//查询所有武学级别大于8的武林高手

            //var res = new List<MartialArtsMaster>();

            //foreach (var temp in masterList)

            //{

            //    if (temp.Level > 8)

            //    {

            //        res.Add(temp);

            //    }

            //}

            //1,使用LINQ做查询( 表达式写法)

            //var res = from m in masterList //m是别名，是用来做限制的

            //          //from后面设置查询的集合

            //          where m.Level > 8 && m.Menpai=="丐帮" //通过&&添加并列的条件

            //          //where后面跟上查询的条件

            //          select m;//表示m的结果结合返回，表示你要返回的什么东西，这个是全部，还可以只返回名字

            //2,扩展方法的写法

            //var res = masterList.Where(Test1);

            //var res = masterList.Where(m => m.Level > 8 && m.Menpai=="丐帮" );

            //3,LINQ 联合查询

            //取得所学功夫的杀伤力大于90 的武林高手

            //var res = from m in masterList

            //    from k in kongfuList

            //    where m.Kongfu == k.Name && k.Power > 90

            //    //select new {master = m, kongfu = k};//创建一个临时对象，包括master 和 kongfu 两个字段

            //    select m;

            //扩展方法用法

            //var res =

            //    masterList.SelectMany(m => kongfuList, (m, k) => new {master = m, kongfu = k})

            //        .Where(x => x.master.Kongfu == x.kongfu.Name && x.kongfu.Power>90 );

            //4,对查询结果做排序 orderby (descending)

            //var res = from m in masterList

            //          //from后面设置查询的集合

            //          where m.Level > 8 && m.Menpai == "丐帮" //通过&&添加并列的条件

            //          //orderby m.Age descending

            //          orderby m.Level,m.Age //按照多个字段进行排序，如果字段的属性相同，就按照第二个属性排序

            //          //where后面跟上查询的条件

            //          select m;//表示m的结果结合返回

            //var res = masterList.Where(m => m.Level > 8 && m.Menpai == "丐帮").OrderBy(m => m.Age);

            //var res = masterList.Where(m => m.Level > 8).OrderBy(m => m.Level).ThenBy(m => m.Age);

            //5,join on 集合联合

            //var res = from m in masterList

            //    join k in kongfuList on m.Kongfu equals k.Name

            //    where k.Power>90

            //    select new {master = m, kongfu = k};

            //6,分组查询 into groups (把武林高手按照所学功夫分类，看一下那个功夫修炼的人数最多)

            //var res = from k in kongfuList

            //    join m in masterList on k.Name equals m.Kongfu

            //    into  groups

            //    orderby groups.Count()

            //    select new {kongfu = k, count = groups.Count() };

            //7,按照自身字段分组 group

            //var res = from m in masterList

            //    group m by m.Kongfu

            //    into g

            //    select new {count = g.Count(), key = g.Key};//g.Key Key表示是按照那个属性分的组

            //8,量词操作符 any all 判断集合中是否满足某个条件

            //bool res  = masterList.Any(m => m.Menpai == "长留");

            //Console.WriteLine(res);

            bool res = masterList.All(m => m.Menpai == "丐帮");

            Console.WriteLine(res);

            //foreach (var temp in res)

            //{

            //    Console.WriteLine(temp);

            //}

            Console.ReadKey();

        }

        //过滤方法

        static bool Test1(MartialArtsMaster master)

        {

            if (master.Level > ) return true;

            return false;

        }