[release/6.0] [mono] Preserve FirstChanceExceptionEventArgs ctor #68265
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The runtime is creating the exception so we need to preserve it. See dotnet/android#6626
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@marek-safar @lambdageek can I get your sign-off on this PR so we can get it merged? |
akoeplinger
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May 5, 2022
steveisok
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Backport of #68235 to release/6.0
/cc @akoeplinger
Customer Impact
A customer reported in dotnet/android#6626 that a Xamarin Android app crashed when subscribing to the
AppDomain.CurrentDomain.FirstChanceExceptionevent when IL trimming is enabled.The reason was that the IL linker removed the
FirstChanceExceptionEventArgsconstructor since there's no reference to it in the app code. However the mono runtime tries to create it from native code. To fix this we added code to preserve the constructor.There are workarounds so this isn't critical for MAUI release.
Testing
Manual testing, made sure the
FirstChanceExceptionEventArgsconstructor is preserved when the app subscribes to theAppDomain.CurrentDomain.FirstChanceExceptionevent and trimmed when it doesn't.Risk
Low.
IMPORTANT: If this change touches code that ships in a NuGet package, please make certain that you have added any necessary package authoring and gotten it explicitly reviewed.