[release/7.0] Fix TransactionInterop.GetDtcTransaction() #74821
Merged
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Backport of #74776 to release/7.0
/cc @roji
Customer Impact
The TransactionInterop.GetDtcTransaction() method, which is part of the Windows-only distributed transaction support introduced for .NET 7.0, does not work.
Testing
Coverage added in the PR.
Risk
Very low. The change is part of a feature only introduced in .NET 7.0; the function in question threw PlatformNotSupportedException previously. The fix is a simple correction of the COM interop definition which the function implementation uses.
/cc @AaronRobinsonMSFT @ajcvickers