Linq在Array,List,Dictionary中的应用

Linq在Array,List,Dictionary中的应用

今天在实际工作中需要对array,list,dictionary进行排序,试一试linq,发现非常好用,代码如下:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

namespace Test
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello world!");
            string inputStr = " abf  dcf        frgt    ";
            inputStr = Regex.Replace(inputStr.Trim(), " {2,}", " ");
            Console.WriteLine(inputStr);

            int[] num = { 1, 2, 3, 4, 5, 5, 6, 1, 3, 2 };
            //Array.Sort(num);
            var nums = (from l in num orderby l select l).ToArray();
            Console.Write("Array:\n");
            foreach (int i in nums)
                Console.Write(i.ToString());
            Console.Write("\nList:\n");
            List<int> list = new List<int>() {1,2,1,9,3,2,7 };
            list = (from l in list orderby l select l).ToList();
            foreach (var l in list)
                Console.Write(l);
            Dictionary<int, int> counts = new Dictionary<int, int>() { {1,2},{2,3},{3,1}};
            //var results = (from d in counts orderby d.Value descending select d).Take(2).ToDictionary(k => k.Key, v => v.Value);
            var results = (from d in counts orderby d.Value descending select d.Key).Take(2).ToArray();
            Console.Write("\nDictionary:\n");
            foreach (var d in results)
                Console.WriteLine(d);
            
            Console.ReadKey();
        }
    }
}