[WPF]ICommand最佳使用方法

 public class RelayCommand:ICommand
    {
        private Predicate<object> _canExecute;
        private Action<object> _execute;

        public RelayCommand(Predicate<object> canExecute, Action<object> execute)
        {
            this._canExecute = canExecute;
            this._execute = execute;
        }

        public event EventHandler CanExecuteChanged
        {
            add { CommandManager.RequerySuggested += value; }
            remove { CommandManager.RequerySuggested -= value; }
        }

        public bool CanExecute(object parameter)
        {
            return _canExecute(parameter);
        }

        public void Execute(object parameter)
        {
            _execute(parameter);
        }
    }

使用：

public class MyViewModel
{
    private ICommand _doSomething;
    public ICommand DoSomethingCommand
    {
        get
        {
            if (_doSomething == null)
            {
                _doSomething = new RelayCommand(
                    p => this.CanDoSomething,
                    p => this.DoSomeImportantMethod());
            }
            return _doSomething;
        }
    }
}

其中，Predicate<object>：