C# lambda 去除重复GroupBy 查找最大记录一条数据

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public class Student         {             public int ID { get; set; }               public string Name { get; set; }               public int Age { get; set; }               public DateTime CreateTime { get; set; }         }         static void Main(string[] args)         {             List<Student> lsStudent = new List<Student>()             {                 new Student { ID = 1 ,Name = "小例子", Age = 25, CreateTime = Convert.ToDateTime("2021-06-29") },                 new Student { ID = 2, Name = "小例子", Age = 18, CreateTime = Convert.ToDateTime("2021-06-23") },                 new Student { ID = 2, Name = "大傻逼", Age = 13, CreateTime = Convert.ToDateTime("2021-06-28") },                 new Student { ID = 2, Name = "小涉笔", Age = 23, CreateTime = Convert.ToDateTime("2021-06-21")},                 new Student { ID = 1, Name = "大师傅", Age = 22, CreateTime = Convert.ToDateTime("2021-06-27") }             };               var luocore = lsStudent.GroupBy(x => x.ID).Select(s => s.OrderByDescending(x => x.CreateTime).FirstOrDefault()).ToList();             Console.ReadKey();         }