黄聪：Loopup集合类笔记

使用Loopup集合类管理相同键值的对象集

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Lookup
{
    class Program
    {
        static void Main(string[] args)
        {
            Person graham = new Person("Graham", "Hill", "USA");
            Person emerson = new Person("Emerson", "Fittipaldi", "USA");
            Person hc = new Person("Huang", "Cong", "CA");
            List<Person> listPerson = new List<Person>() { graham, emerson, hc };

            Lookup<string, Person> Persons = (Lookup<string, Person>)listPerson.ToLookup(r => r.Counary);

            foreach (Person obj in Persons["USA"])
            {
                Console.WriteLine(obj.FirstName + " "+ obj.LastName);
            }
        }
    }

    public class Person
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Counary { get; set; }

        public Person(string first, string last,string counary)
        {
            FirstName = first;
            LastName = last;
            Counary = counary;
        }
    }
}

输出结果: