//method: AddOrModifyQuestion
//description: modifies questions in the database
//params: Question question - new question with answers to add to database
// Question oldQuestion - old question containing answers to replace in database
//returns: void
public void AddOrModifyQuestion(Question question, Question oldQuestion)
{
if(stopped) return;
Task.Factory.StartNew(() => {
try {
lock (socketLock) {
//tell service to add or modify a question
writer.WriteLine("ADD_QUESTION");
writer.WriteLine("" + question.questionNumber);
writer.WriteLine("" + question.questionText);
for (int i = 0; i<oldQuestion.answers.Count(); i++) {
writer.WriteLine("OLDANSWER:" + oldQuestion.answers[i].answerText);
}
for (int i = 0; i<question.answers.Count(); i++){
writer.WriteLine("ANSWER:" + question.answers[i].answerText);
writer.WriteLine("ISCORRECT:" + question.answers[i].isCorrect);
}
writer.Flush();
//todo: delete any questions in the db whos QuestionNumber is the same as question.questionNumber
//todo: add new question to the db with the data from question
}
} catch(Exception) {
stopped = true;
socket.Close();
owner.Invoke((MethodInvoker)(() => { ConnectionLost(this, new EventArgs()); }));
}
});
}
//method: SaveButton_Click
//description: SaveButton click event
//params: object sender - sender
// EventArgs e - event args
//returns: void
private void SaveButton_Click(object sender, EventArgs e)
{
SaveButton.Enabled = false;
EditButton.Enabled = true;
if (questionNum != 10) {
NextButton.Enabled = true;
}
if (questionNum != 1) {
PreviousButton.Enabled = true;
}
QuestionTextbox.Enabled = false;
TextboxA.Enabled = false;
TextboxB.Enabled = false;
TextboxC.Enabled = false;
TextboxD.Enabled = false;
AnswerGroupbox.Enabled = false;
//Get A
answerA = new Answer();
answerA.answerText = TextboxA.Text;
answerA.isCorrect = RadioButtonA.Checked;
//Get B
answerB = new Answer();
answerB.answerText = TextboxB.Text;
answerB.isCorrect = RadioButtonB.Checked;
//Get C
answerC = new Answer();
answerC.answerText = TextboxC.Text;
answerC.isCorrect = RadioButtonC.Checked;
//Get D
answerD = new Answer();
answerD.answerText = TextboxD.Text;
answerD.isCorrect = RadioButtonD.Checked;
//create question
question = new Question();
question.answers = new List<Answer>();
question.questionNumber = questionNum;
question.questionText = QuestionTextbox.Text;
question.answers.Add(answerA);
question.answers.Add(answerB);
question.answers.Add(answerC);
question.answers.Add(answerD);
oldQuestion = new Question();
oldQuestion.answers = new List<Answer>();
oldQuestion.answers.Add(oldAnswerA);
oldQuestion.answers.Add(oldAnswerB);
oldQuestion.answers.Add(oldAnswerC);
oldQuestion.answers.Add(oldAnswerD);
connection.AddOrModifyQuestion(question, oldQuestion);
}
//method: GetQuestion
//description: retrieves question information from the database
//params: int questionNumber - questionNumber
//returns: void
public void GetQuestion(int questionNumber)
{
if(stopped) return;
Task.Factory.StartNew(() => {
try {
lock (socketLock) {
//tell service to get questions
writer.WriteLine("GET_QUESTION");
writer.WriteLine("" + questionNumber);
writer.Flush();
Question question = new Question();
question.questionNumber = questionNumber;
//get question
string input = reader.ReadLine();
if (input.StartsWith("QUESTION:")) {
question.questionText = input.Substring("QUESTION:".Length);
//get question answers
question.answers = new List<Answer>();
while (reader.PeekLine().StartsWith("ANSWER:")) {
Answer a = new Answer();
a.answerText = reader.ReadLine().Substring("ANSWER:".Length);
if (reader.PeekLine().StartsWith("ISCORRECT:")){
a.isCorrect = Convert.ToBoolean(reader.ReadLine().Substring("ISCORRECT:".Length));
question.answers.Add(a);
}
}
string writerDump = reader.ReadLine(); //dump for "DONE" string from server
owner.Invoke((MethodInvoker)(
() => { QuestionReceived(this, question); }
));
}
}
} catch(Exception) {
stopped = true;
socket.Close();
owner.Invoke((MethodInvoker)(() => { ConnectionLost(this, new EventArgs()); }));
}
});
}
//method: QuestionReceivedHandler
//description: question received event handler
//params: object sender - sender
// question q - question
//returns: void
private void QuestionReceivedHandler(object sender, Question q)
{
//put question and answers in textboxes
QuestionTextbox.Text = q.questionText;
TextboxA.Text = q.answers[0].answerText;
TextboxB.Text = q.answers[1].answerText;
TextboxC.Text = q.answers[2].answerText;
TextboxD.Text = q.answers[3].answerText;
//set correct answer
if (q.answers[0].isCorrect == true) {
RadioButtonA.Checked = true; ;
}
else if (q.answers[1].isCorrect == true) {
RadioButtonB.Checked = true;
}
else if (q.answers[2].isCorrect == true) {
RadioButtonC.Checked = true;
}
else if (q.answers[3].isCorrect == true) {
RadioButtonD.Checked = true;
}
}