"aaaa" .StartsWith("aaa")返回false [英] "aaaa".StartsWith("aaa") returns false

问题描述

如果这不是错误，那么谁能解释这个现象的原因吗?实际上，似乎每个奇数个字母都将返回false:

If this is not a bug, can anyone then explain the reason behind this behavior? Indeed it seems that every odd number of letters will return false:

string test = "aaaaaaaaaaaaaaaaaaaa";
Console.WriteLine(test.StartsWith("aa"));
Console.WriteLine(test.StartsWith("aaa"));
Console.WriteLine(test.StartsWith("aaaa"));
Console.WriteLine(test.StartsWith("aaaaa"));
Console.WriteLine(test.StartsWith("aaaaaa"));
Console.WriteLine(test.StartsWith("aaaaaaa"));

在丹麦系统上执行时，

产生以下输出:

yields following output when executed on a Danish system:

True
False
True
False
True
False

推荐答案

这肯定是由于您当前的文化所致. 您可能在丹麦语中，aa被认为是字母. 如果您尝试更改文化..或案例，它将起作用.

This is certainly due to your current culture. You may be in Danish in which aa is considered a letter. If you try changing the culture.. or the case, it shall work.

我想我还记得匈牙利文化和信件协会的类似行为

I think I remember similar behaviour with hungarian cultures and letter associations

看看带有丹麦文字的String StartsWith()问题

示例:

using System;
using System.Globalization;

namespace Demo
{
    public static class Program
    {
        public static void Main(string[] args)
        {
            System.Threading.Thread.CurrentThread.CurrentUICulture = new CultureInfo("da-DK");
            System.Threading.Thread.CurrentThread.CurrentCulture = System.Threading.Thread.CurrentThread.CurrentUICulture;
            string test = "aaaaaaaaaaaaaaaaaaaa";
            Console.WriteLine(test.StartsWith("aa"));
            Console.WriteLine(test.StartsWith("aaa"));
            Console.WriteLine(test.StartsWith("aaaa"));
            Console.WriteLine(test.StartsWith("aaaaa"));
            Console.WriteLine(test.StartsWith("aaaaaa"));
            Console.WriteLine(test.StartsWith("aaaaaaa"));
        }
    }
}

这将打印出OP的声明.

This prints what the OP claims.

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