C# 简单工厂模式

static void Main(string[] args)
{
Console.WriteLine("NumberA:");
string NumberA = Console.ReadLine();
Console.WriteLine("NumberB:");
string NumberB = Console.ReadLine();
Console.WriteLine("运算符:");
string Symbol = Console.ReadLine();
Operation oper;
oper = OperationFactory.createOperate(Symbol);
oper.NumberA = Convert.ToDouble(NumberA);
oper.NumberB = Convert.ToDouble(NumberB);
double result = oper.GetResult();
Console.WriteLine("结果:"+ result);
}

 

//Operation 类

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; ;
}
}

//OperationAdd类

class OperationAdd : Operation
{
public override double GetResult()
{
double result = 0;
result = NumberA + NumberB;
return result;
}

}

 

//OperationSub类

class OperationSub : Operation
{
public override double GetResult()
{
double result = 0;
result = NumberA - NumberB;
return result;
}
}

 

//OperationMul类

class OperationMul : Operation
{
public override double GetResult()
{
double result = 0;
result = NumberA * NumberB;
return result;
}

}

 

//OperationFactory类

public class OperationFactory
{
public static Operation createOperate(string operate)
{
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;
}
}