C# 按字母顺序对字符串数组进行排序，注意将以大写字母开头的字符串放在首位。第一的

Question

1) 有一个 Kata 规定对字符串数组中的所有字符串进行排序，然后取第一个单词并在每个字母之间添加 ***：https://www.codewars.com/kata/sort-and-star

2) 例如：

(1) 给出：

bitcoin
take
over
the
world
maybe
who
knows
perhaps

(2) 订购后：

bitcoin
knows
maybe
over
perhaps
take
the
who
world

(3) return 结果是：

b***i***t***c***o***i***n

3) 但是我面临的困难如下：我们如何表达 'order first the words which start with capital letter'?

4) 我试过下面的代码：

using System;
public class Kata
{
  public static string TwoSort(string[] s)
  {
  foreach(string str in s){
    Console.WriteLine(str);
  }
  Console.WriteLine("");
  Array.Sort(s);
  foreach(string str in s){
    Console.WriteLine(str);
  }

  Console.WriteLine("");

  string firstWord = s[0];
  string result = "";


  foreach(char letter in firstWord){
    result += letter + "***";

  }
  Console.WriteLine(result.Substring(0, result.Length - 3));
    return result.Substring(0, result.Length - 3);
  }  
}

5) 例如：

(1) 给出如下数组：

Lets
all
go
on
holiday
somewhere
very
cold

(2) 订购后：

all
cold
go
holiday
Lets
on
somewhere
very

(3) 当前错误结果：

a***l***l

(4) 预期正确结果：

L***e***t***s

我也看过：

how to sort a string array by alphabet?

Sorting an array alphabetically in C#

Answer 1

您应该指定比较器，例如（Linq解决方案）：

  string[] source = new string[] {
    "Lets",
    "all",
    "go",
    "on",
    "holiday",
    "somewhere",
    "very",
    "cold",
  };

  // StringComparer.Ordinal: order by Ascii values; capital letters < small letters 
  var ordered = source
    .OrderBy(item => item, StringComparer.Ordinal);

  Console.Write(string.Join(", ", ordered));

结果：

  Lets, all, cold, go, holiday, on, somewhere, very

为了获得想要的结果（如果您坚持要订购），您可以输入

  var result = string.Join("***", source
    .OrderBy(item => item, StringComparer.Ordinal) 
    .First()
    .Select(c => c)); // <- turn string into IEnumerable<char> 

  Console.Write(result);

结果：

  L***e***t***s

如果您想继续使用当前代码，请将 Array.Sort(s); 更改为

  Array.Sort(s, StringComparer.Ordinal);

Answer 2

您可以指定 Ordinal 字符串比较器将结果先大写再小写。

Array.Sort(s, StringComparer.Ordinal);

Answer 3

如果是Class Feature like "Name", 可以使用下面的

if (isAscend)
    List1.Sort((x, y) => x.Name.CompareTo(y.Name));
else
    List1.Sort((x, y) => -x.Name.CompareTo(y.Name));

您可以获得按“名称”排序的 Class 列表。

C# 按字母顺序对字符串数组进行排序，注意将以大写字母开头的字符串放在首位。第一的

C# Sort string array alphabetically taking care of putting strings which start with capital letter first. first

c#

arrays

sorting

string

alphabetical