------------------------------------------------------------------------------Person.cs
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ConsoleApplication1 { public class Person { public string Country { get; private set; } public string Name { get; private set; } public int Age { get; private set; } public Person(string country, string name, int age) { this.Country = country; this.Name = name; this.Age = age; } } }
------------------------------------------------------------------------------主程序
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { //可以用于实现了IEnumerable<T>的所有类 //一个键关联多个值 List<Person> lp = new List<Person>(); lp.Add(new Person("中国", "张飞", 40)); lp.Add(new Person("中国", "关羽", 43)); lp.Add(new Person("中国", "刘备", 45)); lp.Add(new Person("中国", "诸葛亮", 24)); lp.Add(new Person("美国", "豪威尔", 40)); lp.Add(new Person("美国", "奥巴马", 40)); lp.Add(new Person("朝鲜", "金三胖", 40)); lp.Add(new Person("印度", "印度阿三", 40)); //传入一个Person对象,返回string var t = lp.ToLookup(r => r.Country);//键为Country(国家) foreach (Person item in t["中国"])//找到所有为中国的Person对象 { Console.WriteLine(item.Name); } Console.ReadKey(); } } }
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