Structural Patterns - Bridge C# sample

Bridge.cs

// Bridge pattern -- Structural example  
using System;

// "Abstraction"
class Abstraction
{
  // Fields
  protected Implementor implementor;

  // Properties
  public Implementor Implementor
  {
    set{ implementor = value; }
  }

  // Methods
  virtual public void Operation()
  {
    implementor.Operation();
  }
}

// "Implementor"
abstract class Implementor
{
  // Methods
  abstract public void Operation();
}

// "RefinedAbstraction"
class RefinedAbstraction : Abstraction
{
  // Methods
  override public void Operation()
  {
    implementor.Operation();
  }
}

// "ConcreteImplementorA"
class ConcreteImplementorA : Implementor
{
  // Methods
  override public void Operation()
  {
    Console.WriteLine("ConcreteImplementorA Operation");
  }
}

// "ConcreteImplementorB"
class ConcreteImplementorB : Implementor
{
  // Methods
  override public void Operation()
  {
    Console.WriteLine("ConcreteImplementorB Operation");
  }
}

/// <summary>
/// Client test
/// </summary>
public class Client
{
    public static void Main(string[] args)
    {
        Abstraction abstraction = new RefinedAbstraction();

        // Set implementation and call
        abstraction.Implementor = new ConcreteImplementorA();
        abstraction.Operation();

        // Change implemention and call
        abstraction.Implementor = new ConcreteImplementorB();
        abstraction.Operation();
    }
}