大话设计模式代码简单工厂

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public class Operation

{

public double NumberA=0;

public double NumberB=0;

public virtual double GetResult()

{

double result = 0;

return result;

}

}

class OperationAdd:Operation

{

public override double GetResult()

{

double result=0;

result=NumberA+NumberB;

return result;

}

}

class OperationSub:Operation

{

public override double GetResult()

{

double result=0;

result=NumberA-NumberB;

return result;

}

}

class OperationMul:Operation

{

public override double GetResult()

{

double result=0;

result=NumberA*NumberB;

return result;

}

}

class OperationDiv:Operation

{

public class override double GetResult()

{

double result=0;

if(NumberB==0)

{

throw new Exception("除数不能为0");

}

result=NumberA/NumberB;

return result;

}

}

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 OperationSub();

break;

}

return oper;

　　}

}

Operation oper;

oper=OperationFactory.createOperate("+");

oper.NumberA=1;

oper.NumberB=2;

double result=oper.GetResult();

大话设计模式代码简单工厂

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原文地址：http://www.cnblogs.com/futengsheng/p/5480643.html