计算器-面向对象-工厂

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

namespace Windows_ji_suan_qi
{
    public partial class Form1 : Form

    {
        
        public Form1()
        {
            
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        
        private void button3_Click(object sender, EventArgs e)       //输入数字1
        {
            textBox1.Text = textBox1.Text + 1;
        }

        private void button4_Click(object sender, EventArgs e)           //输入数字2
        {
            textBox1.Text = textBox1.Text + 2;
        }

        private void button5_Click(object sender, EventArgs e)         //输入数字3
        {
            textBox1.Text = textBox1.Text + 3;
        }

        private void button6_Click(object sender, EventArgs e)         //输入数字4
        {
            textBox1.Text = textBox1.Text + 4;
        }

        private void button7_Click(object sender, EventArgs e)        //输入数字5
        {
            textBox1.Text = textBox1.Text + 5;
        }

        private void button8_Click(object sender, EventArgs e)      //输入数字6
        {
            textBox1.Text = textBox1.Text + 6;
        }

        private void button11_Click(object sender, EventArgs e)          //输入数字7
        {
            textBox1.Text = textBox1.Text + 7;
        }

        private void button10_Click(object sender, EventArgs e)         //输入数字8
        {
            textBox1.Text = textBox1.Text + 8;
        }

        private void button9_Click(object sender, EventArgs e)     //输入数字9
        {
            textBox1.Text = textBox1.Text + 9;
        }

        private void button1_Click(object sender, EventArgs e)      //输入数字0
        {
            textBox1.Text = textBox1.Text + 0;
        }

        private void button2_Click(object sender, EventArgs e)        //输入 点
        {
            textBox1.Text = textBox1.Text + ".";
        }

        private void textBox1_TextChanged_1(object sender, EventArgs e)         //设置长度 为16
        {
            textBox1.MaxLength = 16;
        }

        private void button14_Click(object sender, EventArgs e)　　　　　　　　//清零按钮
        {
            oper.NumberA = 0;
            oper.NumberB = 0;
            textBox1.Text = "";
            textBox1.Focus();
        }

        private void button12_Click(object sender, EventArgs e)        //撤销按键
        {
            string temp = null;
            temp = textBox1.Text;
            if (temp.Length < 1)
                return;
            textBox1.Text = temp.Substring(0, temp.Length - 1);


        }

        private void button13_Click(object sender, EventArgs e)    //按钮+
        {
            oper.NumberA = Convert.ToDouble(textBox1.Text);   //转换变量 并赋值
            textBox1.Text = "";            //置空
            textBox1.Focus();             //聚焦
            oper = OperationFactory.createOperate("+");      //传值 
        }

        private void button15_Click(object sender, EventArgs e)//按钮-
        {
            oper.NumberA = Convert.ToDouble(textBox1.Text);
            textBox1.Text = "";
            textBox1.Focus(); 
            oper = OperationFactory.createOperate("-");
        }
        private void button16_Click(object sender, EventArgs e) //按钮*
        {
            oper.NumberA = Convert.ToDouble(textBox1.Text);
            textBox1.Text = "";
            textBox1.Focus(); 
            oper = OperationFactory.createOperate("*");

        }

        private void button17_Click(object sender, EventArgs e)  //按钮 ／
        {
            oper.NumberA = Convert.ToDouble(textBox1.Text);
            textBox1.Text = "";
            textBox1.Focus(); 
            oper = OperationFactory.createOperate("/");
        }
        private void button18_Click(object sender, EventArgs e)　　//按钮＝
        {
            oper.NumberB = Convert.ToDouble(textBox1.Text);

            double result = oper.GetResult();
            textBox1.Text = result.ToString();
        }


        /**/
        ///<summary>
        ///运算类工厂
        ///</summary>
        Operation oper = new Operation();
        public class OperationFactory
        {
            public static Operation createOperate(string operate)
            {
                /*
                 只有用了static后才能OperationFactory.createOperate("-");

                不然要先OperationFactory a=new OpertationFactory();
                  a.cerateOperate("-");
                */
                Operation oper = null;
                switch (operate)
                {
                    case "+":
                        oper = new OperationAdd();
                        break;
                    case "-":
                        oper = new OperationSub();
                        break;
                    case "*":
                        oper = new OperationMul();
                        break;
                    case "/":
                        oper = new OperationDiv();
                        break;

                }
                return oper;
            }
        }
        /**/
        ///<summary>
        ///运算类
        ///</summary>
        public class Operation
        {
            private static double _numberA = 0;
            private static double _numberB = 0;
            /**/
            ///<summary>
            ///数字A
            ///</summary>
            public  double NumberA
            {
                get { return _numberA; }
                set { _numberA = value; }
            }
            ///<summary>
            ///数字B
            ///</summary>
            public  double NumberB
            {
                get { return _numberB; }
                set { _numberB = value; }
            }
            ///<summary>
            ///得到运算结果
            ///</summary>
            ///<returns></returns>
            public virtual double GetResult()
            {
                double result = 0;
                return result;
            }
        }

        ///<summary>
        ///加法类
        ///</summary>
        class OperationAdd : Operation
        {
            public override double GetResult()
            {
                double result = 0;
                result = NumberA + NumberB;
                return result;
            }

        }

        ///<summary>
        ///减法类
        ///</summary>
        class OperationSub : Operation
        {
            public override double GetResult()
            {
                double result = 0;
                result = NumberA - NumberB;
                return result;

            }

        }
        ///<summary>
        ///乘法类
        ///</summary>
        class OperationMul : Operation
        {
            public override double GetResult()
            {
                double result = 0;
                result = NumberA * NumberB;
                return result;
            }
        }
        ///<summary>
        ///除法类
        ///</summary>
        class OperationDiv : Operation
        {
            public override double GetResult()
            {
                double result = 0;
                if (NumberB == 0)           //判断除数是否为0
                {
                    MessageBox.Show("输入的除数不能为0，请重新输入！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    
                }
                result = NumberA / NumberB;
                return result;
            }
        }

    

        private void Form1_FormClosing(object sender, FormClosingEventArgs e) //退出 按钮
        {
            DialogResult aaa = MessageBox.Show("真的要退出吗？", "退出", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning);
            if (aaa == DialogResult.Cancel)
          
                e.Cancel = true;
           
        }

       
    }

    
}