Concrete Command (AddTextCommand):?

• The AddTextCommand is a concrete implementation of the ICommand

interface. It encapsulates the request to add text to the document.

• The Execute() method adds the specified text to the document, and the

Undo() method removes that text.

public class AddTextCommand : ICommand

private readonly Document _document;

private readonly string _text;

public AddTextCommand(Document document, string text)

_document = document;

_text = text;

public void Execute() => _document.AddText(_text);

public void Undo() => _document.RemoveText(_text);