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Custom marshallers require additional members

  • Статия

The custom marshaller analyzer has changed to require all element-focused marshal modes to satisfy both the managed-to-unmanaged and unmanaged-to-managed shapes.

Previous behavior

Custom marshallers with MarshalMode.ElementIn only needed a ConvertToUnmanaged method. Custom marshallers with MarshalMode.ElementOut only needed a ConvertToManaged method.

New behavior

Starting in .NET 8, SYSLIB1057 is reported for custom marshallers with MarshalMode.ElementIn or MarshalMode.ElementOut that don't have both a ConvertToUnmanaged and ConvertToManaged method.

Version introduced

.NET 8 RC 1

Type of breaking change

This change can affect source compatibility.

Reason for change

With the introduction of source-generated COM, the marshallers can be used in element scenarios in both managed-to-unmanaged and unmanaged-to-managed scenarios. This change updates the analyzer to ensure that user-defined marshallers have the required members for all scenarios where the marshaller might be used.

Add both a ConvertToManaged and ConvertToUnmanaged method to the marshaller type.

Affected APIs