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  • c#数组用linq语句查询奇偶数并排序

    c#数组用linq语句查询奇偶数并排序

    使用LINQ和Lambda表达式根据特定条件来查询数组

     int[] names = { 8,9,22,23,7,2};
                int[] evens = names.Where(p1 => p1 % 2 == 0).OrderByDescending(p1=>p1).ToArray(); //查找所以偶数并排序
               
                Console.WriteLine("偶数:"+string.Join(",",evens));
                string evens_str = string.Join(",",evens);
                Console.WriteLine("偶数string:"+evens_str);
    
                int[] oadds = names.Where(p1 => p1 % 2 != 0).OrderByDescending(p1 => p1).ToArray();
                Console.WriteLine("偶数:" + string.Join(",", oadds));
                string evens_str1 = string.Join(",", oadds);
                Console.WriteLine("偶数string:" + evens_str1);
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    
    namespace LinqLearning
    {
        class Program
        {
            private static int[] GenerateLotsOfNumbers(int count)
            {
                Random generator = new Random(0);
                int[] result = new int[count];
                for (int i = 0; i < count; i++)
                {
                    result[i] = generator.Next();
                }
                return result;
            }
    
            static void Main(string[] args)
            {
                int[] numbers = GenerateLotsOfNumbers(12345678);
    
                var queryResults = from n in numbers
                                   where n < 1000
                                   orderby n descending
                                   select n;
                Console.WriteLine("查询语法排序结果:");
                DateTime start = DateTime.Now;
                foreach (var item in queryResults)
                    Console.WriteLine(item);
                Console.WriteLine("消耗时间:{0}",DateTime.Now-start);
    
                var queryResult = numbers.OrderByDescending(n => n).Where(n => n < 1000);
                Console.WriteLine("方法排序结果(排序字段在前):");
                start = DateTime.Now;
                foreach (var item in queryResult)
                    Console.WriteLine(item);
                Console.WriteLine("消耗时间:{0}", DateTime.Now - start);
    
                var query = numbers.Where(n => n < 1000).OrderByDescending(n => n);
                Console.WriteLine("方法排序结果(排序字段在后):");
                start = DateTime.Now;
                foreach (var item in query)
                    Console.WriteLine(item);
                Console.WriteLine("消耗时间:{0}", DateTime.Now - start);
    
                Console.ReadKey();
            }
        }
    }
    欢迎讨论,相互学习。 txwtech@163.com
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  • 原文地址:https://www.cnblogs.com/txwtech/p/15346309.html
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