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using System;// 可维护，可复用，可扩展，灵活性好namespace 简单工厂模式{	// 运算类	public class Operation	{		private double numberA = 0;		public double NumberA {			get {				return numberA;			}			set {				numberA = value;			}		}		private double numberB = 0;		public double NumberB {			get {				return numberB;			}			set {				numberB = value;			}		}		public virtual double GetResult()		{			double testResult = 0;			return testResult;		}	}	// 加法	class OperationAdd:Operation	{		public override double GetResult ()		{			double addResult = 0;			addResult = NumberA + NumberB;			return addResult;		}	}	// 减法	class OperationSub :Operation	{	public override double GetResult ()		{			double subResult = 0;			subResult = NumberA - NumberB;			return subResult;		}	}	// 乘法	class OperationMul :Operation	{	public override double GetResult ()		{			double mulResult = 0;			mulResult = NumberA * NumberB;			return mulResult;		}	}	// 除法	class OperationDiv :Operation	{	public override double GetResult ()		{			double divResult = 0;			divResult = NumberA / NumberB;			return divResult;		}	}	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;			}			return oper;		}	}	class MainClass	{		public static void Main (string[] args)		{						Operation oper;			oper = OperationFactory.createOperate("/");			oper.NumberA = 12;			oper.NumberB = 2;			Console.WriteLine (oper.GetResult());		}	}}

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