生成不重复随机数

/// <summary>
        /// 生成不重复随机数
        /// </summary>
        /// <param name="total">随机数大小</param>
        /// <returns></returns>
        public static int[] GetRandomSequence2(int total)
        {

            int[] sequence = new int[total];
            int[] output = new int[total];

            for (int i = 0; i < total; i++)
            {
                sequence[i] = i;
            }

            Random random = new Random();

            int end = total - 1;

            for (int i = 0; i < total; i++)
            {
                int num = random.Next(1, end + 2);
                output[i] = sequence[num];
                sequence[num] = sequence[end];
                end--;
            }

            return output;
        }