Make randomized string equality comparers implement IAlternateEqualityComparer - #104252
#104252Merged
stephentoub merged 2 commits intoJul 2, 2024
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Make randomized string equality comparers implement IAlternateEqualityComparer#104252stephentoub merged 2 commits intodotnet:maindotnet/runtime:mainfrom stephentoub:fixrandomcomparersstephentoub/runtime:fixrandomcomparersCopy head branch name to clipboard
stephentoub merged 2 commits into
dotnet:maindotnet/runtime:mainfrom
stephentoub:fixrandomcomparersstephentoub/runtime:fixrandomcomparersCopy head branch name to clipboard
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When
Dictionary<string,TValue>andHashSet<string>upgrade from a non-randomized comparer to a randomized comparer, they don't just switch to usingStringComparer.Xx... for an extra layer of protection, they create a dedicated comparer with its own random seed rather than sharing the global one. This is accomplished with a couple of dedicated comparer types. When I added IAlternateEqualityComparer implementations to all the things, I missed these two cases. That means when if a dictionary/hashset experienced enough collisions to upgrade, it could lose its ability to perform alternate key lookups. This PR just fixes those two stragglers.(This will not pass CI until #104202 is merged, as the tests here expect that the default comparer supports alternates.)