/* Author: Jiangong SUN */ Facade Pattern (外觀模式) 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 SubSytemTwo { 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 SubSytemOne _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("MethodB():"); _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. Enjoy coding!
