public bool Contains(Lecturer item)
{
return(list.Contains(item));
}
public static People people = new People(); //Creating list object from People class which extends ICollection
static void Main(string[] args)
{
//declaring variables
int choice;
bool backToMenu = true;
try // Wrapping code in a try/catch block to handle exceptions.
{
//Creating student objects and adding them to the list.
Student student1 = new Student("1234567a", "Ryan Murphy", "45 Nothing Hill", "234-5678", "*****@*****.**", 22344, StudentStatus.undergraduate);
Student student2 = new Student("2345767b", "Julie Holmes", "76 Wilston Church", "234-6587", "*****@*****.**", 34566, StudentStatus.postgraduate);
Student student3 = new Student("3456789c", "Nicole Smith", "43 Holland Street", "234-8593", "*****@*****.**", 45988, StudentStatus.undergraduate);
people.Add(student1);
people.Add(student2);
people.Add(student3);
//Creating arrays which will store the subjects taught by each lecturer. Creating Lecturer objects.
string[] array1 = { "programming", "web design" };
Lecturer lecturer1 = new Lecturer("2345678b", "Seamus Finn", "67 Wolfe Tone St", "234-6789", "*****@*****.**", 22448, 45000, array1);
string[] array2 = { "information management", "database development" };
Lecturer lecturer2 = new Lecturer("4567882c", "Brian Halford", "35 Castleview", "234-9845", "*****@*****.**", 23644, 48000, array2);
string[] array3 = { "Operating Systems", "Networking", "Cloud Computing" };
Lecturer lecturer3 = new Lecturer("5678901d", "Ailish Hilton", "41 Campus Road", "234-8765", "*****@*****.**", 22455, 43000, array3);
//Adding lecturer objects to the list
people.Add(lecturer1);
people.Add(lecturer2);
people.Add(lecturer3);
Console.WriteLine("Welcome to DBS database system!");
do
{
//menu to be displayed to the user
Console.WriteLine("---------------------------------------");
Console.WriteLine("Press:");
Console.WriteLine("1. To add a student");
Console.WriteLine("2. To add a lecturer");
Console.WriteLine("3. To search for a student by name ");
Console.WriteLine("4. To search for a lecturer by name ");
Console.WriteLine("5. To search for a student by Id ");
Console.WriteLine("6. To search for a lecturer by Id");
Console.WriteLine("7. Show details for all students");
Console.WriteLine("8. Show names of all lecturers");
Console.WriteLine("9. To Quit");
Console.WriteLine("--------------------------------------");
int.TryParse(Console.ReadLine(), out choice);
switch (choice) // Switch statement for options
{
case 1:
AddStudent(); // Calling addStudent method which adds the student to the person list.
break;
case 2:
AddLecturer(); // Calling addLecturer method which adds the lecturer to the person list.
break;
case 3:
Console.WriteLine("Please enter student name: ");
string StudentName = Console.ReadLine();
if (people.Contains(StudentName)) //Calling the contains method to check if name property is in the list.
{
if (people.Where(i => i.Name == StudentName).FirstOrDefault() is Student) //lambda expression to determine if name found belongs to a student
{
Console.WriteLine("Student found\n"); //Output if list contains name and it belongs to a student.
Console.WriteLine(people.Where(i => i.Name == StudentName).FirstOrDefault());
}
else
{
Console.WriteLine("{0} is not a student", StudentName); //Output if the list contains the name property but it doesnt belong to a student.
}
}
else
{
Console.WriteLine("Student not found"); //Output if the list does not contain the name input by the user.
}
break;
case 4:
Console.WriteLine("Please enter lecturer name: "); //Here same process is repeated now for lecturer.
string LecturerName = Console.ReadLine();
if (people.Contains(LecturerName))
{ //Checking if the list contains name property.
if (people.Where(i => i.Name == LecturerName).FirstOrDefault() is Lecturer) //Checking if name property belongs to a lecturer.
{
Console.WriteLine("Lecturer found\n"); //Ouput if list contains name and it belongs to a lecturer.
Console.WriteLine(people.Where(i => i.Name == LecturerName).FirstOrDefault());
}
else
{
Console.WriteLine("{0} is not a lecturer", LecturerName); //Output if name property is in the list but does not belong to a lecturer.
}
}
else
{
Console.WriteLine("Lecturer not found"); //Output if the list does not contain the name input by user.
}
break;
case 5:
Console.WriteLine("Please enter student number: ");
int studentNumber = int.Parse(Console.ReadLine());
bool studentFound = false;
foreach (Person p in people)
{
if (p is Student) //Iterating through the list and checking for students.
{
var a = ((Student)p).StudentId; //Each time a student is found in the list we check its id against the student number input by the user.
if (a == studentNumber)
{
studentFound = true;
Console.WriteLine("Student found"); //Output if input is an id that belongs to a student. We call Show info method to display student name.
Console.WriteLine(p.ShowInfo()); //We call Show info method to display student name.
break;
}
}
}
if (!studentFound)
{
Console.WriteLine("Student not found"); //Output if id is not found or it does not belong to a student.
}
break;
case 6:
Console.WriteLine("Please enter lecturer Id: ");
int lecturerid = int.Parse(Console.ReadLine());
bool lecturerFound = false;
foreach (Person p in people)
{
if (p is Lecturer) //Iterating through the list and checking for lecturers.
{
var a = ((Lecturer)p).StaffId; //Each time a lecturer is found in the list we check its id against the lecturer id input by the user.
if (a == lecturerid)
{
lecturerFound = true;
Console.WriteLine("Lecturer found"); //Output if input is an id that belongs to a lecturer. We call Show info method to display lecturer name.
Console.WriteLine(p.ShowInfo()); //We call Show info method to display lecturer name.
break;
}
}
}
if (!lecturerFound)
{
Console.WriteLine("Lecturer not found"); //Output if id is not found or it does not belong to a lecturer.
}
break;
case 7:
ShowStudentDetails(); //Calling method to display all students details.
break;
case 8:
ShowLecturerNames(); //Calling method to display all lecturers names.
break;
case 9:
backToMenu = false; //Quit option
break;
default:
Console.WriteLine("Invalid option selected"); //In case number input by the user is invalid according to the menu.
break;
}
} while (backToMenu);
}
//Catch blocks to handle possible exceptions.
catch (ArgumentNullException ex)
{
Console.WriteLine(ex.Message);
Console.Read();
}
catch (ArgumentException ex)
{
Console.WriteLine(ex.Message);
Console.Read();
}
catch (FormatException ex)
{
Console.WriteLine(ex.Message);
}
catch (SystemException ex)
{
Console.WriteLine(ex.Message);
}
}
