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.
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.
