LINQ——分组

		List<int> numbers = new List<int>() { 11, 18, 23, 24, 27, 31, 32, 35, 36 };
        IEnumerable<IGrouping<int,int>> query = from num in numbers
                                                group num by num % 2;
        foreach (var group in query)
        {
            foreach (int i in group)
            {
                Console.Write(i + ", ");
            }
            Console.WriteLine();
        }