曾经的代码系列——AJAX和JSON生成下拉列表框

代码测试使用

前台页面

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="GetGradeClassInfo.aspx.cs" Inherits="Eyes.Web.GetGradeClassInfo" %>





    
    
    


    

    

        
    
    
    

        
        
           
        
    
    

后台页面——手动拼接Json字符串

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;

namespace Eyes.Web
{
    public partial class GetGradeClassInfo : System.Web.UI.Page
    {
        BLL.GradeManager gradeManager = new BLL.GradeManager();
        BLL.ClassManager classManager = new BLL.ClassManager();


        //存放年纪信息
        List listGrades = null;
        List listClasses = null;
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!string.IsNullOrWhiteSpace(Request.QueryString["isAjax"]))
            {
                System.Threading.Thread.Sleep(5000);
                LoadData();
                string gradeArrStr = GetGradeDataString();
                string classArrStr = GetClassDataString();
                Response.Write("{grades:"+gradeArrStr+",classes:"+classArrStr+"}");
                Response.End();
            }
        }
        /// 

        /// 获得年级数据字符串
        /// 
        /// [{id:1,name:"eyes"},{}]
        public string GetGradeDataString()
        {
            StringBuilder sbStr = new StringBuilder("[");
            foreach (Model.Grades  model in listGrades)
            {
                sbStr.Append("{id:");
                sbStr.Append(model.GID);
                sbStr.Append(",name:\"");
                sbStr.Append(model.GName);
                sbStr.Append("\"},");
            }
            return sbStr.ToString().Substring(0, sbStr.Length - 1) + "]";
        }
        /// 

        /// 获得班级数据字符串
        /// 
        /// 
        public string GetClassDataString()
        {
            StringBuilder sbStr = new StringBuilder("[");
            foreach (Model.Classes model in listClasses)
            {
                sbStr.Append("{id:");
                sbStr.Append(model.CID);
                sbStr.Append(",name:\"");
                sbStr.Append(model.CName);
                sbStr.Append("\",cgId:");
                sbStr.Append(model.CGID);
                sbStr.Append("},");
            }
            return sbStr.ToString().Trim(',') + "]";
        }

        public void LoadData()
        {
            listGrades = gradeManager.GetAllGrades();
            listClasses = classManager.GetAllClasses();
        }
           
    }
}

转载于:https://my.oschina.net/OceanEyes/blog/381602