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  • 简单工厂模式

        /// <summary>
        /// 运算类
        /// </summary>
        class Operation
        {
            private double _numberA = 0;
            private double _numberB = 0;
            
            /// <summary>
            /// 数字A
            /// </summary>
            public double NumberA
            {
                get{ return _numberA; }
                set{ _numberA = value;}
            }
    
            /// <summary>
            /// 数字B
            /// </summary>
            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>
        /// 运算类工厂
        /// </summary>
        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;
            }
        }
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  • 原文地址:https://www.cnblogs.com/suzixuan/p/7044781.html
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