WPF Customize DelegateCommand

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

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

public DelCmd(Action<object> execute):this(execute,null)
{

}

public DelCmd(Action<object> execute,Predicate<object> canExecute)
{
_execute = execute;
_canExecute = canExecute;
}
public bool CanExecute(object parameter)
{
if(_canExecute==null)
{
return true;
}
return _canExecute(parameter);
}

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

}