代码

    internal class Program
    {
        static void Main(string[] args)
        {
            List<DateTime?> dateTimes = new List<DateTime?> { null,DateTime.MinValue,DateTime.MaxValue};
            var temp = new List<DateTime?> { };
            dateTimes.Sort();
            //dateTimes.Reverse();
            foreach (var dateTime in dateTimes)
            {
                Console.WriteLine(dateTime);
            }
            Console.ReadLine();
           
        }
    }

结果