29、面向对象设计模式之简单工厂模式-具体实现

基本实现：

　　

public abstract class Product{
    
    
}

public class ConcretProduct:Product{
    
    
}

public class Factory{
    
    public static Product CreateProduct(){
        
        return new ConcretProduct();
    }
}

class Program{
    
    static void Main(string[] args){
        
        Product product = Factory.CreateProduct();
        Console.WriteLine("Created:{0}",product.GetType().Name);
    }
}
    

简单提升

　　实现加减乘除未用工厂模式

　　

public class Operation{
    
    public static double GetResult(double numberA,double numberB, string operate){
        
        double result = 0;
        switch(operate){
            
            case "+":
                result = numberA + numberB；
                break;
            case "-":
                result = numberA - numberB;
                break;
            case "*"
                result = numberA * numberB;
                break;
            case "/"
                result = numberA / numberB;
                break;
        }
        return result;
    }
}

class Program{
    
    static void Main(string[] args){
        
        try
        {
            Console.WriteLine("输入数字：")
            string stringNumberA = Console.ReadLine();
            Console.WriteLine("请输入运算符号: +, - *, / 
");
            string stringOperate = Console.ReadLine();
            Console.WriteLine("请在输入一个数：")；
            string stringNumberB = Console.ReadLine();
            string stringResult = Convert.ToString(Operation.GetResult(Convert.ToDouble(stringNumberA),
            Convert.ToDouble(stringNumberB),Convert.ToString(stringOperate)));
            Console.WriteLine("结果是：" + stringResult);
            
        }catch(Exception ex){
            Console.WriteLine("你输入有错：",ex.Message);
        }
        Operation.GetResult(2.4,2.5, "+")
    }
}

　　实现加减乘除使用简单工厂模式

public class Operation{
    
    private  double numberA = 0;
    private double numberB = 0;
    public double NumberA{
        
        get { return numberA;}
        set {numberA = value;}
    }
    public double NumberB{
        get {return numberB;}
        set {numberB = value;}
    }
    public virtual double GetResult(){
        double result = 0;
        return result;
    }
}
public class OperationAdd:Operation{
    
    public override double GetResult{
        double result = 0;
        result = numberA + numberB;
        return result;
    }
}
public class OperationSub:Operation{
    
    public override double GetResult(){
        
        double result = 0;
        result = numberA - numberB;
        return result;
    }
}
public class OperationMultiply:Operation{
    public override double GetResult(){
        double result = 0;
        result = numberA * numberB;
        return result;
    }
}
public class OperationDivide:Operation{
    public override double GetResult(){
        double result = 0;
        result = numberA / numberB;
        if(0==numberB){
            throw new Exception("除数不能为零");
        }
        return result;
    }
}
public class OperationFactory{
    
    public static Operation CreateOperation(string operate){
        Operation operation = null;
        switch(operate){
            case "+":
                operation = new OperationAdd();
                break;
            case "-":
                operation = new OperationSub();
                break;
            case "*":
                operation = new OperationMultiply();
                break;
            case "/":
                operation = new OperationDivide();
                break;
        }
        return operation;
    }
}
class Program{
    
    static void Main(string[] args){
        Operation oper;
        
        oper = OperationFactory.CreateOperation("+");
        oper.NumberA = 1;
        oper.NumberB = 2;
        oper.GetResult();
        
    }
}