Retrieving student course information from a collection

Courses
1

I’m working on a project for managing student enrollments. I’ve set up a collection of courses that students are taking but I’m struggling to get the data out in the main program. I tried to use the student ID to fetch the info but it’s not working as expected. I’m pretty new to programming so any help would be great.

Here’s a simplified version of what I’m trying to do:

class SchoolSystem
{
    Dictionary<int, Pupil> enrolledPupils = new Dictionary<int, Pupil>();
    List<Subject> availableSubjects = new List<Subject>();

    public void EnrollStudent()
    {
        var newStudent = new Pupil { Name = "Alex", ID = 12345 };
        newStudent.Classes = new List<Subject> { 
            new Subject { Code = 101, Name = "Math" },
            new Subject { Code = 102, Name = "Science" }
        };
        enrolledPupils.Add(newStudent.ID, newStudent);
    }

    // How do I access the subjects for a specific student in the main program?
}

Can someone explain how to properly retrieve and use the student course data?

2

To retrieve and use student course data in your main program, you can access it directly through the enrolledPupils dictionary. Here’s how you could do it:

public List<Subject> GetStudentCourses(int studentId)
{
    if (enrolledPupils.ContainsKey(studentId))
    {
        return enrolledPupils[studentId].Classes;
    }
    return new List<Subject>();
}

Then in your main program:

var schoolSystem = new SchoolSystem();
schoolSystem.EnrollStudent();

var studentCourses = schoolSystem.GetStudentCourses(12345);
foreach (var course in studentCourses)
{
    Console.WriteLine($"{course.Name} - Code: {course.Code}");
}

This approach encapsulates the data access within the SchoolSystem class, maintaining better control over your data structures. It also handles cases where a student ID might not exist in the dictionary.

3

Hey there ExploringForest! :wave:

I totally get where you’re coming from with this student enrollment project. It can be a bit tricky at first, but I think I might have a suggestion that could help you out.

Have you considered adding a method to your SchoolSystem class that retrieves the subjects for a specific student? Something like this might work:

public List<Subject> GetStudentSubjects(int studentId)
{
    if (enrolledPupils.TryGetValue(studentId, out Pupil student))
    {
        return student.Classes;
    }
    return null; // Or maybe return an empty list instead?
}

Then in your main program, you could use it like:

var schoolSystem = new SchoolSystem();
schoolSystem.EnrollStudent();

var alexSubjects = schoolSystem.GetStudentSubjects(12345);

What do you think about this approach? Does it fit with what you’re trying to do?

Also, I’m curious - what made you choose a Dictionary for storing enrolled pupils? It seems like a smart choice for quick lookups. Are you planning to add more functionality to your SchoolSystem class?

4

yo ExploringForest, i think i got a solution for ya. in ur main program, u can do smthn like this:

var student = enrolledPupils[studentId];
var courses = student.Classes;

this’ll grab the student from the dictionary and then get their classes. ez pz! lmk if u need more help