对大话设计模式的学习1-简单工厂模式

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace APP设计模式Test1计算器
{
    public partial class 简单工厂 : Form
    {
        public 简单工厂()
        {
            InitializeComponent();
        }

        //运算
        private void button1_Click(object sender, EventArgs e)
        {
            string sign = textBox3.Text;
            Operation oper;
            oper = OperationFactory.CreateOperation(sign);
            oper.IsertA = Convert.ToInt32(textBox1.Text);
            oper.IsertB = Convert.ToInt32(textBox2.Text);
            textBox4.Text = oper.GetResult().ToString();
        }
     
        //重置
        private void button2_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
            textBox2.Text = "";
            textBox3.Text = "";
            textBox4.Text = "";
        }

        private void 简单工厂_Load(object sender, EventArgs e)
        {

        }
    }
    //运算类
    public class Operation
    {
        private int insertA, insertB;
        public int IsertA
        {
            get
            {
                return insertA;
            }
            set
            {
                this.insertA = value;
            }
        }
        public int IsertB
        {
            get
            {
                return insertB;
            }
            set
            {
                this.insertB = value;
            }
        }
        public virtual int GetResult()
        {
            int result=0;
            return result;
        }
    }
    //减法类
    public class OperationSub:Operation
    {
        public override int GetResult()
        {             
            int result = 0;
            result = IsertA - IsertB;
            return result;
        }
    }
    //加法类
    public class OperationPul:Operation
    {
        public override int GetResult()
        {
            int result = 0;
            result = IsertA + IsertB;
            return result;
        }
    }
    //简单运算工厂类
    public class OperationFactory
    {
        public static Operation CreateOperation(string operate)
        {
            Operation oper = null;
            switch(operate)
            {
                case "-":
                    oper=new OperationSub();
                    break;
                case "+":
                    oper=new OperationPul();
                    break;
            }
            return oper;
        }
    }
}