Add `Timer` class polyfill for .NET Standard 1.0–1.1 via `Task.Delay`#81

Merged

Tyrrrz merged 15 commits intomasterfrom

copilot/add-timer-class-polyfill

Feb 20, 2026

Commits on Feb 19, 2026

Initial plan
Copilot
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Add Timer class polyfill for .NET Standard 1.0-1.1 using Task.Delay

Copilot
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Tyrrrz
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Remove Timer tests (can't run against netstandard 1.0-1.1 targets)

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Tyrrrz
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Address review feedback on Timer polyfill

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Fix callback exception surfacing in Timer polyfill

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Inline ValidateTimes; fix Dispose CTS leak

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Update PolyShim/NetCore10/Timer.cs

Tyrrrz
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Copilot
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Fix period==0 behavior, Dispose/Change race, and null callback validation

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Refactor Start to accept CancellationToken instead of CancellationTokenSource

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Inline CreateAndSchedule into Schedule; keep CreateCts for field initializer only

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Remove CreateCts by making _cts nullable with lazy init via primary constructor refactor

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Move Start after CTS exchange; null-check callback in full-arg constructor

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Update PolyShim/NetCore10/Timer.cs

Tyrrrz
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Copilot
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Guard cts.Cancel() against ObjectDisposedException in Dispose/Schedule race recheck

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Guard oldCts.Cancel() against ObjectDisposedException in Schedule

Copilot
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Tyrrrz
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