LINQ---查询变量

 1 namespace ConsoleApplication46
 2 {
 3     class Program
 4     {
 5         static void Main(string[] args)
 6         {
 7             int[] numbers = { 2, 5, 28 };
 8 
 9             IEnumerable<int> lowNums = from n in numbers     //返回枚举数
10                                        where n < 20
11                                        select n;
12 
13             int numsCount = (from n in numbers                 //返回一个数
14                              where n < 20
15                              select n).Count();
16 
17             foreach (var item in lowNums )
18             {
19                 Console.Write("{0}   ", item);
20             }
21             Console.WriteLine();
22 
23             Console.WriteLine("{0}  ", numsCount );
24         }
25     }
26 }