C# List<T> 找出类中某个重复属性变量

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在List<T>中，找出类A中具有相同Phone属性的对象，并输出这些对象的ID值；

代码如下：

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace Demo{    class A    {        public int ID;        public int Phone;    }    class Program    {        void PrintResult()        {            List<A> aList = new List<A>()            {                new A(){ ID = 1, Phone= 123 },                new A(){ ID = 2, Phone= 222 },                new A(){ ID = 3, Phone= 333 },                new A(){ ID = 4, Phone= 123 },            };            var result = from r in aList                         group r by r.Phone into g                         where g.Count() > 1                         select g;            //遍历分组结果集            foreach (var item in result)            {                foreach (A u in item)                {                    Console.WriteLine("ID: " + u.ID);                }            }        }          public static void Main()        {            Program program = new Program();            program.PrintResult();            Console.ReadKey();        }    }}

结果如下：

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