List(暂存)

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using System;using System.Collections.Generic;using System.Linq;namespace ListTest{    class Program    {        protected static void Main(string[] args)        {            List<string> strs1 = new List<string> { "1", "2", "3", "1", "4" };            List<string> strs2 = new List<string> { "1", "0", "3", "1", "4" };            List<User> us = new List<User>();            us.Add(new User(Guid.Empty, "1111"));            us.Add(new User(Guid.NewGuid(), "2222"));            us.Add(new User(Guid.NewGuid(), "2222"));            us.Add(new User(Guid.NewGuid(), "3333"));            List<User> us2 = new List<User>();            us2.Add(new User(Guid.Empty, "1111"));            us2.Add(new User(Guid.Empty, "2222"));            us2.Add(new User(Guid.NewGuid(), "222423w5"));            //List去除重复            List<User> delegateList = us.Distinct(new Compare<User>(delegate(User x, User y) { if (null == x || null == y) return false; return x.UserName == y.UserName; })).ToList();            //List去重复            var strs = strs1.Except(strs2).ToList();            foreach (var item in delegateList)            {                Console.WriteLine(item.UserName);            }            //List取交集            strs = strs1.Intersect(strs2).ToList();            //foreach (var item in strs)            //{            //    Console.WriteLine(item);            //}            //List取交集            List<User> delegateList2 = us.Intersect(us2, new Compare<User>(delegate(User x, User y) { if (null == x || null == y) return false; return x.UserName == y.UserName; })).ToList();            //foreach (var item in delegateList2)            //{            //    Console.WriteLine(item.UserName);            //}                        Console.ReadLine();        }    }    public class User    {        public User() { }        public User(Guid uid, string uname)        {            UserId = uid;            UserName = uname;        }        public Guid UserId { get; set; }        public String UserName { get; set; }    }    public delegate bool EqualsComparer<T>(T x, T y);    public class Compare<T> : IEqualityComparer<T>    {        private EqualsComparer<T> _equalsComparer;        public Compare(EqualsComparer<T> equalsComparer)        {            this._equalsComparer = equalsComparer;        }        public bool Equals(T x, T y)        {            if (null != this._equalsComparer)                return this._equalsComparer(x, y);            else                return false;        }        public int GetHashCode(T obj)        { return obj.ToString().GetHashCode(); }    }}
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