C# 长度为100的int数组 插入1-100的随机数 不能重复

        private int[] GetRandomArray1(int len = 100)
        {
            int[] arr = new int[len];
            for (int i = 0; i < len; i++)
            {
                arr[i] = i + 1;
            }

            Random r = new Random();
            for (int i = 0; i < len; i++)
            {
                var nowIndex = r.Next(0, len);

                int nowTemp = arr[nowIndex];
                arr[nowIndex] = arr[i];
                arr[i] = nowTemp;
            }

            return arr;
        }