Design patterns V: Facade Pattern

/* Author: Jiangong SUN */Facade Pattern (appearance mode) provides a unique interface to a set of methods of different subsystems in an application. it's widely used in application development. it's a structural pattern. now let's see the implementation in CSharp. firstly, create subsystems and their methods. class SubSytemOne {public void MethodOne () {Console. writeLine ("SubSystemOne Method");} class SubSy TemTwo {public void MethodTwo () {Console. writeLine ("SubSystemTwo Method") ;}} class SubSytemThree {public void MethodThree () {Console. writeLine ("SubSystemThree Method");} class SubSytemFour {public void MethodFour () {Console. writeLine ("SubSystemThree Method");} Create Facade class and its methods as an interface to subsystems 'methods' aggregation. class Facade {private readonly SubS YtemOne _ one; private readonly SubSytemTwo _ two; private readonly SubSytemThree _ three; private readonly SubSytemFour _ four; public Facade () {_ one = new SubSytemOne (); _ two = new SubSytemTwo (); _ three = new SubSytemThree (); _ four = new SubSytemFour ();} public void MethodA () {Console. writeLine ("MethodA ():"); _ one. methodOne (); _ three. methodThree ();} public void MethodB () {Console. writeLine ("Met HodB (): "); _ two. methodTwo (); _ four. methodFour ();} public void MethodC () {Console. writeLine ("MethodC ():"); _ one. methodOne (); _ two. methodTwo (); _ four. methodFour () ;}} The clients can call facade's methods to satisfy its requirements. var facade = new Facade (); facade. methodA (); facade. methodB (); facade. methodC (); So this is the implementation of facade pattern. I hope you enjoy this article. enjo Y coding!