c# - 不同平台上的 string.StartsWith 不一致

Question

string.StartsWith 和此代码段(针对 .net core 2.x)的文档:

This method compares the value parameter to the substring at the beginning of this string that is the same length as value, and returns a value that indicates whether they are equal. To be equal, value must be an empty string (String.Empty), must be a reference to this same instance, or must match the beginning of this instance. This method performs a comparison using the specified casing and culture.
https://learn.microsoft.com/en-us/dotnet/api/system.string.startswith?view=netcore-2.1

static void Main(string[] args)
    {
        var unicodeCtrl = "\u0000";
        var str = "x";
        Console.WriteLine($"Is it empty     => {unicodeCtrl == string.Empty}");
        Console.WriteLine($"Lenghts         => {str.Length} {unicodeCtrl.Length}");
        Console.WriteLine($"Are they equal  => {str == unicodeCtrl}");
        Console.WriteLine($"Are they ref eq => {Object.ReferenceEquals(str, unicodeCtrl)}");
        Console.WriteLine($"Contains        => {str.Contains(unicodeCtrl)}");
        Console.WriteLine($"Starts with     => {str.StartsWith(unicodeCtrl)}");
    }

它在 Windows 上产生预期的结果:

Is it empty     => False  Lenghts         => 1 1Are they equal  => False  Are they ref eq => False  Contains        => False  Starts with     => False

但是在 Linux 上运行时(通过 docker)结果是:

Is it empty     => FalseLenghts         => 1 1Are they equal  => FalseAre they ref eq => FalseContains        => FalseStarts with     => True

你会认为这是一个错误吗？
平台依赖行为？

请注意，我不是在问如何让它工作(更改为 str.StartsWith(unicodeCtrl,StringComparison.OrdinalIgnoreCase))但如果您认为这是有意/正确的行为。

编辑:我尝试在 Linux 上匹配我的本地语言环境，但没有任何区别。我尝试了默认的 C (en-US-POSIX) 和 pl_PL.UTF8

Answer 1

这是 Windows 和 Linux/Unix 之间的一个已知差异:在 Unix 平台上，空值没有“权重”。此处 .NET 的行为是按设计来匹配平台期望，而不是提供一致性。如果您希望空值“计数”，则必须使用序数比较。

参见此处:https://github.com/dotnet/coreclr/issues/2051#issuecomment-277005422

这里:https://github.com/dotnet/corefx/pull/29935/files#diff-91724393075e1a7718d3521655506742R1399