相关疑难解决方法(0)

在探索最近的Linq问题时,我注意到算法似乎相当慢.深入挖掘我注意到它不是linq代码,但结果的输出后来耗费了很长时间.(感谢Marc Gravel顺便说一句,我已经看过了最简单的Linq.)

码:

        DateTime dt = DateTime.Now;
        Console.WriteLine("Alg Start " + dt.Second + "." + dt.Millisecond);

        var qry = from l in Enumerable.Range(100000, 999999)
                  let s = l.ToString()
                  let sReversed = new string(s.Reverse().ToArray())
                  from i in Enumerable.Range(3, 9)
                  let t = (l * i).ToString()
                  where t == sReversed
                  select new { l, i };

        dt = DateTime.Now;
        Console.WriteLine("Alg End " + dt.Second + "." + dt.Millisecond);

        foreach (var row in qry)
            Console.WriteLine("{0} x {1} = {2}", row.l, row.i, …