01-Simple Factory

Description: Encapsulates a base class that inherits a base class and can be implemented by a factory class when a different object needs to be instantiated.     Example: I am using a calculator applet to achieve. Operation Base class

    /// <summary>    ///Operation class/// </summary>     Public classoperaction {Private Double_numbera =0; Private Double_numberb =0;  Public DoubleNumbera {Get{return_numbera;} Set{_numbera =value;} }         Public DoubleNumberb {Get{return_numberb;} Set{_numberb =value;} }         Public Virtual DoubleGetResult () {Doubleresult =0; returnresult; }    }

Op Subclass, I put it in the OperactionAll.cs.

    <summary>///+ </summary> class Operactionadd:operaction {//&LT;SUMMARY&G        T        Calculation method///</summary>///<returns></returns> public override double GetResult ()            {double result = 0;            result = Numbera + Numberb;        return result; }}///<summary>////</summary> class Operactionsub:operaction {public over            Ride Double GetResult () {double result = 0;            result = Numbera-numberb;        return result; }}///<summary>///</summary> class Operactionmul:operaction {public over            Ride Double GetResult () {double result = 0;            result = Numbera * NUMBERB;        return result; }}///<summary>//except for//</summary> class Operactiondiv:operaction {public oveRride Double GetResult () {double result = 0;            result = Numbera/numberb;        return result; }    }

Factory class

    <summary>/    //Factory class/    //</summary> public class Operactionfactory    {        //method to create an instance Public        static Operaction createoperaction (string operacte)        {            operaction oper = null;            Switch (OPERACTE)            {case                "+":                    oper = new Operactionadd ();                    break;                Case "-":                    oper = new Operactionsub ();                    break;                Case "*":                    oper = new Operactionmul ();                    break;                Case "/":                    oper = new Operactiondiv ();                    break;            }            return oper;        }    }

Client Calls

    <summary>    ///Client call//</summary> class program {        static void Main (string[] args )        {            operaction oper = null;            Oper = operactionfactory.createoperaction ("-"); Create entity Oper from the factory            . Numbera = ten;            Oper. Numberb = 3;            Double result = oper. GetResult ();//Operation Method            Console.WriteLine (result);            Console.ReadLine ();        }    }

Finished.

01-Simple Factory