Facade in C#
Why read if you can watch?
Watch Facade's video tutorialProvides a unified interface to a set of interfaces in a subsystem. Façade defines a higher-level interface that makes the subsystem easier to use.
This structural code demonstrates the Facade pattern which provides a simplified and uniform interface to a large subsystem of classes.
using System;
class MainApp
{
public static void Main()
{
Facade facade = new Facade();
facade.MethodA();
facade.MethodB();
// Wait for user
Console.Read();
}
}
// "Subsystem ClassA"
class SubSystemOne
{
public void MethodOne()
{
Console.WriteLine(" SubSystemOne Method");
}
}
// Subsystem ClassB"
class SubSystemTwo
{
public void MethodTwo()
{
Console.WriteLine(" SubSystemTwo Method");
}
}
// Subsystem ClassC"
class SubSystemThree
{
public void MethodThree()
{
Console.WriteLine(" SubSystemThree Method");
}
}
// Subsystem ClassD"
class SubSystemFour
{
public void MethodFour()
{
Console.WriteLine(" SubSystemFour Method");
}
}
// "Facade"
class Facade
{
SubSystemOne one;
SubSystemTwo two;
SubSystemThree three;
SubSystemFour four;
public Facade()
{
one = new SubSystemOne();
two = new SubSystemTwo();
three = new SubSystemThree();
four = new SubSystemFour();
}
public void MethodA()
{
Console.WriteLine("\nMethodA() ---- ");
one.MethodOne();
two.MethodTwo();
four.MethodFour();
}
public void MethodB()
{
Console.WriteLine("\nMethodB() ---- ");
two.MethodTwo();
three.MethodThree();
}
}
MethodA() ----
SubSystemOne Method
SubSystemTwo Method
SubSystemFour Method
MethodB() ----
SubSystemTwo Method
SubSystemThree Method
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