/// <summary>
/// 判断数字集合是否是连续的
/// </summary>
/// <returns></returns>
public bool IsContinuous(List<int> numList)
{
    numList.Sort((x, y) => -x.CompareTo(y));//降序
    bool result = false;

    for (int i = 0; i < numList.Count(); i++)
    {
        if (numList[i] - numList[i + 1] == 1)
            result = true;
        else
        {
            result = false;
            break;
        }
    }
    return result;
}