计算器之策略模式

❶在WinForm里实现策略模式

一、代码实现

Form1代码

namespace szys
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
     
        public static int right = 0;
        public static int Count = 0;
        private int t;
        string path = ".	ext1.txt";
        int a = 0;
        private void button5_Click(object sender, EventArgs e)
        {
           
            Count++;
            StreamWriter baocun1 = File.AppendText("baocun1.txt");
            baocun1.WriteLine(textBox1.Text);
            baocun1.Close();
            StreamWriter baocun2 = File.AppendText("baocun2.txt");
            baocun2.WriteLine(textBox4.Text);
            baocun2.Close();
            StreamWriter baocun3 = File.AppendText("baocun3.txt");
            baocun3.WriteLine(textBox2.Text);
            baocun3.Close();
            richTextBox1.Text += textBox1.Text + textBox4.Text + textBox2.Text + label2.Text + textBox3.Text + "
";
            textBox1.Clear();
            textBox4.Clear();
            textBox2.Clear();

        }
        private void btnsave_Click(object sender, EventArgs e)//保存已出试题;
        {
            SaveFileDialog TxtSaveDialog = new SaveFileDialog();
            TxtSaveDialog.Filter = "文本文档(*.txt)|*.txt";
            if (File.Exists(path))
            {

                this.richTextBox1.LoadFile(path, RichTextBoxStreamType.PlainText);
                MessageBox.Show("保存成功", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                this.richTextBox1.Clear();
                btnsave.Enabled = false;

            }
            else
            {
                if (TxtSaveDialog.ShowDialog() == DialogResult.OK)
                {

                    this.richTextBox1.SaveFile(TxtSaveDialog.FileName, RichTextBoxStreamType.PlainText);
                    MessageBox.Show("保存成功", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                    this.richTextBox1.Clear();
                    btnsave.Enabled = false;
                    button1.Visible = true;
                }

            }
        }
        private void button1_Click(object sender, EventArgs e)//打开试题;
        {
           

            OpenFileDialog TxTOpenDialog = new OpenFileDialog();
            TxTOpenDialog.Filter = "文本文档(*.txt)|*.txt";
            if (TxTOpenDialog.ShowDialog() == DialogResult.OK)
            {
                path = TxTOpenDialog.FileName;
                this.richTextBox2.LoadFile(TxTOpenDialog.FileName, RichTextBoxStreamType.PlainText);
                btnsave.Enabled = false;
                button1.Enabled = false;
                MessageBox.Show("打开成功", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);


            }

        }
        private void button2_Click(object sender, EventArgs e)//添加算式题;
        {
           
            textBox1.Enabled = false;
            textBox2.Enabled = false;
            textBox4.Enabled = false;
            textBox1.BackColor = Color.Yellow;
            textBox4.BackColor = Color.Yellow;
            textBox2.BackColor = Color.Yellow;
            textBox3.BackColor = Color.Yellow;
            string[] m = new string[100];
            m = File.ReadAllLines("baocun1.txt");
            textBox1.Text = m[a];
            string[] n = new string[100];
            n = File.ReadAllLines("baocun2.txt");
            textBox4.Text = n[a];
            string[] v = new string[100];
            v = File.ReadAllLines("baocun3.txt");
            textBox2.Text = v[a];
            a++;

        }

        private void textBox3_MouseClick(object sender, MouseEventArgs e)//计时;
        {
            label3.Text = t.ToString();
            timer1.Enabled = true;
            timer1.Interval = 1000;
            timer1.Start();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            t = t + 1;
            label3.Text = t.ToString();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            MessageBox.Show("一共用时" + label3.Text + "秒");
            Form2 frm2 = new Form2();
            frm2.ShowDialog();
        }

        private void button4_Click(object sender, EventArgs e)
        {
            //调用;
            szys.celuemoshi.Sub.yunsuanfu clacuter = new szys.celuemoshi.Sub.yunsuanfu(textBox4.Text);
            int result = clacuter.Calculation(int.Parse(textBox1.Text), int.Parse(textBox2.Text));
               
            if (textBox3.Text==result.ToString())
                {
                    MessageBox.Show("恭喜你，小朋友！回答正确！");
                    right++;
                    Count++;
                }

                else
                {

                    MessageBox.Show("回答错误，继续加油！小朋友");
                    Count++;
                    
