public static void RunExercise()
{
var history = new DocumentHistory();
var doc = new Document {
Content = "The Title", FontName = "Times New Roman", FontSize = 12
};
history.Push(doc.CreateState(doc));
doc = new Document {
Content = "The Body", FontName = "Times New Roman", FontSize = 11
};
history.Push(doc.CreateState(doc));
Console.WriteLine($"State After Save: {doc.ToString()}");
doc = new Document {
Content = "The Footer", FontName = "Times New Roman", FontSize = 14
};
doc.RestoreState(history.Pop());
Console.WriteLine($"State After Restore: {doc.ToString()}");
}
private static void Main()
{
var history = new DocumentHistory();
Document document = new Document("Content 1");
Console.WriteLine("Original document:");
Console.WriteLine(document.Content);
var currentState = document.GetState();
history.History.Push(currentState);
document.Content = "Content 2";
Console.WriteLine("Modified document:");
Console.WriteLine(document.Content);
var previousState = history.History.Pop();
document.Undo(previousState);
Console.WriteLine("Restored document:");
Console.WriteLine(document.Content);
}