Is it possible to make indexers dynamic length?

Question

OOP

using System;                                                                  // 1
using System.Collections.Generic;                                  // 2

namespace test_for_fun
{                                                                                      
    class Program                                                                          
    {                                                                                   
        static void Main()
        {
            People people = new People();
            people[0] = new Person { Name = "Tom" };
            people[1] = new Person { Name = "Bob" };
            people[2] = new Person { Name = "Jon" };
        }
    }

    class Person
    {
        public string Name { get; set; }
    }
    class People
    {
        Person[] data;
        public People()
        {
            data = new Person[2];
        }
       
        public Person this[int index]
        {
            get
            {
                return data[index];
            }
            set
            {
                if (data.Length < index)                 // 37
                {
                    //увеличить длину data
                }
                data[index] = value;                               
            }                                                       // 42
        }
    }

}

The program has two classes. One template for the second, and the second indexer that stores references to an array of objects. I want to make the array dynamic, but as soon as I write this line (people[2] = new Person { Name = "Jon" };), then in debugging the process immediately jumps to line 42, skipping line 37. Is it possible to make the indexer dynamic?

Answer 1

class People{
List<Person> data = new List<Person>();
...

+ error handling

Answer 2

but as soon as I write this line (people[2] = new Person { Name = "Jon" };), then in debugging the process immediately jumps to line 42, skipping 37.

Well, that's right, he himself wrote such a condition.
Длинна(2) < Индекса(2)- no, it is not at all less, we do not go into the conditions. Why I couldn't figure it out in debugging I don't understand.

Answer 3

public Person this[int index]
        {
            get { return data[index]; }
            set
            {
                if(data.Length <= index) // 37
                {
                    Array.Resize(ref data, index + 1);
                }

                data[index] = value;
            } // 42
        }

Answer 4

It feels like you need Dictionary<int, Person>, instead of an array, then you won't need to dynamically expand the array when you need it (and it won't create extra empty space if you want to skip a couple of hundred elements)