Façade Design Pattern

This article shows how to create a code using Façade Design Pattern in C#.

As discussed in dofactory.com Façade is a single class that represents an entire subsystem.     

The article that is easier to understand is http://www.dofactory.com/net/facade-design-pattern. My source code is based on this article.

Logical diagram of Façade Design Pattern.

clip_image001

First, create all the subsystem. In this example, we have 4 subsystems.

class SubSystemOne

{

  public void MethodOne()

  {

    Console.WriteLine(” SubSystemOne Method”);

  }

}

 

class SubSystemTwo

{

  public void MethodTwo()

  {

    Console.WriteLine(” SubSystemTwo Method”);

  }

}

 

class SubSystemThree

{

  public void MethodThree()

  {

    Console.WriteLine(” SubSystemThree Method”);

  }

}

 

{

  public void MethodFour()

  {

    Console.WriteLine(” SubSystemFour Method”);

  }

}

 Then, create a Façade class.

class Facade

{

  private SubSystemOne _one;

  private SubSystemTwo _two;

  private SubSystemThree _three;

  private 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();

  }

}

 

Finally, below is how the main method will look.

public static void Main()

{

  Facade facade = new Facade();

 

  facade.MethodA();

  facade.MethodB();

 

  // Wait for user

  Console.ReadKey();

} 

You can also download a single solution from http://skydrive.live.com. The sample file name is ConAppFacade.zip My MSN ID is chanmmn@hotmail.com.

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About chanmingman

Since March 2011 Microsoft Live Spaces migrated to Wordpress (http://www.pcworld.com/article/206455/Microsoft_Live_Spaces_Moves_to_WordPress_An_FAQ.html) till now, I have is over 1 million viewers. This blog is about more than 50% telling you how to resolve error messages, especial for Microsoft products. The blog also has a lot of guidance teaching you how to get stated certain Microsoft technologies. The blog also uses as a help to keep my memory. The blog is never meant to give people consulting services or silver bullet solutions. It is a contribution to the community. Thanks for your support over the years. Ming Man is Microsoft MVP since year 2006. He is a software development manager for a multinational company. With 25 years of experience in the IT field, he has developed system using Clipper, COBOL, VB5, VB6, VB.NET, Java and C #. He has been using Visual Studio (.NET) since the Beta back in year 2000. He and the team have developed many projects using .NET platform such as SCM, and HR based applications. He is familiar with the N-Tier design of business application and is also an expert with database experience in MS SQL, Oracle and AS 400.
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