错误C＃：索引超出范围。 必须为非负数且小于集合的大小

Question

I've got a problem with creating objects in a for loop and adding them in a list. The program starts with "How much you want to add?" and whatever I write it shows me a message : Index was out of range. Must be non-negative and less than the size of the collection. What goes wrong? Sorry if there is another similar question but I couldn't find an answer. Thank you!

  using System;
using System.Collections.Generic;


class Animals
{

    public int id { get; set; }


    public string name { get; set; }


    public string color { get; set; }     


    public int age { get; set; }

    }

class Program
{
    static void Main(string[] args)
    {
        Console.Write("How much animals you want to add?: ");
        int count = int.Parse(Console.ReadLine());

        var newAnimals = new List<Animals>(count);

        for (int i = 0; i < count; i++)
        {
            newAnimals[i].id = i;

            Console.Write("Write name for animal " + i);
            newAnimals[i].name = Console.ReadLine();

            Console.Write("Write age for animal " + i);
            newAnimals[i].age = int.Parse(Console.ReadLine());

            Console.Write("Write color for animal " + i );
            newAnimals[i].color = Console.ReadLine();

        }

        Console.WriteLine("\nAnimals \tName \tAge \tColor");
        for (int i = 0; i < count; i++)
        {
            Console.WriteLine("\t" + newAnimals[i].name + "\t" + newAnimals[i].age + "\t" + newAnimals[i].color);
        }

        Console.ReadLine();
    }
}

Answer 1

var newAnimals = new List<Animals>(count); creates an empty list with specific Capacity (the total number of elements the internal data structure can hold without resizing)

As it says in MSDN about this constructor:

Initializes a new instance of the List class that is empty and has the specified initial capacity.

You need to use Add method to add elements to the list.

newAnimals.Add (new Animal() {id = 1, name = "name"});

Answer 2

Since you didn't add any items to your list newAnimals , it is empty, and thus it has no item on index 0.

Create an instance of Animal and then Add it (I renamed the class name, since it is a singular):

Animal animal = new Animal();

// do you magic

newAnimals.Add(animal);

After this, you can retrieve the item at index 0.