c# - 按字母顺序排列字符串

Question

我正在使用 C# 读取一个 .txt 文件，这个文件有一个单词列表，我需要按字母顺序对列表进行排序

static void Main(string[] args)
{
    StreamReader objReader = new StreamReader(
        @"C:\Users\thoma\Documents\Visual Studio 2019\Backup Files\data.txt");

    string orden = "";
    ArrayList arrText = new ArrayList();

    while (orden != null)
    {
        orden = objReader.ReadLine();
        if (orden != null) arrText.Add(orden);
    }
    objReader.Close();

    foreach (string sOutput in arrText)
        Console.WriteLine(sOutput);

    Console.WriteLine("Order alphabetically descendant press 'a': ");
    Console.WriteLine("Ordener ascending alphabetical press 'b': ");

    orden = Console.ReadLine();

    switch (orden)
    {
        case "a":
             string ordenado = new String(orden.OrderBy(x => x).ToArray());
            Console.WriteLine(ordenado);
            break;
        case "b":
            Console.WriteLine("");
            break;
    }

    Console.ReadLine();
}

这是我目前拥有的代码。 .txt 文件显示它没有问题，但是当输入 while 语句并按选项时，它不会返回任何内容。

在arrText中存储了.txt文件的单词，这些单词是:'in' 'while' 'are'。

我需要在 while 语句中按下 'a' 键时，按字母顺序显示单词列表:'are' 'in' 'while'。

Answer 1

我会提供一个更好的分离和缩短的版本:

    var choices = new Dictionary<ConsoleKey, bool?>()
    {
        { ConsoleKey.D1, true },
        { ConsoleKey.D2, false }
    };

    var ascending = (bool?)null;
    while (ascending == null)
    {
        Console.WriteLine("Please choose between ascending and descending order.");
        Console.WriteLine("Press 1 for ascending");
        Console.WriteLine("Press 2 for descending");
        var choice = Console.ReadKey(true);
        ascending = choices.ContainsKey(choice.Key) ? choices[choice.Key] : null;
    }

    var lines = File.ReadAllLines("c:/data.txt");
    lines = ascending.Value
        ? lines.OrderBy(x => x).ToArray()
        : lines.OrderByDescending(x => x).ToArray();

    foreach (var line in lines)
    {
        Console.WriteLine(line);
    }
    Console.WriteLine("Press any key to continue...");
    Console.ReadKey(true);

---

甚至这样:

    var choices = new Dictionary<ConsoleKey, Func<string[], string[]>>()
    {
        { ConsoleKey.D1, xs => xs.OrderBy(x => x).ToArray() },
        { ConsoleKey.D2, xs => xs.OrderByDescending(x => x).ToArray() }
    };

    var ascending = (Func<string[], string[]>)null;
    while (ascending == null)
    {
        Console.WriteLine("Please choose between ascending and descending order.");
        Console.WriteLine("Press 1 for ascending");
        Console.WriteLine("Press 2 for descending");
        var choice = Console.ReadKey(true);
        ascending = choices.ContainsKey(choice.Key) ? choices[choice.Key] : null;
    }

    var lines = ascending(File.ReadAllLines("c:/data.txt"));

    foreach (var line in lines)
    {
        Console.WriteLine(line);
    }
    Console.WriteLine("Press any key to continue...");
    Console.ReadKey(true);