C \ # List 방법의 사용

  class Collection
    {
        /// 

        ///     ：  
        /// 
        List list = new List();

       
        public static void Test()
        {
            Collection c = new Collection();
            c.listTest();
            Console.ReadKey();
        }

        private void InitList()
        {
            Student st1 = new Student("  ", 17, 1000);
            Student st2 = new Student("  ", 20, 1001);
            Student st3 = new Student("  ", 18, 1000);
            Student st4 = new Student("  ", 19, 1001);
            Student st5 = new Student("  ", 18, 1003);
            Student st6 = new Student("  ", 21, 1002);
            list.Add(st1);
            list.Add(st2);
            list.Add(st3);
            list.Add(st4);
            list.Add(st5);
            list.Add(st6);
        }

        public void listTest()
        {
            this.InitList();

            foreach (var item in list)
            {
                Console.WriteLine(item);
            }

           
            Console.WriteLine("
*****  Id  *****");
            var query = list.GroupBy(pet => pet.Id);
            // IEnumerable> query = list.GroupBy((st) => { return st.Id; });
            // IEnumerable> query = list.GroupBy(ListGroud);         
            foreach (var item in query)
            {
                List stt = item.ToList();
                Console.WriteLine("key::" + item.Key);
                foreach (var item2 in stt)
                {
                    Console.WriteLine(item2);
                }
                Console.WriteLine("");
            }

            Console.WriteLine("
           :" + list.BinarySearch(list[2]));
            Console.WriteLine("
        A,     A key     （      ）:");

            var dictionary2 = list.ToDictionary(st => st.Name);
            foreach (var item in dictionary2)
            {
                Console.WriteLine("key:" + item.Key + " ->value:" + item.Value);
            }
            Console.WriteLine("
      :");
            var tempList = list.Where(a => a.Name.Contains(" ") || a.Name.Contains(" ")).ToList();
            // List tempList = list.FindAll(st => st.Name.Contains(" ") || st.Name.Contains(" "));
            foreach (var item in tempList)
            {
                Console.WriteLine(item);
            }
            Console.WriteLine("
         ：" + list.Sum(st => st.Age));

          ;

            list.Take(3); //     3 

            list.Skip(4); //  （   4   ）

            var kk = list.GetRange(1, 3);  //  1  ，      ，     。

            bool b = list.Exists(st => st.Name == "  ");  //          

            var templist = list.OrderBy(st => st.Id);  //        

            list.Sort();  //        IComparable  
            foreach (var item in templist)
            {
                Console.WriteLine(item);
            }
           int maxAge= list.Max(st => st.Age);
         Student ss=  list.Max();
        }

        private int ListGroud(Student st)
        {
            return st.Id;
        }


    }

    public class Student:IComparable
    {       
        public int Age;
        public int Id;
        public string Name;

        public Student(string name, int age, int Id)
        {
            this.Name = name;
            this.Age = age;
            this.Id = Id;
        }

        public override string ToString()
        {
            return string.Format("  ：{0}、  ：{1}、  ：{2}", this.Id, this.Name, this.Age);
        }

        public int CompareTo(object obj)
        {
            return this.Id > ((Student)obj).Id ? 1 : -1;
        }
    }