2. félév 3. óra (otthon) IComperble

namespace ComparableExample
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Student[] students =
            {
                new Student() { NeptunCode = "asd123", Semester = 3 },
                new Student() { NeptunCode = "fbg456", Semester = 1 },
                new Student() { NeptunCode = "wrez41", Semester = 2 },
                new Student() { NeptunCode = "fdgh10", Semester = 5 },
                new Student() { NeptunCode = "egh333", Semester = 2 },
                new Student() { NeptunCode = "qed786", Semester = 4 },
            };

            Array.Sort(students);

            foreach (Student student in students)
            {
                Console.WriteLine(student);
            }
        }
    }
}

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Osztály
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ComparableExample
{
    internal class Student : IComparable
    {
        public int Semester { get; set; }
        public string NeptunCode{ get; set; }

        public int CompareTo(object obj)
        {
            Student other = obj as Student;

            if (Semester == other.Semester)
            {
                return NeptunCode.CompareTo(other.NeptunCode);
            }
            if (Semester < other.Semester) return -1;
            return 0;
        }

        public override string ToString()
        {
            return $"{NeptunCode} ({Semester})";
        }
    }
}