Unity 生成不重复随机数

public int[] GetRandomSequence2(int total, int n)
    {
        //随机总数组
        int[] sequence = new int[total];
        //取到的不重复数字的数组长度
        int[] output = new int[n]; 
        for (int i = 0; i < total; i++)
        {
            sequence[i] = i;
        }
        int end = total - 1;
        for (int i = 0; i < n; i++)
        {
            //随机一个数，每随机一次，随机区间-1
            int num = Random.Range(0, end + 1);
            output[i] = sequence[num];
            //将区间最后一个数赋值到取到数上
            sequence[num] = sequence[end];
            end--;
            //执行一次效果如：1，2，3，4，5 取到2
            //则下次随机区间变为1,5,3,4;
        }
        return output;
    }

 public class MathMode
    {
        //从一个数组中取不重复随机数(不重复)
        public static T GetNoRepeatRandomInList(ref List list)
        {
            int index = UnityEngine.Random.Range(0, list.Count);
            T result = list[index];
            list.RemoveAt(index);
            return result;
        }
    }