public SaveNoteCommand([NotNull] INotebook notebook, [NotNull] IUserFileInput userFileInput,
[NotNull] IFileSaver fileSaver)
{
ThrowIf.Variable.IsNull(notebook, nameof(notebook));
ThrowIf.Variable.IsNull(userFileInput, nameof(userFileInput));
ThrowIf.Variable.IsNull(fileSaver, nameof(fileSaver));
_notebook = notebook;
_userFileInput = userFileInput;
_fileSaver = fileSaver;
}