//分组查询 into groups(把武林高手按照所学功夫分类,看一下哪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()};
           
            foreach (var temp in res)
            {
                Console.WriteLine(temp);
            }
            Console.Read();