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第1章 简单工厂模式
应用层：
using System;using System.Collections.Generic;using System.Text;using OperationLibrary;namespace 计算器控制台{ class Program { static void Main(string[] args) { try { Console.Write("请输入数字A："); string strNumberA = Console.ReadLine(); Console.Write("请选择运算符号(+、-、*、/)："); string strOperate = Console.ReadLine(); Console.Write("请输入数字B："); string strNumberB = Console.ReadLine(); string strResult = ""; Operation oper; oper = OperationFactory.createOperate(strOperate); oper.NumberA = Convert.ToDouble(strNumberA); oper.NumberB = Convert.ToDouble(strNumberB); strResult = oper.GetResult().ToString(); Console.WriteLine("结果是：" + strResult); Console.ReadLine(); } catch (Exception ex) { Console.WriteLine("您的输入有错：" + ex.Message); } } }}
业务逻辑层：
using System;using System.Collections.Generic;using System.Text;namespace OperationLibrary{ /// <summary> /// 运算类 （作为父类被用来继承 提供共用属性和方法） /// </summary> public 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> /// 检查输入的字符串是否准确 /// </summary> /// <param name="currentNumber"></param> /// <param name="inputString"></param> /// <returns></returns> public static string checkNumberInput(string currentNumber, string inputString) { string result = ""; if (inputString == ".") { if (currentNumber.IndexOf(".") < 0) { if (currentNumber.Length == 0) result = "0" + inputString; else result = currentNumber + inputString; } } else if (currentNumber == "0") { result = inputString; } else { result = currentNumber + inputString; } return result; } } /// <summary> /// 加法类 （子类继承父类） /// </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> /// 平方类 /// </summary>
class OperationSqr : Operation { public override double GetResult() { double result = 0; result = NumberB * NumberB; return result; } }
/// <summary> /// 平方根类 /// </summary>
class OperationSqrt : Operation { public override double GetResult() { double result = 0; if (NumberB < 0) throw new Exception("负数不能开平方根。"); result = Math.Sqrt(NumberB); return result; } }
/// <summary> /// 相反数类 /// </summary>
class OperationReverse : Operation { public override double GetResult() { double result = 0; result = -NumberB; return result; } }
/// <summary> /// 运算类工厂 (根据运算符的不同 去实例化不同的类型实例 实现多态) /// </summary>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; } case "sqr": { oper = new OperationSqr(); break; } case "sqrt": { oper = new OperationSqrt(); break; } case "+/-": { oper = new OperationReverse(); break; } } return oper; }}}
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