C# List集合分组去重并保留最新的数据

 class Program
    {
        static void Main(string[] args)
        {
            List<Person> list = new List<Person>
            {
                new Person
                {
                    id = 1,
                    name = "李小龙",
                    date = "2021-10-21"
                },
                 new Person
                {
                    id = 1,
                    name = "李小龙",
                    date = "2021-11-21"
                },
                  new Person
                {
                    id = 2,
                    name = "李世超",
                    date = "2021-10-21"
                }
            };
            //分组去重保留最新数据
            List<Person> newList = list.GroupBy(P => P.id).Select(P => P.OrderByDescending(P => P.date).First()).ToList();

            foreach (var item in newList)
            {
                Console.WriteLine($"人员编号：{item.id} 人员名称：{item.name} 日期：{item.date}");
            }
            Console.ReadKey();
        }

        public class Person
        {
            /// <summary>
            /// 人员编号
            /// </summary>
            public int id { get; set; }

            /// <summary>
            /// 人员名称
            /// </summary>
            public string name { get; set; }

            /// <summary>
            /// 日期
            /// </summary>
            public string date { get; set; }
        }
    }