public static Poll GetPollsInfo(int pollID)
{
using (PollSystemEntities context = new PollSystemEntities())
{
Poll poll = context.Polls.Include("PollAnswers").First(p => p.PollID == pollID);
return poll;
}
}
public static List<Poll> GetAllPolls()
{
using (PollSystemEntities context = new PollSystemEntities())
{
List<Poll> polls = context.Polls.Include("PollAnswers").OrderBy(p => p.Question).ToList();
return polls;
}
}
public static List<Poll> GetThreeRandomPolls()
{
using(PollSystemEntities context = new PollSystemEntities())
{
List<Poll> polls = context.Polls.Include("PollAnswers").ToList();
List<Poll> pollsToReturn = new List<Poll>();
Random rndGen = new Random();
for (int i = 0; i < 3 && polls.Count != 0; i++)
{
int index = rndGen.Next(0, polls.Count);
pollsToReturn.Add(polls[index]);
polls.RemoveAt(index);
}
return pollsToReturn;
}
}
public static void CreateNewPoll(string question, string answer1,
string answer2, string answer3, string answer4, string answer5, string answer6)
{
Poll newPoll = new Poll();
newPoll.Question = question;
PollSystemEntities context = new PollSystemEntities();
context.Polls.AddObject(newPoll);
context.SaveChanges();
if (!string.IsNullOrWhiteSpace(answer1))
CreateAnswer(answer1, newPoll);
if (!string.IsNullOrWhiteSpace(answer2))
CreateAnswer(answer2, newPoll);
if (!string.IsNullOrWhiteSpace(answer3))
CreateAnswer(answer3, newPoll);
if (!string.IsNullOrWhiteSpace(answer4))
CreateAnswer(answer4, newPoll);
if (!string.IsNullOrWhiteSpace(answer5))
CreateAnswer(answer5, newPoll);
if (!string.IsNullOrWhiteSpace(answer6))
CreateAnswer(answer6, newPoll);
}
public static int ShowVotesCount(int pollID)
{
using (PollSystemEntities context = new PollSystemEntities())
{
Poll poll = context.Polls.Include("PollAnswers").First(p => p.PollID == pollID);
int votesCount = 0;
foreach (PollAnswer answer in poll.PollAnswers)
{
votesCount += answer.Votes;
}
return votesCount;
}
}
public static void ResetPoll(int pollID)
{
PollSystemEntities context = new PollSystemEntities();
context.ExecuteStoreCommand("UPDATE PollAnswers SET Votes=0 WHERE PollID={0}", pollID);
}
public static void DeletePoll(int pollID)
{
PollSystemEntities context = new PollSystemEntities();
context.ExecuteStoreCommand("DELETE FROM PollAnswers WHERE PollID={0}", pollID);
context.ExecuteStoreCommand("DELETE FROM Polls WHERE PollID={0}", pollID);
}
private static void CreateAnswer(string answerText, Poll newPoll)
{
using (PollSystemEntities context = new PollSystemEntities())
{
if (answerText.Length > 255)
{
// Special case: long text should be inserted directly
string cmd = String.Format("INSERT INTO PollAnswers(Answer, Votes, PollID) VALUES ('{0}', {1}, {2})", answerText, 0, newPoll.PollID);
context.ExecuteStoreCommand(cmd);
}
else
{
PollAnswer answer = new PollAnswer();
answer.Answer = answerText;
answer.PollID = newPoll.PollID;
answer.Votes = 0;
context.PollAnswers.AddObject(answer);
}
context.SaveChanges();
}
}
public static void VoteForPoll(int answerID)
{
using (PollSystemEntities context = new PollSystemEntities())
{
PollAnswer answer = context.PollAnswers.First(a => a.AnswerID == answerID);
int votes = answer.Votes;
answer.Votes = votes + 1;
context.SaveChanges();
}
}
