C# Sort排序

#region实现IComparable的排序
class UserInfo:IComparable<UserInfo>
    {
        public int ID { get; set; }
        public int Age { get; set; }
        public string Name { get; set; }

        public int CompareTo(UserInfo other)
        {
            if (this.Age > other.Age) return 1;
            return -1;
        }
    }

//调用
 List<UserInfo> lst = new List<UserInfo>(){
                new UserInfo(){ID=1,Age=19,Name="张三"},
                new UserInfo(){ID=2,Age=17,Name="李四"},
                new UserInfo(){ID=3,Age=20,Name="王五"}
            };
            lst.Sort();
            for (int i = 0; i < lst.Count; i++)
            {
                Console.Write(lst[i].Name+":"+ lst[i].Age+"<");
            }
#endregion           

#region 实现IComparer的Sort排序
class UserInfo_SortByID:IComparer<UserInfo>
    {

        public int Compare(UserInfo x, UserInfo y)
        {
            if (x.ID < y.ID) return 1;
            return -1;
        }
    }


            List<UserInfo> lst = new List<UserInfo>(){
                new UserInfo(){ID=1,Age=19,Name="张三"},
                new UserInfo(){ID=2,Age=17,Name="李四"},
                new UserInfo(){ID=3,Age=20,Name="王五"}
            };
            lst.Sort(new UserInfo_SortByID());
            for (int i = 0; i < lst.Count; i++)
            {
                Console.Write(lst[i].Name+":"+ lst[i].Age+"<");
            }

#endregion