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 ...
今天在家看了一下get='_blank'>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 }
原标题:C# Linq排序
关键词:C#
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