Passive MVP Implementation

    /// <summary>
    /// Defines a presenter.
    /// </summary>
    /// <typeparam name="TView">The type of the view the presenter uses.</typeparam>
    public interface IPresenter<TView>
        where TView : IView
    {
        /// <summary>
        /// Gets the view.
        /// </summary>
        TView View { get; }
    }



    /// <summary>
    /// Base implementation of a presenter.
    /// </summary>
    /// <typeparam name="TView">The type of view the presenter uses.</typeparam>
    public class Presenter<TView> : IPresenter<TView>
        where TView : IView
    {
        /// <summary>
        /// Gets the view.
        /// </summary>
        public TView View { get { return _view; } }
        private readonly TView _view;

        /// <summary>
        /// Creates a new <see cref="Presenter"/>.
        /// </summary>
        /// <param name="view">The view attached to the presenter.</param>
        public Presenter(TView view)
        {
            ThrowIf.Null(() => view);

            _view = view;
        }
    }



    /// <summary>
    /// Defines a view.
    /// </summary>
    public interface IView
    {
    }



    /// <summary>
    /// Event args that requires to invoke and action.
    /// </summary>
    public class ActionEventArgs : EventArgs
    {
        /// <summary>
        /// Defines an empty value.
        /// </summary>
        public static new ActionEventArgs Empty = new ActionEventArgs(null);

        /// <summary>
        /// Gets the action.
        /// </summary>
        /// <value>The action.</value>
        public Action Action { get { return _action; } }
        private readonly Action _action;

        /// <summary>
        /// Gets a value indicating whether this instance has an action.
        /// </summary>
        /// <value><c>true</c> if this instance has an action; otherwise, <c>false</c>.</value>
        public bool HasAction {get{ return _action != null; }}

        public ActionEventArgs (Action action)
            : base()
        {
            _action = action;
        }
    }