                }
                textBox1.Clear();
                textBox2.Clear();
                textBox3.Clear();
                textBox4.Clear();

            }

       
        }
    }

Form2代码

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

namespace szys
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private void Form2_Load(object sender, EventArgs e)
        {
            textBox1.Text = Form1.Count.ToString();
            textBox2.Text = Form1.right.ToString();
            textBox4.Text = ((Form1.right / (double)(Form1.Count)) * 100).ToString() + "%";

        }

     }
 }

 策略模式代码

namespace szys
{
    class celuemoshi
    {
 
         interface Strategy //定义一个Strategy接口;

        {
            int  calculate(int n1, int n2);//定义一个方法，用于计算；

        }
        class Add : Strategy  //定义具体的算法类，实现Strategy接口
        {
             public  int calculate(int n1, int n2)
            {
                
                return  n1 + n2;;
            }
        }

        class Sub : Strategy
        {
            public  int calculate(int n1, int n2)
            {
                
                return n1 - n2; ;
            }

         class Mul : Strategy
            {
                public  int calculate(int n1, int n2)
                {
                    return n1 * n2; ;
                }
            }
          class Div : Strategy
            {
                public  int calculate(int n1, int n2)
                {
                    
                    return  n1 / n2; ;
                }
            }
           


            public class yunsuanfu
            {
                private Strategy type;
                public yunsuanfu(string a)
                {
                    
                    switch (a)
                    {
                        case "+":
                            type = new Add();
                            break;
                        case "-":
                            type = new Sub();
                            break;
                        case "*":
                            type = new Mul();
                            break;
                        case "/":
                            type = new Div();
                            break;

                    }
                 
                }
                public int Calculation(int n1, int n2)
                {
                    return type.calculate(n1, n2);
                }

            }
        }
    }

二、测试

❷在ASP.NET里实现策略模式

一、具体代码

策略模式代码

using System;
using System.Collections.Generic;
using System.Web;

/// <summary>
///Class1 的摘要说明
/// </summary>

    public interface Calculator //定义一个接口
    {
        int Cal(int n1, int n2);//定义一个方法，用于计算； 
    }
    public class Add : Calculator  //定义具体的算法类，实现Calculator接口
    {
        public int Cal(int n1, int n2)
        {
            int result = 0;
            result = n1 + n2;
            return result;
        }
    }
    public class Sub : Calculator 
    {
        public int Cal(int n1, int n2)
        {
            int result = 0;
            result = n1 - n2;
            return result;
        }
    }
    public class Mul : Calculator  
    {
        public int Cal(int n1, int n2)
        {
            int result = 0;
            result = n1 * n2;
            return result;
        }
    }
    public class Div : Calculator  
    {
        public int Cal(int n1, int n2)
        {
            int result = 0;
            result = n1 / n2;
            return result;
        }
    }
    public class Content     
    {
        private Calculator calculate;
        public Content(Calculator calculate)
        {
            this.calculate = calculate;
        }
        public int Cal(int n1, int n2, String m) 
        {
            return this.calculate.Cal(n1, n2);
        }
    }

Default2.aspx.cs代码

public partial class Chapter1_Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
      
    }
    int a = 0;
    private int t;
    public static int Count=0;
    public static  int right=0;
    protected void Button1_Click(object sender, EventArgs e)
    {
      
            Content content = null;
            int a = int.Parse(TextBox1.Text); 
            int b = int.Parse(TextBox3.Text);
            string m = TextBox2.Text;
            switch (m)
            {
                case "+":
                    content = new Content(new Add()); 
                    break;
                case "-":
                    content = new Content(new Sub());

                    break;
                case "*":
                    content = new Content(new Mul());

                    break;
                case "/":
                    content = new Content(new Div());

                    break;
                default:
                    break;
            }

            string answer = content.Cal(a, b, m).ToString();

            if (TextBox4.Text == answer.ToString())
            {
                Label1.Text = ("恭喜你，小朋友！回答正确！");
                Label1.ForeColor = Color.Blue;
                right++;

