LINQ操作数组（交集,并集,差集,最值,平均,去重复）

static void Main(string[] args)
{
    int[] a = { 1, 2, 3, 4, 5, 6, 7 };
    int[] b = { 4, 5, 6, 7, 8, 9, 10 };
    int[] c = { 1, 2, 3, 3, 4, 1, 2, 4, 6, 1, 6, 5 };

    // 交集
    var fuck = a.Intersect(b);

    // 并集
    var shit = a.Union(b);

    // a有b没有的
    var diff1 = a.Except(b);

    // b有a没有的
    var diff2 = b.Except(a);

    var max = a.Max();
    var min = a.Min();
    var avg = a.Average();
    var dis = c.Distinct();

    Print(fuck);
    Print(shit);
    Print(diff1);
    Print(diff2);
    Console.WriteLine(max);
    Console.WriteLine(min);
    Console.WriteLine(avg);
    Print(dis);

    Console.ReadKey();
}

private static void Print(IEnumerable<int> list)
{
    foreach (var item in list)
    {
        Console.Write(item + " ");
    }
    Console.WriteLine();
}

my-code

 DateTime dt1 = DateTime.Now;
            string filePath = "c:\\100w.txt";
            string filePathBlack = "c:\\100.txt";
            var mobiles = Reader(filePath);
            var black = Reader(filePathBlack);
            var mobileToDis = mobiles.ToList().Distinct();//去重

            var mobileToBlack = mobileToDis.Except(black);//去黑名单

            //去不规则手机号
            var newMobiles = System.Linq.Enumerable.Where(mobileToBlack, n => n.ToString().Length >= 11);

            int count = newMobiles.Count();
            IDictionary<string, string> dic = new Dictionary<string, string>();
            foreach (var item in newMobiles)
            {
                dic.Add(item, item);
            }
            var dt2 = DateTime.Now;
            Console.Write((dt2-dt1).TotalMilliseconds);
            //Wirte(mobiles);
            Console.Read();

 

一些参考：

http://msdn.microsoft.com/zh-cn/library/bb397894.aspx

http://msdn.microsoft.com/en-us/library/system.linq.enumerable.intersect.aspx

出处：http://diaosbook.com/