1.大话设计模式-简单工厂模式

编程时一门技术，更是一门艺术

简单工厂模式利用面向对象方式通过继承、封装、多态把程序的耦合度降低，设计模式使得程序更加灵活，容易修改，易于复用。

下面是服务器计算器代码：

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace DesignModel
 8 {
 9     /// <summary>
10     /// 计算器
11     /// </summary>
12     public class Calculator   //创建一个计算器的基类可以接受两个参数，任何算法只需重写计算结果方法即可。
13     {
14         private double _numberA;
15         private double _numberB;
16 
17         public double NumberA
18         {
19             get { return this._numberA; }
20             set { this._numberA = value; }
21         }
22         public double NumberB
23         {
24             get { return this._numberB; }
25             set { this._numberB = value; }
26         }
27         public virtual double GetResult()
28         {
29             double result = 0;
30             return result;
31         }
32     }
33     /// <summary>
34     /// 加法
35     /// </summary>
36     public class Add : Calculator    //每添加一种计算方式只需添加一个计算类并重写基类方法即可
37     {
38         public override double GetResult()
39         {
40             return  NumberA + NumberB;
41         }
42     }
43     /// <summary>
44     /// 减法
45     /// </summary>
46     public class Sub : Calculator
47     {
48         public override double GetResult()
49         {
50             return NumberA + NumberB;
51         }
52     }
53 
54     /// <summary>
55     /// 计算器工厂
56     /// </summary>
57     public class CalculatorFactory
58     {
59         public static Calculator GetResult(string oper)
60         {
61             Calculator calcu = null;
62             switch (oper)
63             {
64                 case "+":
65                     calcu = new Add();
66                     break;
67                 case "-":
68                     calcu = new Sub();
69                     break;
70             }
71             return calcu;
72         }
73 
74     }
75 
76 
77 }

计算器类

 1  static void Main(string[] args)
 2         {
 3             Console.WriteLine("请输入数字A：");
 4             string numbera = Console.ReadLine();
 5             Console.WriteLine("请输入运算符：");
 6             string oper = Console.ReadLine();
 7             Console.WriteLine("请输入数字B：");
 8             string numberb = Console.ReadLine();
 9 
10             Calculator c = CalculatorFactory.GetResult(oper);
11             c.NumberA = Convert.ToDouble(numbera);
12             c.NumberB = Convert.ToDouble(numberb);
13             Console.WriteLine(string.Format("{0}{1}{2}={3}", numbera, oper, numberb, c.GetResult()));
14             Console.ReadLine();
15         }

客户端调用

基本验证没加，学习练习的同学可以自己加上

28种设计模式后续更新

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

namespace DesignModel
{
    /// <summary>
    /// 计算器
    /// </summary>
    public class Calculator   //创建一个计算器的基类可以接受两个参数，任何算法只需重写计算结果方法即可。
    {
        private double _numberA;
        private double _numberB;

        public double NumberA
        {
            get { return this._numberA; }
            set { this._numberA = value; }
        }
        public double NumberB
        {
            get { return this._numberB; }
            set { this._numberB = value; }
        }
        public virtual double GetResult()
        {
            double result = 0;
            return result;
        }
    }
    /// <summary>
    /// 加法
    /// </summary>
    public class Add : Calculator    //每添加一种计算方式只需添加一个计算类并重写基类方法即可
    {
        public override double GetResult()
        {
            return NumberA + NumberB;
        }
    }
    /// <summary>
    /// 减法
    /// </summary>
    public class Sub : Calculator
    {
        public override double GetResult()
        {
            return NumberA + NumberB;
        }
    }

    /// <summary>
    /// 计算器工厂
    /// </summary>
    public class CalculatorFactory
    {
        public static Calculator GetResult(string oper)
        {
            Calculator calcu = null;
            switch (oper)
            {
                case "+":
                    calcu = new Add();
                    break;
                case "-":
                    calcu = new Sub();
                    break;
            }
            return calcu;
        }

    }

}