            }
            else
            {
                Label1.Text = ("回答错误，继续加油！小朋友");
                Label1.ForeColor = Color.Red;

            }

        }
  
    protected void Button2_Click(object sender, EventArgs e)
    {
        Count++;
        StreamWriter baocun1 = File.AppendText("C:\baocun1.txt");
        baocun1.WriteLine(TextBox1.Text);
        baocun1.Close();
        StreamWriter baocun2 = File.AppendText("C:\baocun2.txt");
        baocun2.WriteLine(TextBox2.Text);
        baocun2.Close();
        StreamWriter baocun3 = File.AppendText("C:\baocun3.txt");
        baocun3.WriteLine(TextBox3.Text);
        baocun3.Close();
        ListBox1.Items.Add(TextBox1.Text + TextBox2.Text + TextBox3.Text + "=");
        TextBox1.Text = "";
        TextBox2.Text = "";
        TextBox3.Text = "";
    }
    protected void Button3_Click(object sender, EventArgs e)
    {
        TextBox1.BackColor = Color.Yellow;
        TextBox2.BackColor = Color.Yellow;
        TextBox3.BackColor = Color.Yellow;
        TextBox4.BackColor = Color.Yellow;
        TextBox1.Enabled = false;
        TextBox2.Enabled = false;
        TextBox3.Enabled = false;
        string[] m = new string[100];
        m = File.ReadAllLines("C:\baocun1.txt");
        TextBox1.Text = m[a];
        string[] n = new string[100];
        n = File.ReadAllLines("C:\baocun2.txt");
        TextBox2.Text = n[a];
        string[] v = new string[100];
        v = File.ReadAllLines("C:\baocun3.txt");
        TextBox3.Text = v[a];
        a++;
        
        
        
    }

    protected void Button4_Click(object sender, EventArgs e)
    {
        TextBox1.Text = "";
        TextBox2.Text = "";
        TextBox3.Text = "";
        TextBox4.Text = "";
        Label1.Text = "";
    }
    protected void Button5_Click(object sender, EventArgs e)
    {
        Label6.Text = "总计";
        Label7.Text = "正确";
        Label8.Text = "正确率";
        Label3.Text = Count.ToString();
        Label4.Text = right.ToString();
        Label5.Text = ((right / (double)(Count)) * 100).ToString() + "%";
    }
   
    
}

二、测试

三、总结

     上课老师给我们讲过策略模式，但还是半懂不懂的，当用策略模式做这个计算器的时候，上网查了很多资料，也看了同学的博客，才对策略模式有了概念：它就是定义了一系列的算法，并将每一个算法封装起来，而且使它们还可以相互替换。它让算法的变化不会影响到使用算法的客户。

     首先定义一个Strategy接口，其中定义一个方法，用于计算。

public interface Strategy
{
    public int calculate(int a, int b);

}

          定义具体的算法类，实现Strategy接口

public class Add: Strategy
{
    public int calculate(int a, int b)
    {        
        return a + b;
    }
}

        定义具体上下文环境，维护Strategy引用

public class Context {
   private Strategystrategy;
   public Context(Strategy strategy) {
      this.strategy = strategy;
   }
   public void contextInterface() {
      strategy.algorithmInterface();
   }
}

         客户端代码.

      Context context;
      context = new Context(new Add());
      context.contextInterface();
      context = new Context(new Sub());
      context.contextInterface();
      context = new Context(new Mul());
      context.contextInterface();
      context = new Context(new Div());
      context.contextInterface();

 

策略模式由下面几项的组成

　　 （1）抽象策略角色： 策略类，通常由一个接口或者抽象类实现。

　　 （2）具体策略角色：包装了相关的算法和行为。

　　 （3）环境角色：持有一个策略类的引用，最终给客户端调用。

     使用策略模式的好处就是它简化了单元测试，因为每个算法都有自己的类，可以通过自己的接口单独测试。还避免了程序中使用多重条件语句，使系统更灵活，并易于扩展。