两个List的交集,补集

用linq是很好实现的

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleProgram
{
	class Program
	{
		static void Main(string[] args)
		{
		    var oneList = new List<int>();
		    var twoList = new List<int>();
            oneList.Add(1);
            oneList.Add(2);
            oneList.Add(3);
            twoList.Add(1);
            twoList.Add(2);
            twoList.Add(3);
            twoList.Add(4);
            //where (from o in oneList select o).Contains(i) 包含
            //where !(from o in oneList select o).Contains(i) 不包含
            var searchResult = from i in  twoList
                               where !(from o in oneList select o).Contains(i) 
                               select i;
            //打印到屏幕
            foreach (int num in searchResult)
            {
                Console.Write(num);
            }
            Console.Read();
		}
	}
}