封装逻辑用策略模式实现

运行结果：

策略封装代码：

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

namespace shuxuefudao
{  
    public interface ITaxStragety
        {
        int Calcul(int a,int b);
       
        }
   class Class2 : ITaxStragety
    {
      
      public  int Calcul(int a, int b)
        {
            return  a + b;
        }

    }
   class sub : ITaxStragety
    {
      public int Calcul(int a, int b)
       {
           return  a - b;
       }
   
   }
   class sheng : ITaxStragety
   {
      public int Calcul(int a, int b)
       {
           return a *b;
                       
       }
   
   }
    class chu : ITaxStragety
   {
     public int Calcul(int a, int b )
       {
           return a / b;

       }
   }
  
     class tiaoyong
    {                
         public int c=0;
         public int n=0;
         public void yunsuan(string m)
         { 
             if(m=="+")
             {
                 Class2 ss = new Class2();
                 ss.Calcul(c,n);
                                                  
             }
             if(m=="-")
             {
                 sub ww = new sub();
                 ww.Calcul(c,n);

                
             }
             if(m=="*")
             {
                 sheng qq = new sheng();
                 qq.Calcul(c,n);
                           
             }
             if(m=="/")
             {

                 chu pp = new chu();
                 pp.Calcul(c,n);
             
             }
         
         }
    }
}

　内容代码：

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;
using System.IO;





namespace shuxuefudao
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        string path = "E:
tf";
        public static int Count = 0;
        public static int zhengque = 0;
        public static int lefttime;
        public static int time;
        public static int sum;
        int i = 1;
        Class1 mm = new Class1();
        private void Form1_Load(object sender, EventArgs e)
        {
            if (File.Exists(path))
            {
                this.richTextBox1.LoadFile(path, RichTextBoxStreamType.RichText);
                open.Enabled = false;
            }
            save.Enabled = false;
        }
        private void open_Click(object sender, EventArgs e) //打开文件的方法
        {
            OpenFileDialog TxTOpenDialog = new OpenFileDialog();
            TxTOpenDialog.Filter = "RTF文件(*.RTF)|*.RTF";
            if (TxTOpenDialog.ShowDialog() == DialogResult.OK)
            {
                path = TxTOpenDialog.FileName;
                this.richTextBox1.LoadFile(TxTOpenDialog.FileName, RichTextBoxStreamType.RichText);
                save.Enabled = false;
                open.Enabled = false;
                MessageBox.Show("读取成功", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
        }

        private void save_Click(object sender, EventArgs e) //保存文件的方法
        {
            SaveFileDialog TxtSaveDialog = new SaveFileDialog();
            TxtSaveDialog.Filter = "RTF文件(*.RTF)|*.RTF";
            if (File.Exists(path))
            {

                this.richTextBox1.LoadFile(path, RichTextBoxStreamType.RichText);
                MessageBox.Show("保存成功", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
              
                save.Enabled = false;
            }
            else
            {
                if (TxtSaveDialog.ShowDialog() == DialogResult.OK)
                {

                    this.richTextBox1.SaveFile(TxtSaveDialog.FileName, RichTextBoxStreamType.RichText);
                    MessageBox.Show("保存成功", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                    
                    save.Enabled = false;
                }
            }
        }

        private void richTextBox1_TextChanged(object sender, EventArgs e)
        {
            save.Enabled = true;
            if (this.richTextBox1.Text == "" || this.richTextBox1.Text == null)
            {
                open.Enabled = true;
            }
        }
        public void shizi() //编写试题的方法
        { 
                left.Text = "";
                fuhao.Text = "";
                right.Text = "";   
        }
        private void open2_Click(object sender, EventArgs e) //打开试题的方法
        {
            OpenFileDialog TxTOpenDialog = new OpenFileDialog();
            TxTOpenDialog.Filter = "RTF文件(*.RTF)|*.RTF";
            if (TxTOpenDialog.ShowDialog() == DialogResult.OK)
            {
                path = TxTOpenDialog.FileName;
                this.richTextBox2.LoadFile(TxTOpenDialog.FileName, RichTextBoxStreamType.RichText);
                save.Enabled = false;
                open.Enabled = false;
                MessageBox.Show("导入成功", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
        }

        private void daoru_Click(object sender, EventArgs e) //导入试题的方法
        {
            richTextBox2.Text = richTextBox1.Text;
        }

        private void daan1_Click(object sender, EventArgs e)
        {
            if (daan1.Text == "显示答案")
            {
                daan.PasswordChar = Convert.ToChar(0);
                daan1.Text = "隐藏答案";
            }
            else if (daan1.Text == "隐藏答案")
            {
                daan.PasswordChar = '.';
                daan1.Text = "显示答案";

