(C #) Factory method mode

1. Factory Method Mode

The first is an interface for creating an object, letting the subclass decide which class to instantiate. The factory method defers the instantiation of a class to its subclasses.

* Factory method mode overcomes the disadvantage of the simple Factory mode violating the open-closed principle, and preserves the advantages of the encapsulation object creation process.

2. Example

namespaceFactory method Mode {classProgram {Static voidMain (string[] args) {Ifactory Factory=Newcundergraduate (); Leifeng Student=Factory.            Createleifeng (); Student.            Sweep (); Student.            Wash (); Student.            Buyrice ();        Console.ReadLine (); }    }    /// <summary>    ///classes of operations performed by public in all factories/// </summary>    classLeifeng { Public voidSweep () {Console.WriteLine ("sweeping"); }         Public voidWash () {Console.WriteLine ("Laundry"); }         Public voidBuyrice () {Console.WriteLine ("Buy Rice"); }    }    /// <summary>    ///Create a factory interface/// </summary>    Interfaceifactory {Leifeng Createleifeng (); }    /// <summary>    ///classes that the factory needs to instantiate/// </summary>    classUndergraduate:leifeng {}/// <summary>    ///classes that the factory needs to instantiate/// </summary>    classVoluteers:leifeng {}/// <summary>    ///factory, used to instantiate classes/// </summary>    classCundergraduate:ifactory { PublicLeifeng Createleifeng () {return NewUndergraduate (); }    }    /// <summary>    ///factory, used to instantiate classes/// </summary>    classCvoluteers:ifactory { PublicLeifeng Createleifeng () {return Newvoluteers (); }    }}

(C #) Factory method mode