要求使用面向对象编程思想（主要是类的封装）来编写一个简单的计算器，至少要能计算加、减、乘、除。

using System;

namespace _4_1
{
    class count
    {
        private double number1;
        private double number2;
        private string fuhao;
        public double Number1
        {
            get { return number1; }
            set { number1 = value; }
        }
        public double Number2
        {
            get { return number2; }
            set { number2 = value; }
        }
        public string Fuhao
        {
            get { return fuhao; }
            set
            {
                if (value=="+" ||value=="-"||value=="*"|| value =="/")
                {
                    fuhao = value;
                }
                else
                {
                    Console.WriteLine("请输入+ - * / 当中的运算符 ");
                    this.fuhao = Console.ReadLine();
                }
            }
        }
        public void result(double number1,string fuhao,double number2)
        {
            double result=0;
            switch(fuhao)
            {
                case "+":
                    result = number1 + number2;
                    Console.WriteLine("加法结果为：{0}", result);
                break;
                case "-":
                    result = number1 - number2;
                    Console.WriteLine("减法结果为：{0}", result);
                    break;
                case "*":
                    result = number1 * number2;
                    Console.WriteLine("乘法结果为：{0}", result);
                    break;
                case "/":
                    if (number2 != 0)
                    {
                        result = number1 / number2;
                        Console.WriteLine("除法结果为：{0}", result);
                    }
                    else
                    {
                        Console.WriteLine("除数不能为0！");
                    }
                    break;
                default:
                    break;

            }

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

            while (true)
            {
                count jisuan = new count();
                Console.Write("请输入第一个数字：");
                jisuan.Number1 = Convert.ToInt32(Console.ReadLine());
                Console.Write("请输入运算符：");
                jisuan.Fuhao = Console.ReadLine();
                Console.Write("请输入第二个数字：");
                jisuan.Number2 = Convert.ToInt32(Console.ReadLine());
                jisuan.result(jisuan.Number1, jisuan.Fuhao, jisuan.Number2);
                Console.ReadLine();
            }
            
        }
    }
}