Use `StringUtil.ToLowerInvariant()`/`StringUtil.ToUpperInvariant()` on .NET Framework - #9180

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andrewlock wants to merge 5 commits into

andrew/use-new-tolowerinvariant

Commits on Sep 8, 2026

Add .NET Core versions of StringUtil for symmetry
andrewlock
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8be6225
Widen StringUtil case-conversion helpers to accept null
andrewlock
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7285e8f
Ban string.ToUpperInvariant()/ToLowerInvariant() in Datadog.Trace on net461
andrewlock
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7ddc434
Migrate string.ToUpperInvariant()/ToLowerInvariant() call sites to StringUtil
andrewlock
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2b8c963
[SourceGenerators] Route generated EnumExtensions fallback through StringUtil on .NET Framework
andrewlock
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a715a1a