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Façade (Facade) Design Pattern

Introduction:
Façade is one of the most used design patterns on software industry. Basically it is about providing a simple interface for large body of code, like class library and it will help you on :

  1. Make large body of code easier to be understand.
  2. Make client code more readable.
  3. Reduce dependency of client code on class library, thus you will be able to change the internal implementation of your component without affecting client code.
  4. Wrap a bad-designed APIs with a single well-designed ASPI

A Façade design pattern is used when you want to implement a new way to use component which is easier and more convenient. While Adapter design pattern is used when an interface must match a specific contract and it should support polymorphic behavior.
Example:

FacadeDesignPattern

 

class Program
{
static void Main(string[] args)
{
Facade fcadeInstance = new Facade();
Console.WriteLine(“Calling DoSometihng1() Method”);
fcadeInstance.DoSometihng1();
Console.WriteLine(“——————-“);
Console.WriteLine(“Calling DoSometihng2() Method”);
fcadeInstance.DoSometihng2();
Console.ReadKey();
}
class Facade
{
private System1 sys1 = new System1();
private System2 sys2 = new System2();
public void DoSometihng1()
{
Console.WriteLine(sys1.System1Mehtod1());
Console.WriteLine(sys2.System2Mehtod1());
}
public void DoSometihng2()
{
Console.WriteLine(sys1.System1Mehtod2());
Console.WriteLine(sys2.System2Mehtod2());
}
}
class System1
{
public string System1Mehtod1()
{
return “System   1  Mehtod   1 is called”;
}
public string System1Mehtod2()
{
return “System   1  Mehtod   2 is called”;
}
}
class System2
{
public string System2Mehtod1()
{
return “System   2  Mehtod   1 is called”;
}
public string System2Mehtod2()
{
return “System   2  Mehtod   2 is called”;
}
}

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