[ASP.NET]使用JQuery來接收JSON字串

[ASP.NET]使用JQuery來接收JSON字串

上一篇【使用JQuery來傳遞JSON字串】介紹了如何在前端傳遞JSON物件至後端接收,這篇主要介紹如何從後端組出JSON物件,回傳至前端接收。

接續上一篇範例,我們這篇點查詢後,將使用者的資訊利用JSON.NET組合JSON格式,丟回前端做處理。

.ashx

後端我們一樣用泛型處理常式來處理,有一個我們自行定義的User class,裡面有User的Name,和他所會的Skill,依抓資料的來源取得資料後組成List<string>,只要透過Json.NET的SerializeObject function就可以輕易的將List<Object>轉成Json字串。

image

.aspx

回傳前端console.log來看,會看到一個object的Array,接著只要處理顯示畫面就可以了,非常的容易 !!

image

完整程式碼


using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace MyMVC.WebFrom.Json
{
    /// <summary>
    /// ReturnJsonHandler 的摘要描述
    /// </summary>
    public class ReturnJsonHandler : IHttpHandler
    {

        public class User
        {
            public string UserName { get; set; }
            public List<string> Skill { get; set; }
        }

        public void ProcessRequest(HttpContext context)
        {
            List<User> UserList = GetUser();
            string ReturnString = JsonConvert.SerializeObject(UserList);
            context.Response.Write(ReturnString);
        }

        private List<User> GetUser()
        {
            List<User> UserList = new List<User>();
            
            User User1 = new User();
            User1.UserName = "User1";
            User1.Skill = new List<string>() { "PHP", "ASP.NET" };

            User User2 = new User();
            User2.UserName = "User2";
            User2.Skill = new List<string>() { "JSP", "ASP.NET" };

            UserList.Add(User1);
            UserList.Add(User2);

            return UserList;
        }


        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="GetJson.aspx.cs" Inherits="MyMVC.WebFrom.Json.GetJson" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>
    <script src="../../Scripts/jquery-1.7.2.min.js"></script>
    <script type="text/javascript">

        $(function () {
            $('#btn_search').click(function () {
                $.ajax({
                    url: 'ReturnJsonHandler.ashx',
                    data: {}, //將陣列轉成Json
                    type: 'GET',
                    contentType: 'application/json; charset=utf-8',
                    dataType: 'json',
                    success: function (data) {
                        console.log(data);
                        for (var i = 0; i < data.length; i++) {
                            var string = "<div>";
                            string = data[i].UserName+":";
                            for (var k = 0; k < data[i].Skill.length; k++) {
                                string += data[i].Skill[k];
                            }
                            string += "<div/>";
                            $('#UserList').append(string);
                        }
                    }
                });
            });
        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <input type="button" id="btn_search" value="查詢" />
            <br />
            <div id="UserList">
            </div>
        </div>

    </form>
</body>
</html>