public IActionResult ProcessForm(List <int> question, List <string> answer, string submit, string save, string restore)
{
SurveyState state = new SurveyState();
state.Questions = question;
state.Answers = answer;
Survey survey = new Survey(state);
if (submit != null)
{
Caretaker.Snapshot = null;
survey.Submit();
ViewBag.Message = "Survey data submitted!";
}
if (save != null)
{
Caretaker.Snapshot = survey.CreateSnapshot();
ViewBag.Message = "Snapshot created!";
}
if (restore != null)
{
survey.RestoreSnapshot(Caretaker.Snapshot);
ViewBag.Message = "Survey restored!";
}
ViewBag.Answers = survey.GetAnswers();
using (AppDbContext db = new AppDbContext())
{
List <Question> model = db.Questions.ToList();
return(View("Index", model));
}
}
static void Main(string[] args)
{
Console.WriteLine("Memento pattern demo...");
List <IMemento <SurveyState> > surveySnapshot = new List <IMemento <SurveyState> >(); //Caretaker
var survey = new Survey()
{
Name = "test"
};
survey.AddAnswer(1, "I like c#");
survey.AddAnswer(2, "Yes");
Console.WriteLine(survey);
Console.WriteLine("---");
surveySnapshot.Add(survey.CreateSnapshot());
survey.AddAnswer(3, "No");
Console.WriteLine(survey);
Console.WriteLine("---");
survey.RestoreSnapshot(surveySnapshot.Last());
Console.WriteLine(survey);
Console.WriteLine("---");
}