如何使用 List<string>.Sort 按长度对字符串列表进行排序？

Question

我想按字符串的长度对字符串列表进行排序

var weasleys = new List<string>{"Bill", "Charlie", "Percy", "Fred", "George", "Ron", "Ginny"};

我知道如何使用 OrderBy，但这会返回一个副本。

weasleys.OrderBy(x => x.Length)

我更喜欢使用List<T>.Sort 进行就地排序。怎么样？

Answer 1

有一个Sort(Comparison<T>) overload 接受Comparison<T> 委托。这样，您就可以在各自的 Length 值上使用 CompareTo 方法：

weasleys.Sort((x, y) => x.Length.CompareTo(y.Length));

请注意，与 LINQ OrderBy 方法不同，Sort 将在您的意图下就地更改您的 weasleys 列表。

Answer 2

应该这样做

var weasleys = new List<string>{"Bill", "Charlie", "Percy", "Fred", "George", "Ron", "Ginny"};
var t = weasleys.OrderBy(x => x.Length).ToList<string>();

Answer 3

您可以使用数组列表来做到这一点...

public class SortStringLength : IComparer
    {
        public int Compare(Object s1, Object s2)
        {
            if (s1.ToString().Length == s2.ToString().Length)
                return String.CompareOrdinal(s1.ToString(), s2.ToString());
            if (s1.ToString().Length > s2.ToString().Length)
                return 1;
            return -1;
        }
    }

然后，使用IComparer...

static void Main(string[] args)
        {
            var weasleys = new ArrayList { "Bill", "Charlie", "Percy", 
                  "Fred", "George", "Ron", "Ginny" };
            var sortLength = new SortStringLength();
            weasleys.Sort(sortLength);

            foreach (var weasley in weasleys)
            {
                Console.WriteLine(weasley);
            }

            Console.ReadLine();
        }

有列表...

public class SortStringLength : IComparer<string>
{
    public int Compare(string x, string y)
    {
        if (x.Length == y.Length)
            return String.CompareOrdinal(x, y);
        if (x.Length > y.Length)
            return 1;
        return -1;
    }
}

和用法...

static void Main(string[] args)
        {
            var weasleys = new List<string> { "Bill", "Charlie", "Percy", 
                       "Fred", "George", "Ron", "Ginny" };
            var sortLength = new SortStringLength();
            weasleys.Sort(sortLength);

            foreach (var weasley in weasleys)
            {
                Console.WriteLine(weasley);
            }

            Console.ReadLine();
        }

Answer 4

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

public class Program
{
    public static void Main()
    {
        List<string> dictionary = new List<string>() { "aaa", "aaaa", "a", "aa" };
        var orderedDic = dictionary.Select(x => new
          {
            val = x,
            length = x.Length
          }).OrderBy(x => x.length).ToList();
        dictionary = orderedDic.Select(x => x.val).ToList();
        Console.WriteLine(string.Join(",", dictionary));
     }
}

我在这里使用的方法

1. 使用 val 和 length 属性创建了一个匿名对象列表。
2. 按长度排序。