namespace 工厂方法_计算器 {
/// <summary> /// 运算类 /// </summary> 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; } }
/// <summary> /// 得到运算结果 /// </summary> /// <returns></returns> public virtual double GetResult() { double result = 0; return result; } }
/// <summary> /// 加法类 /// </summary> class OperationAdd : Operation { public override double GetResult() { double result = 0; result = NumberA + NumberB; return result; } }
/// <summary>
/// 减法类
/// </summary>
class OperationSub : Operation
{
public override double GetResult()
{
double result = 0;
result = NumberA - NumberB;
return result;
}
}
/// <summary>
/// 乘法类
/// </summary>
class OperationMul : Operation
{
public override double GetResult()
{
double result = 0;
result = NumberA * NumberB;
return result;
}
}
/// <summary>
/// 除法类
/// </summary>
class OperationDiv : Operation
{
public override double GetResult()
{
double result = 0;
if (NumberB == 0)
throw new Exception("除数不能为0。
");
result = NumberA / NumberB;
return result;
}
}
/// <summary> /// 工厂方法 /// </summary> interface IFactory { Operation CreateOperation(); }
/// <summary> /// 专门负责生产“+”的工厂 /// </summary> class AddFactory : IFactory { public Operation CreateOperation() { return new OperationAdd(); } }
/// <summary> /// 专门负责生产“-”的工厂 /// </summary> class SubFactory : IFactory { public Operation CreateOperation() { return new OperationSub(); } }
/// <summary> /// 专门负责生产“*”的工厂 /// </summary> class MulFactory : IFactory { public Operation CreateOperation() { return new OperationMul(); } }
/// <summary> /// 专门负责生产“/”的工厂 /// </summary> class DivFactory : IFactory { public Operation CreateOperation() { return new OperationDiv(); } }
}
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