C# 设计模式，简单工厂

C# 实现计算机功能 （封装，继承，多态）

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

 namespace 简单工厂 {
     class Program {

         static void Main(string[] args) {
             Operation op = Facotry.createFactory("+");
             op.Number1 = ;
             op.Number2 = ;
             int result = op.getResult();
             Console.WriteLine(op.ToString());
             Console.ReadKey();
         }
         class Operation { //父类，封装
             protected int number1;
             protected int number2;

             public int Number1 {
                 get { return number1; }
                 set { number1 = value; }
             }
             public int Number2 {
                 get { return number2; }
                 set { number2 = value; }
             }
             public virtual int getResult() {
                 int result = ;
                 return result;
             }
         }
         class OperationAdd : Operation {
             public override int getResult() {
                 return number1 + number2;
             }
         }

         class OperationSub : Operation {
             public override int getResult() {
                 return number1-number2;
             }
         }

         class Facotry {
             public static Operation createFactory(string ope) {
                 Operation op = null;
                 switch (ope) {
                     case "+":
                         op = new OperationAdd();
                         break;
                     case "-":
                         op = new OperationSub();
                         break;
                 }
                 return op;
             }
         }
     }
 }