WPF Relay command

RelayCommand.cs

public class RelayCommand<T> : ICommand
{
    private readonly Predicate<T> canExecute;
    private readonly Action<T> execute;

    public RelayCommand(Action<T> action)
        : this(x => true, action)
    {
        execute = action;
    }

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

    public event EventHandler CanExecuteChanged;

    public bool CanExecute(object parameter)
    {
        return canExecute((T)parameter);
    }

    public void UpdateCanExecuteState()
    {
        if (CanExecuteChanged != null)
        {
            CanExecuteChanged(this, new EventArgs());
        }
    }

    public void Execute(object parameter)
    {
        execute((T)parameter);

        UpdateCanExecuteState();
    }
}