1.3.2-vsdoc.js" type="text/javascript"></script>

    <script type="text/javascript" language="javascript">
        $(function() {
            $("#bt").click(function() {
                $.ajax({
                    type: "POST",
                    contentType: "application/json",
                    url: "http://localhost:44203/Home/GetEmployee",
                    data: "{}",
                    dataType: 'json',
                    success: function(result) {
                        alert(result.Id);
                    }

                });
            });
        });
    
    </script>

    <h2>
        GetEmployee</h2>
    <input type="button" value="Invoke" id="bt" />
    <div id="info">
    </div>
</asp:Content>