ToLower vs ToLowerInvariant

Question

我只是在寻找这两种方法产生不同结果的任何例子.首先,我访问msdn页面,并通过微小的更改运行代码

using System;
using System.Globalization;
using System.Linq;

class Program
{
    static void Main()
    {
        string[] words = { "Tuesday", "Sal?", "???????", "Mardi", 
                         "?????", "Martes", "??? ?????", 
                         "????????", "?????????" };
        Console.BufferHeight = 1000;
        var test = CultureInfo.GetCultures(CultureTypes.AllCultures)
                              .Select(ci =>
                                      {
                                          string[] wordsToLower = words.Select(x => x.ToLower(ci)).ToArray();
                                          string[] wordsToLowerInvariant = words.Select(x => x.ToLowerInvariant()).ToArray();
                                          return new
                                                 {
                                                     Culture = ci,
                                                     ToLowerDiffers = !wordsToLower.SequenceEqual(wordsToLowerInvariant)
                                                 };
                                      })
                              .ToArray();
        foreach (var x in test)
        {
            Console.WriteLine("Culture {0}, ToLower and ToLowerInvariant produces different results: {1}", x.Culture, x.ToLowerDiffers);
        }
        Console.WriteLine();
        Console.WriteLine("Difference exists for any ToLower call: {0}", test.Any(x => x.ToLowerDiffers));
    }
}

但在这里我遇到了一个问题:这段代码为所有现有文化产生相同的输出ToLower和ToLowerInvariant调用.

所以问题是:有任何字符串可以为此测试产生不同的结果吗？

Answer 1

尝试土耳其点缀?:

var culture = new CultureInfo("tr-TR");

string test = "?";

if (test.ToLower(culture) == test.ToLowerInvariant())
    Console.WriteLine("Same");
else
    Console.WriteLine("Different"); // Prints this!