设计模式 之 简单工厂模式

1〉创建抽象类：

2〉各业务类继承抽象类，重写抽象类业务方法；

3〉业务工厂类根据传的业务类型，反回相应的各业务类对象；

4>客户端根据反回相应的各业务类对象赋值,调用相应的方法,反回值.

例如：计算器:输入两个数，一个运算符，反回结果

1〉创建抽象类：

class Operation

{

  public double NumberA{get;set;}

  public double NumberB{get;set;}

  public viratul double GetResult()

  {

   double result=0;

   return result;

  }

}

2〉各业务类:

class OperationAdd:Operation

{

  public ovrried double GetResult()

  {

   double result=0;

   result=NumberA + NumberB;

   return result;

  }

}

 

 

class OperationSub:Operation

{

  public ovrried double GetResult()

  {

   double result=0;

   result=NumberA - NumberB;

   return result;

  }

}

 

3〉业务工厂类

class OperationFactory

{

  public viratul Operation CreateOperation(string operation)

   {

      Operation oper=null;

      switch(operation)

        {

            case"+":

                 {

                       oper=new OperationAdd();

                        break;

                 }

 

            case"-":

                 {

                       oper=new OperationSub();

                        break;

                 }

        }

     return oper;

   }

}

 

4>客户端

Operation oper=null;

   oper=new OperationFactory("+");

   oper.NumberA=1;

   oper.NumberB=2;

   double result=  oper.GetResult();

  Console.Write("result is "+result);