try catch 语句 自定义异常 并简单调用

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

namespace ConsoleApplication37ZiJXIe
{

    public class InvalidStudentException : Exception
    {

        private string id;

        public string Id
        {
            get
            {

                return id;
            }

        }

        public InvalidStudentException(string Id)

        {

            this.id = Id;


        }


        public override string Message
        {
            get
            {
                return "信息不符合规范" + Id;
            }
        }


    }



        public  class Student
    {
        private string studentid;

        public string StudentId
        {
            get
            {

                return studentid;
            }

        }

        public Student(string Id)

        {


            studentid = Id;

            if (studentid.Length != 3)
            {

                throw new InvalidStudentException(studentid);

            }


        }



        
       



    }

    class Program
    {
        static void Main(string[] args)
        {

            Student ss;

            try
            {
                ss = new Student("123");

                Console.WriteLine(ss.StudentId);

            }

            catch (InvalidStudentException ex)
            {

                Console.WriteLine(ex.Message);

            }
            Console.ReadLine();


        }

    }
}