using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace StudentsSystemHx
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("歡迎使用2018級學生管理系統");
            Console.WriteLine("===============================================");
            Console.WriteLine("請選擇如下操作：");
            Console.WriteLine();
            Console.WriteLine("A：新增  B：查詢  C:刪除  D：修改  E退出系統");
            Hashtable stu = new Hashtable();
            Students student = new Students();
            string ch;
            Console.Write("請輸入選擇的功能：");
            ch = Console.ReadLine();

            while(ch!="E")
            {
                switch(ch)
                {
                    case "A":
                        AddStudent(stu);
                        break;
                    case "B":
                        QueryStudent(stu);
                        break;
                    case "C":
                        break;
                    case "D":
                        break;
                    case "E":
                        break;
                }
                Console.Write("請輸入選擇的功能：");
                ch = Console.ReadLine();
            }

        }
        public static void AddStudent(Hashtable stu)
        {
            string sno;
            Console.WriteLine("請輸入新增學生的資訊");
            Console.WriteLine("請輸入學生學號：");
            sno = Console.ReadLine();
            while(stu.Contains(sno))
            {
                Console.WriteLine("該學生已存在，請重新輸入：");
                sno = Console.ReadLine();
            }
               Students s= new Students();
               Console.WriteLine("請輸入學生姓名：");
               string name = Console.ReadLine();
               Console.WriteLine("請輸入學生性別：");
               string sex = Console.ReadLine();
               Console.WriteLine("請輸入學生班級：");
               string class_ = Console.ReadLine();
               Console.WriteLine("請輸入學生語文成績：");
               double chinese = double.Parse(Console.ReadLine());
               Console.WriteLine("請輸入學生數學成績：");
               double math = double.Parse(Console.ReadLine());
               Console.WriteLine("請輸入學生英語成績：");
               double english = double.Parse(Console.ReadLine());
               s.setSno(sno);
               s.setName(name);
               s.setSex(sex);
               s.setClass_(class_);
               s.setChinese(chinese);
               s.setMath(math);
               s.setEnglish(english);
               stu.Add(sno,s);
            
        }
        public static void QueryStudent(Hashtable stu)
        {
            string sno;
            Console.WriteLine("請輸入查詢學生的學號;");
            sno = Console.ReadLine();  
            
            ICollection c = stu.Values;
            IEnumerator ie=c.GetEnumerator();
            
            while (ie.MoveNext())
            {
                string s = ((Students)ie.Current).showMsg();
                Console.WriteLine(s);
            }


        }

    }
}
 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace StudentsSystemHx
{
    class Students
    {
        string sno;
        string name;
        string sex;
        string class_;
        double chinese;
        double math;
        double english;


        //public Students( string sno,string name,  string sex,string class_,double chinese,double math, double english)
        //{
        //}
        public void setSno(string sno)
        {
            this.sno = sno;
        }
        public void setName(string name)
        {
            this.name = name;
        }
        public void setSex(string sex)
        {
            this.sex = sex;
        }
        public void setClass_(string class_)
        {
            this.class_= class_;
        }
        public void setChinese(double chinese)
        {
            this.chinese = chinese;
        }
            public void setMath(double math)
        {
            this.math = math;
        }
        public void setEnglish(double english)
        {
            this.english = english;
        }
        public string showMsg()
        {
            Console.WriteLine("學號：{0}", sno);
            Console.WriteLine("姓名：{0}", name);
            Console.WriteLine("性別：{0}", sex);
            Console.WriteLine("班級：{0}", class_);
            Console.WriteLine(" 語文成績 " + chinese + " 數學成績 " + math + " 英語成績 " + english);
            return sno + " " + " 姓名 " + name;
        }
    }
}