Backup/WEB/StudentShow.aspx.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using BLL;
using Model;

namespace WEB
{
    public partial class StudentShow : System.Web.UI.Page
    {
        private GradeBll gradeBll = new GradeBll();
        private StuBll stuBll = new StuBll();
        private TeacherBll teacherBll = new TeacherBll();
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!this.IsPostBack)
            {
                if (Request.QueryString["stuId"] != null)
                {
                    StuLinq();
                }
                StudentLinq();
            }
        }
        /// <summary>
        /// 根据Id查询学生信息
        /// </summary>
        void StuLinq()
        {
            if (Cache["stuId"] != null)
            {
            int stuId = int.Parse(Request.QueryString["stuId"]);
            List<StuInfo> stuInfo = stuBll.GetStuInfo();
            List<Grade> grade = gradeBll.GetGrade();
            List<Teacher> teacher = teacherBll.GetTeacherInfo();
            var result = from t in teacher
                         join g in grade on t.teaId equals g.gSubject
                         join i in stuInfo on g.stuId equals i.stuId
                         where i.stuId == stuId
                         select new
                         {
                             i.stuId,
                             i.stuName,
                             i.stuPwd,
                             t.teaSubject,
                             g.gScore,

                         };
            
            this.RtList.DataSource = result;
            RtList.DataBind();
            }
        }
        /// <summary>
        /// 直接查询所有学生数据
        /// </summary>
        void StudentLinq()