examination.cs

本在线考试系统采用了面向对象的分析和设计

using System;
using System.Collections.Generic;
using System.Text;

namespace ExaminationSystem.BLL.Domain
{
    public class Examination:DomainObject<long>
    {
        private string name;

        public virtual string Name
        {
            get { return name; }
            set { name = value; }
        }

        private DateTime startTime;

        public virtual DateTime StartTime
        {
            get { return startTime; }
            set { startTime = value; }
        }

        private DateTime endTime;

        public virtual DateTime EndTime
        {
            get { return endTime; }
            set { endTime = value; }
        }

        private IList<Class> attendClasses = new List<Class>();

        public virtual IList<Class> AttendClasses
        {
            get { return attendClasses; }
            set { attendClasses = value; }
        }

        private PaperStrategy paperStrategy;

        public virtual PaperStrategy PaperStrategy
        {
            get { return paperStrategy; }
            set { paperStrategy = value; }
        }
        private IList<Paper> papers = new List<Paper>();

        public virtual IList<Paper> Papers
        {
            get { return papers; }
            set { papers = value; }
        }
        public override int GetHashCode()
        {
            return (GetType().FullName + "|" +
                Name + "|" +
                StartTime.ToString()).GetHashCode();
        }
        public void AddClass(Class cls)
        {
            AttendClasses.Add(cls);
            cls.Examinations.Add(this);
        }
        private int lateMinutes;
       
        public virtual int LateMinutes
        {
            get { return lateMinutes; }
            set { lateMinutes = value; }
        }
        private int permitSubmitMinutes;

        public virtual int PermitSubmitMinutes
        {
            get { return permitSubmitMinutes; }
            set { permitSubmitMinutes = value; }
        }
        private bool IsStudentLate()
        {
            TimeSpan timeSpan =DateTime.Now - StartTime;
            if (timeSpan.Minutes > lateMinutes)
                return true;
            else
                return false;
        }
        private bool IsStudentEarly()
        {
            TimeSpan span = StartTime - DateTime.Now;
            if(span.TotalSeconds>0)
                return true;
            else
                return false;
        }
        private bool IsPermitSubmit()
        {
            TimeSpan span = DateTime.Now - StartTime;
            if (span.TotalMinutes > PermitSubmitMinutes)
                return true;
            else
                return false;

        }
        public  bool IsExaminationOver()
        {
            TimeSpan span = DateTime.Now - EndTime;
            if (span.TotalMinutes > 0)
                return true;
            else
                return false;
        }
        private bool IsReEnterExamination(Student student)
        {
            if (student.CurrentPaper == null)
            {
                foreach (Paper paper in student.Papers)
                {
                    if (paper.Examination == this)
                        return true;
                }
            }
            return false;
        }

        public void EnterExamination(Student student)
        {   
            if (IsExaminationOver())
                throw new Exception("考试已经结束！");
            if (student.CurrentPaper != null&& student.CurrentPaper.Examination==this)
                return;
            if (!AttendClasses.Contains(student.Class))
                throw new Exception("学生不在参加考试班级");   

            if (IsStudentLate())
                throw new Exception("学生考试迟到不能参加考试");

            if (IsStudentEarly())
                throw new Exception("考试未开始");

            if (student.CurrentPaper == null)
            {
                student.CurrentPaper = PaperStrategy.GetCurrentPaper();
                student.CurrentPaper.Student = student;

                student.CurrentPaper.Examination = this;
                this.Papers.Add(student.CurrentPaper);
            }
        }
        public void SubmitPaper(Student student)
        {
            if (student.CurrentPaper == null)
                throw new Exception("考试没有在考试状态或已经交卷！");
            if (!IsPermitSubmit())
                throw new Exception("不到交卷时间");
            student.CurrentPaper.IsSubmited = true;
        }
        public string AttendClassesToString
        {
            get
            {
                string csString="";
                foreach (Class cs in AttendClasses)
                {
                    csString += cs.Name+" ";
                }
                return csString;
            }
 
        }
       
    }
}