生成不重复的随机数

/// <summary>
    ///生成不重复的随机数
    /// </summary>
    /// <param name="Number">随机数的个数</param>
    /// <param name="minNum">随机数的下限</param>
    /// <param name="maxNum">随机数的上限</param>
    /// <returns></returns>
    public int[] GetRandomArray(int Number, int minNum, int maxNum)
    {
        int j;
        int[] b = new int[Number];
        for (j = 0; j < Number; j++)
        {
            int i = Random.Range(minNum, maxNum + 1);
            int num = 0;
            for (int k = 0; k < j; k++)
            {
                if (b[k] == i)
                {
                    num = num + 1;
                }
            }
            if (num == 0)
            {
                b[j] = i;    ///判断不相同才赋值
            }
            else
            {
                j = j - 1;
            }
        }
        return b;
    }