Monday, August 19, 2013

an event inherited from interface->abstract class->concrete class

In this class hierarchy, the event is declared in interface ICommand, then declared abstract in the abstract class, finally implemented in the concrete classes.

Note the abstract must declare it.

    abstract public class TanBinRelayCommand: ICommand{
        private Action methodToExecute;
        private Func<bool> isEnabled;

        public TanBinRelayCommand(Action methodToExecute, Func<bool> isEnabled)
        {
            this.methodToExecute = methodToExecute;
            this.isEnabled = isEnabled;
        }
        #region ICommand members
        /// <summary>
        /// who subscribes to this event? I think the command binding (or other objects in the xaml)
        /// </summary>
        bool ICommand.CanExecute(object obj) {
            if (this.isEnabled == null) return true;
           
            return this.isEnabled.Invoke();
        }
        void ICommand.Execute(object obj)
        {
            if (this.methodToExecute != null)
                this.methodToExecute.Invoke();
        }
        abstract public event EventHandler CanExecuteChanged;
       

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About Me

New York (Time Square), NY, United States
http://www.linkedin.com/in/tanbin