我们不能在HashSet中使用StringComparison吗？

Question

C# 3.5: I can't get this code to compile:

HashSet<string> classDeclarations = new HashSet<string>(StringComparison.InvariantCultureIgnoreCase);

I get this error:

Argument 1: cannot convert from 'System.StringComparison' to 'System.Collections.Generic.IEqualityComparer'

So I can't pass a comparison?

Answer 1

StringComparison is an enum used by many string-related functions.
Since HashSet<T> has nothing to do with strings, it wouldn't make sense for it to take a StringComparison .

You need to use the static properties of the StringComparer class, which implement IEqualityComparer<String> .

Answer 2

您需要这样做

HashSet<string> myHashSet = new HashSet<string>(StringComparer.InvariantCultureIgnoreCase);