在不应该有范围异常的情况下继续接收范围异常的参数？

Question

我最近试图更改我在 Unity 中开发的游戏脚本之一的代码，但我一直收到针对 ColouredBallPositions[x - 1] 向我抛出的参数超出范围异常错误消息我在 for 循环中添加的值。但是，此参数不应超出范围。

这是统一控制台中显示的确切错误消息：

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

Parameter name: index System.ThrowHelper.ThrowArgumentOutOfRangeException (System.ExceptionArgument argument, System.ExceptionResource resource) (at <23c160f925be47d7a4fd083a3a62c920>:0) System.ThrowHelper.ThrowArgumentOutOfRangeException () (at <23c160f925be47d7a4fd083a3a62c920>:0) System.Collections.Generic.List`1[T].set_Item (System.Int32 index, T value) (at <23c160f925be47d7a4fd083a3a62c920>:0) SpawnPoint.Start () (at Assets/SpawnPoint.cs:43)

我试图通过 Whosebug 和互联网寻找我可能会收到此错误消息的答案，但我还没有找到我的代码为何会产生此错误消息的答案。

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

    public class SpawnPoint : MonoBehaviour
    {

        public Transform SpawnPoints;
        List<float> StarPositions = new List<float>();
        List<float> ColouredBallPositions = new List<float>();
        List<float> ColouredBallRanges = new List<float>();
        int Interact, randomSpawnPoint;
        public static bool spawnAllowed;
        ObjectPooler objectPooler;
        int index = 1;


        public void Start()
        {
            objectPooler = ObjectPooler.Instance;

            if (ScoreScript.scoreValue < 5)
            {

                Vector2 pos =                         
             Camera.main.WorldToViewportPoint(transform.position);


                for (int x = 1; x < 5; x++) // Change this to get rid of the need to generate spawnpoints
        {
            //Vector3 SpawnPos = spawnPoints[d].position;
            int NrSpawnpoints = 4;
            int NrSpaces = NrSpawnpoints + 1;
            double Xlegnth = 1.0;
            double spawnPosX = x * Xlegnth / NrSpaces;
            pos.x = (float)spawnPosX;
            pos.y = 1.3f;
            ColouredBallPositions[x - 1] = (float)spawnPosX;
            Vector2 Posi = Camera.main.ViewportToWorldPoint(pos);
            Instantiate(SpawnPoints, Posi, Quaternion.identity);

           // Debug.Log(Posi);

        }

        spawnAllowed = true;
        InvokeRepeating("SpawnAInteract", 0f, 1f);
    }

}

没有抛出异常

Answer 1

我认为这里的问题是您所指的索引不存在。

您在此处创建 ColouredBallPositions：

List<float> ColouredBallPositions = new List<float>();

下次使用就在这里：

ColouredBallPositions[x - 1] = (float)spawnPosX;

虽然ColouredBallPositions被初始化了，但是空。您实际上从未使用索引 x - 1 创建任何内容，因此索引超出范围。

在不应该有范围异常的情况下继续接收范围异常的参数？

Keep on receiving an argument of of range exception when there shouldn't be one?

c#

list

outofrangeexception

unity3d