C# Linq排序

今天在家看了一下linq，实践了一下书中代码，发现排序和查重的先后顺序太重要了。

 1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5  6 namespace LinqLearning 7 { 8     class Program 9     {10         private static int[] GenerateLotsOfNumbers(int count)11         {12             Random generator = new Random(0);13             int[] result = new int[count];14             for (int i = 0; i < count; i++)15             {16                 result[i] = generator.Next();17             }18             return result;19         }20 21         static void Main(string[] args)22         {23             int[] numbers = GenerateLotsOfNumbers(12345678);24 25             var queryResults = from n in numbers26                                where n < 100027                                orderby n descending28                                select n;29             Console.WriteLine("查询语法排序结果：");30             DateTime start = DateTime.Now;31             foreach (var item in queryResults)32                 Console.WriteLine(item);33             Console.WriteLine("消耗时间：{0}",DateTime.Now-start);34 35             var queryResult = numbers.OrderByDescending(n => n).Where(n => n < 1000);36             Console.WriteLine("方法排序结果（排序字段在前）：");37             start = DateTime.Now;38             foreach (var item in queryResult)39                 Console.WriteLine(item);40             Console.WriteLine("消耗时间：{0}", DateTime.Now - start);41 42             var query = numbers.Where(n => n < 1000).OrderByDescending(n => n);43             Console.WriteLine("方法排序结果（排序字段在后）：");44             start = DateTime.Now;45             foreach (var item in query)46                 Console.WriteLine(item);47             Console.WriteLine("消耗时间：{0}", DateTime.Now - start);48 49             Console.ReadKey();50         }51     }52 }