private static void RemoveTrainer(string username)
{
Trainer trainer = Trainers.FirstOrDefault(x => x.UserName == username);
if (trainer == null)
{
throw new Exception("There is no such trainer");
}
Trainers.Remove(trainer);
}
private static Trainer SearchTrainers(string username)
{
return(Trainers.FirstOrDefault(x => x.UserName == username));
}
static void Main(string[] args)
{
PopulateDatabase();
while (true)
{
try
{
Console.WriteLine("Enter username");
string userName = Console.ReadLine();
if (string.IsNullOrEmpty(userName))
{
throw new Exception("You must enter username");
}
//first check admins
Admin admin = SearchAdmins(userName);
if (admin != null)
{
Console.WriteLine("" +
"1) Add teacher," +
"2) Remove teacher," +
"3) Add student," +
"4) Remove student," +
"5) Add admin," +
"6) Remove admin");
int option = int.Parse(Console.ReadLine());
switch (option)
{
case 1:
AddMember(Role.Trainer);
break;
case 2:
Console.WriteLine("Enter username");
string username = Console.ReadLine();
RemoveTrainer(username);
break;
case 3:
AddMember(Role.Student);
break;
case 4:
Console.WriteLine("Enter username");
string studentUsername = Console.ReadLine();
RemoveStudent(studentUsername);
break;
case 5:
AddMember(Role.Admin);
break;
case 6:
Console.WriteLine("Enter username");
string adminUsername = Console.ReadLine();
if (adminUsername == admin.UserName)
{
throw new Exception("You can not delete yourself");
}
RemoveAdmin(adminUsername);
break;
default:
throw new Exception("You must enter valid option 1-6");
}
}
else
{
//not an admin
Trainer trainer = Trainers.FirstOrDefault(x => x.UserName == userName);
if (trainer != null)
{
//trainer
Console.WriteLine("Enter option 1) See students 2) See subjects");
int trainerOption = int.Parse(Console.ReadLine());
switch (trainerOption)
{
case 1:
PrintStudents();
break;
case 2:
PrintSubjects();
break;
default:
throw new Exception("You must enter valid option 1/2");
}
}
else
{
//not an admin, not a trainer
Student student = Students.FirstOrDefault(x => x.UserName == userName);
if (student == null)
{
throw new Exception("The user does not exist");
}
student.PrintDetails();
}
}
}
catch (FormatException ex)
{
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("Input was not a number");
Console.WriteLine(ex.Message);
}
catch (Exception ex)
{
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("An error occured");
Console.WriteLine(ex.Message);
}
Console.ForegroundColor = ConsoleColor.White;
Console.WriteLine("Would you like to continue? Type yes");
string response = Console.ReadLine();
if (response.ToLower() == "yes")
{
continue;
}
else
{
break;
}
}
Console.ReadLine();
}