static bool TestDecoratorPattern()
{
Console.WriteLine("TESTING THE DECORATOR DESIGN PATTERN: ");
ConcreteComponent comp = new ConcreteComponent();
ConcreteDecoratorA d1 = new ConcreteDecoratorA(comp);
ConcreteDecoratorB d2 = new ConcreteDecoratorB(d1);
comp.Operation();
//Output:
//Operation from ConcreteComponent
d1.Operation();
//Output:
//Operation from ConcreteComponent
//(AddedBehaviour A) + Operation from ConcreteDecoratorA
d2.Operation();
//Output:
//Operation from ConcreteComponent
//(AddedBehaviour A) + Operation from ConcreteDecoratorA
//(AddedBehaviour B) + Operation from ConcreteDecoratorB
return(true);
}
public static void Test()
{
var concreteComponent = new ConcreteComponent("concrete property", "component property");
concreteComponent.Operation();
var concreteDecorator = new ConcreteDecorator(concreteComponent);
concreteDecorator.AnotherOperation();
}
static void Main(string[] args)
{
// Decorators
Component simple = new ConcreteComponent();
DecoratorAlpha decoratorAlpha = new DecoratorAlpha(simple);
DecoratorBeta decoratorBeta = new DecoratorBeta(decoratorAlpha);
Console.WriteLine(simple.Operation());
Console.WriteLine(decoratorAlpha.Operation());
Console.Write(decoratorBeta.Operation());
}
public static void TestDecorator()
{
IComponent component = new ConcreteComponent();
Console.WriteLine(component.Operation());
Decorator decorator = new ConcreteDecoratorA(component);
Console.WriteLine(decorator.Operation());
decorator = new ConcreteDecoratorB(decorator);
Console.WriteLine(decorator.Operation());
}
/// <summary>
/// Execute decorator design pattern example
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Decorator_OnClick(object sender, RoutedEventArgs e)
{
var simpleComponent = new ConcreteComponent();
DesignPatternsLog.Text += $"Decorator@ I get a simple component: {simpleComponent.Operation()}";
DesignPatternsLog.Text += $"{Environment.NewLine}";
// Note how decorators can wrap not only simple components
// but the other decorators as well.
var decoratorA = new ConcreteDecoratorA(simpleComponent);
var decoratorB = new ConcreteDecoratorB(decoratorA);
DesignPatternsLog.Text += $"Decorator@ Now I've got a decorated component: {decoratorB.Operation()}";
DesignPatternsLog.Text += $"{Environment.NewLine}";
}
public static void Main()
{
ConcreteComponent cc = new ConcreteComponent();
cc.Operation();
Console.WriteLine();
ConcreteDecoratorA cd1 = new ConcreteDecoratorA(cc);
cd1.Operation();
Console.WriteLine();
ConcreteDecoratorB cd2 = new ConcreteDecoratorB(cd1);
cd2.Operation();
Console.WriteLine();
Console.ReadKey();
}