//When a student is added, edited or deleted
//remove/add them to appropriate StudentList
public void OnStudentAltered(object source, StudentEventArgs e)
{
try
{
dbUpdateOperation(e);
if (e.Operation == "delete")
{
if (hasStudentPassed(e.SelectedStudent))
{
passedStudents.Remove(e.SelectedStudent);
passedCounter--;
}
else
{
failedStudents.Remove(e.SelectedStudent);
}
totalCounter--;
}
else if (e.Operation == "edit")
{
if (e.SelectedStudent.gradeChanged)
{
if (hasStudentPassed(e.SelectedStudent))
{
failedStudents.Remove(e.SelectedStudent);
studentPassed(e.SelectedStudent);
}
else
{
passedStudents.Remove(e.SelectedStudent);
passedCounter--;
studentFailed(e.SelectedStudent);
}
}
}
else if (e.Operation == "add")
{
if (e.SelectedStudent.gradePassed(e.SelectedStudent.FinalGrade))
{
studentPassed(e.SelectedStudent);
}
else
{
studentFailed(e.SelectedStudent);
}
totalCounter++;
}
PercentPassedCalc(totalCounter, passedCounter);
backButton.Visibility = Visibility.Hidden;
Main.Content = dis1;
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
protected virtual void OnStudentAltered(string operation)
{
EventHandler <StudentEventArgs> localStudentAltered = StudentAltered;
if (localStudentAltered != null)
{
if (operation == "edit")
{
selectedStudent.FinalGradeCalc();
}
StudentEventArgs args = new StudentEventArgs()
{
SelectedStudent = selectedStudent, Operation = operation
};
StudentAltered(this, args);
}
}
//Depending on add, edit or delete, performs a different query
public void dbUpdateOperation(StudentEventArgs op)
{
switch (op.Operation)
{
case "add":
context.Students.Add(op.SelectedStudent);
break;
case "edit":
//Should just jump to savechanges
break;
case "delete":
context.Students.Remove(op.SelectedStudent);
break;
default:
throw new InvalidOperationException();
}
context.SaveChanges();
}
