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.NET 5 removal of WinRT support does not correctly reject ComInterfaceType.InterfaceIsIInspectable #41621

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Scottj1s opened this issue Aug 31, 2020 · 1 comment · Fixed by #41633
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.NET 5 removal of WinRT support does not correctly reject ComInterfaceType.InterfaceIsIInspectable #41621

Scottj1s opened this issue Aug 31, 2020 · 1 comment · Fixed by #41633
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@jkoritzinsky
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area-Interop-coreclr
Milestone
5.0.0

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@Scottj1s
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Found when adding ComImport-based unit tests to C#/WinRT. An interface defined with ComInterfaceType.InterfaceIsIInspectable will cast without error, but subsequent interface calls will AV. According to @jkoritzinsky, the correct behavior is to throw an exception on the cast.

Repro:
unit test code
cast code, Marshal.GetObjectForIUnknown
@Dotnet-GitSync-Bot Dotnet-GitSync-Bot added the untriaged New issue has not been triaged by the area owner label Aug 31, 2020
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I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

@AaronRobinsonMSFT AaronRobinsonMSFT removed the untriaged New issue has not been triaged by the area owner label Aug 31, 2020
@AaronRobinsonMSFT AaronRobinsonMSFT added this to the 5.0.0 milestone Aug 31, 2020
@jkoritzinsky jkoritzinsky mentioned this issue Aug 31, 2020
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@jkoritzinsky jkoritzinsky

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area-Interop-coreclr
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Block casting to an interface marked ComInterfaceType.InterfaceIsIInspectable jkoritzinsky/runtime
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@jkoritzinsky @Scottj1s @AaronRobinsonMSFT @Dotnet-GitSync-Bot