            }
        }

        private void kaishi_Click(object sender, EventArgs e)
        {

            string[] ll = new string[100];
            ll = File.ReadAllLines("writer.txt");
            textBox1.Text = ll[0];

            string[] lli = new string[100];
            lli = File.ReadAllLines("writer1.txt");
            textBox2.Text = lli[0];

            string[] llp = new string[100];
            llp = File.ReadAllLines("writer2.txt");
            textBox3.Text = llp[0];
          
           
            int minute;
            try
            {
                minute = int.Parse(this.shijian.Text);
            }
            catch (System.Exception ex)
            {
                this.shijian1.Text = "输入错误";
                return;
            }
            lefttime = minute;
            this.timer1.Interval = 1000;
            this.timer1.Enabled = true;
            this.timer1.Start();
           
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            if (lefttime <= 0)
            {
                timer1.Enabled = false;
                MessageBox.Show("答题时间到！");
                Form2 frm2 = new Form2();
                frm2.ShowDialog();
                
            }
            this.shijian1.Text = "剩余时间" + lefttime.ToString() + "秒";
            lefttime--; 
        }

        private void jieshu_Click(object sender, EventArgs e)
        {
            Form2 frm2 = new Form2();
            frm2.ShowDialog();
        }

        private void button1_Click(object sender, EventArgs e) //请编辑下道题的事件
        { 
            Count++;
            ti.Text = Count.ToString();
            StreamWriter writer = File.AppendText("writer.txt");
           writer.WriteLine(left.Text);
            writer.Close();
            StreamWriter writer1 = File.AppendText("writer1.txt");
            writer1.WriteLine(fuhao.Text);
            writer1.Close();
            StreamWriter writer2 = File.AppendText("writer2.txt");
            writer2.WriteLine(right.Text);
            writer2.Close();
            richTextBox1.Text += left.Text + fuhao.Text + right.Text + label2.Text + "" + "
";
            //mm.m= int.Parse(left.Text);
            //mm.n = int.Parse(right.Text);
            daan.Text = Convert.ToString(mm.c);
            daan.Text += sum + "
";
            tiaoyong ee = new tiaoyong();
            ee.c = int.Parse(left.Text);
            ee.n = int.Parse(right.Text);
            string a = Convert.ToString(mm.m);
            ee.yunsuan(a);
            //left.Text="";
            //right.Text = "";
            //fuhao.Text = "";
            //mm.a = left.Text;
            //mm.b = right.Text;
            //mm.d = fuhao.Text;      
            //mm.Calue();
        //    string f = fuhao.Text;
        //    switch (f)
        //    {
        //        case "+":
        //            sum = int.Parse(left.Text) + int.Parse(right.Text);
        //            daan.Text += sum + "
";
        //            shizi();

        //            break;
        //        case "-":
        //            sum = int.Parse(left.Text) - int.Parse(right.Text);
        //            shizi();
        //            daan.Text += sum + "
";
        //            break;
        //        case "×":
        //            sum = int.Parse(left.Text) * int.Parse(right.Text);
        //            shizi();
        //            daan.Text += sum + "
";
        //            break;
        //        case "÷":
        //            sum = int.Parse(left.Text) / int.Parse(right.Text);
        //            shizi();
        //            daan.Text += sum + "
";
        //            break;
        //        default:
        //            break;

        //    }
        }
        private void textBox4_KeyDown(object sender, KeyEventArgs e)
        {

            string m = textBox2.Text;
            int result;
            switch (m)
            {
                case "+":
                    sum = int.Parse(textBox1.Text) + int.Parse(textBox3.Text);

                    break;
                case "-":
                    sum = int.Parse(textBox1.Text) - int.Parse(textBox3.Text);
                    break;
                case "*":
                    sum = int.Parse(textBox1.Text) * int.Parse(textBox3.Text);
                    break;
                case "/":
                    sum = int.Parse(textBox1.Text) / int.Parse(textBox3.Text);
                    break;
                default:
                    break;
        }
            if (e.KeyCode == Keys.Enter)
            {

                if (int.TryParse(textBox4.Text, out result) == false)
                {
                    MessageBox.Show("请输入数字");

                }
                if (textBox4.Text == sum.ToString())
                {

                    MessageBox.Show("回答正确");
                    zhengque++;

                }
                else
                {

                    MessageBox.Show("回答错误");
                }
               
               
                textBox4.Clear();

                string[] ll = new string[100];
                ll = File.ReadAllLines("writer.txt");
                textBox1.Text = ll[i];
                string[] lli = new string[100];
                lli = File.ReadAllLines("writer1.txt");
                textBox2.Text = lli[i];
                string[] llp = new string[100];
                llp = File.ReadAllLines("writer2.txt");
                textBox3.Text = llp[i];
                i++;

            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            File.WriteAllText("writer.txt", string.Empty);
            File.WriteAllText("writer1.txt", string.Empty);
            File.WriteAllText("writer2.txt", string.Empty);
        }
 
    }
}