c# 中的列表以及如何阅读它们？

我有一个相当简单的问题（可能）如何计算具有给定值的列表中的值？例如，我有一个非常大的列表，我想读取包含某个变量数量的行。

print(dots[i]);

其中dots 是一个列表其中i 是行号。

Unity 给出了一个非严重错误：

ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.

参数名称：索引

从中，我意识到列表中没有这样的行，但我通过调试检查了它 - 值是 64，它在列表中。谢谢你。

using System.Collections;
using System.Collections.Generic;
using UnityEngine;


public class PlanetTerrain : MonoBehaviour
{
    public static int seed;
    public static Color color;
    public static bool deathGas = false;
    public static float amplitude;
    public static float freq;

    public int dotcount = 0;
    public List<Vector2> chunkdots;
    public GameObject tile;
    public int worldSize;

    private void Awake()
    {
        seed = Random.Range(1, 10000);
        amplitude = Random.Range(8, 100);
        freq = Random.Range(83, 100);

        Cursor.lockState = CursorLockMode.Locked;
    }

    private void Start()
    {
        SetPoints();
        StartCoroutine(Generate());
    }
    void SetPoints()
    {
        for (int x = 0; x < worldSize; x++)
        {
            for (int z = 0; z < worldSize; z++)
            {
                dotcount++;
                Debug.Log(dotcount);
                chunkdots.Add(new Vector2(x * 16, z * 16));
            }
        }


    }

    IEnumerator Generate()
    {
        yield return new WaitForSeconds(0.1f);

        for (int i = 0; i < dotcount; i++)
        {
            int ic = 0;
            ic = dotcount;
            Debug.Log("ic = " + ic);
            Instantiate(tile, new Vector3(chunkdots[ic].x, 0, chunkdots[ic].y), Quaternion.identity);

        }
    }
}