ICommand のミニマムベースクラス

RelayCommand.cs

using System;
using System.Diagnostics;
using System.Windows.Input;

namespace SimpleMVVM
{
	public class RelayCommand : ICommand
	{
		private readonly Action<object> execute;
		private readonly Predicate<object> canExecute;
		public RelayCommand( Action<object> execute_ )
			: this( execute_, null )
		{
		}
		public RelayCommand( Action<object> execute_, Predicate<object> canExecute_ )
		{
			execute = execute_;
			canExecute = canExecute_;
		}
		public event EventHandler CanExecuteChanged
		{
			add { CommandManager.RequerySuggested += value; }
			remove { CommandManager.RequerySuggested -= value; }
		}
		[DebuggerStepThrough]
		public bool CanExecute( object parameter )
		{
			return canExecute == null ? true : canExecute( parameter );
		}
		public void Execute( object parameter )
		{
			execute( parameter );
		}
	}
}