Работа с текстовым файлом

using System.Text;
using z3._2;
 
Console.OutputEncoding = System.Text.Encoding.UTF8;
 
var file_patch = @"D:\Academy\2 курс\Предмети\Практика\z3.2\z3.2\TextFile1.txt";
 
StreamReader reader = null;
 
List<z3._2.Student> students = new List<z3._2.Student>();
 
try
{
    reader = new StreamReader(file_patch, Encoding.Unicode);
    string line;
    while ((line = reader.ReadLine()) != null)
    {
        
        string[] parts = line.Split(',');
        students.Add(new Student
        {
            LastName = parts[0],
            Year = int.Parse(parts[1]),
            poll = parts[2],
        });
    }
}
catch (Exception ex)
{
    Console.WriteLine(ex.Message);
}
finally
{
    if(reader != null)
        reader.Close();
}
Console.WriteLine("Complete!!!");
 
 
foreach (var p in students)
    Console.WriteLine($"{p.LastName} {p.Year - 2022}  {p.poll}");

namespace z3._2
{
    public class Student
    {
 
        public string LastName { get; set; }
        public int Year { get; set; }
        public string poll { get; set; }
 
        public override string ToString()
        {
            return $"{LastName}: {Year} and {poll}";
        }
        
    }
}

students.Average(i=>i.Year)

students.FindAll(i=>i.poll.IndexOf("м",StringComparison.InvariantCultureIgnoreCase)>=0)

var result = students.Where(i => i.poll == "м");
    foreach(Student st in result)
      Console.WriteLine(st.ToString());

Console.WriteLine($"Средний возраст  { students.Average(i =>DateTime.Now.Year- i.Year)}");

Console.WriteLine($"Студенты мужского пола");
foreach (var male in students.FindAll(i=>i.poll.IndexOf("м",StringComparison.InvariantCultureIgnoreCase)>=0))
{
Console.WriteLine(male.ToString());
}
 
 
 
 
Console.WriteLine($"Средний возраст  { students.Average(i =>DateTime.Now.Year- i.Year)}");

students.Average(i => i.Year);

    Console.WriteLine($"Средний возраст  { (double)students.Sum(i => DateTime.Now.Year- i.Year)/students.Count}");