[release/5.0] Use reflection-only context for InternalsVisibleToAttribute type comparison #4939
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Description
Backport fix from 6.0 to 5.0: Compilation error MC3064 when importing internal user control from signed class library.
Customer Impact
Internal types contained in assemblies with InternalsVisibleTo attributes that are referenced in markup cause a markup compiler error: error MC3064: Only public or internal classes can be used within markup. 'InternalClass' type is not public or internal.
Regression
This is a regression from .NET Framework.
Risk
Very low. This code is only exercised when WPF applications are compiled. This is a single-line change that has been in .NET 6.0 since February.
Testing
Repro'd the issue on release/5.0 when importing an internal user control from signed class library:
error MC3064: Only public or internal classes can be used within markup.
After applying the fix and rebuilding the WindowsDesktop SDK, referencing internal types in markup that are contained in an assembly with InternalsVisibleTo (which grants access to the target assembly) now works as expected when targeting .NET 5.0.