Patterns 101 – Factory Pattern

CreatorLEDTelevision.cs

class CreatorLEDTelevision : ITelevisionCreator
{
  public Television CreateTelevision()
  {
    return new LED();
  }
}
class CreatorLCDTelevision : ITelevisionCreator
{
  public Television CreateTelevision()
  {
    return new LCD();
  }
}
class CreatorPlasmaTelevision : ITelevisionCreator
{
  public Television CreateTelevision()
  {
    return new Plasma();
  }
}

ElementConvention.cs

namespace Caliburn.Micro
{
  using System;
  using System.Reflection;
  using System.Windows;
  
  /// <summary>
  /// Represents the conventions for a particular element type.
  /// </summary>
  public class ElementConvention
  {
    /// <summary>
    /// The type of element to which the conventions apply.
    /// </summary>
    public Type ElementType;
    
    /// <summary>
    /// Gets the default property to be used in binding conventions.
    /// </summary>
    public Func<DependencyObject, DependencyProperty> GetBindableProperty;
    
    /// <summary>
    /// The default trigger to be used when wiring actions on this element.
    /// </summary>
    public Func<System.Windows.Interactivity.TriggerBase> CreateTrigger;
    
    /// <summary>
    /// The default property to be used for parameters of this type in actions.
    /// </summary>
    public string ParameterProperty;
    
    /// <summary>
    /// Applies custom conventions for elements of this type.
    /// </summary>
    /// <remarks>Pass the view model type, property path, property instance, framework element and its convention.</remarks>
    public Func<Type, string, PropertyInfo, FrameworkElement, ElementConvention, bool> ApplyBinding =
      (viewModelType, path, property, element, convention) => ConventionManager.SetBinding(viewModelType, path, property, element, convention);
  }
}

ITelevisionCreator.cs

interface ITelevisionCreator
{
  Television CreateTelevision();
}

LCD.cs

class LCD : Television
{
}
class LED : Television
{
}
class Plasma : Television
{
}

Television.cs

abstract class Television
{
  private readonly string _typeName;
   
  protected Television()
  {
    _typeName = GetType().Name;
  }
   
  public void TurnOn()
  {
    Console.WriteLine("Type == {0}  Action == TurnOn()", _typeName);
  }
   
  public void TurnOff()
  {
    Console.WriteLine("Type == {0}  Action == TurnOff()", _typeName);
  }
   
  public void SetChannel(int channelNumber)
  {
    Console.WriteLine("Type == {0}  Action == SetChannel({1})", _typeName, channelNumber);
  }
}