Add attributes for authoring support #2230
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Pull request overview
Adds new internal/implementation-detail attributes to support authored Windows Runtime component scenarios in WinRT.Runtime2, primarily for consumption by generated code (CsWinRT) and authoring/activation metadata.
Changes:
- Added
WindowsRuntimeAuthoringAssemblyAttributeto mark authored WinRT component assemblies that produce their own.winmd. - Added
WindowsRuntimeActivationFactoryAttributeto associate activation factory types with their authored runtime class types. - Added
WindowsRuntimeExclusiveToInterfaceAttributeto mark interfaces as exclusive to a projected runtime class type.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
src/WinRT.Runtime2/InteropServices/Attributes/WindowsRuntimeAuthoringAssemblyAttribute.cs |
New assembly-level attribute for authored WinRT components producing their own metadata. |
src/WinRT.Runtime2/InteropServices/Attributes/WindowsRuntimeActivationFactoryAttribute.cs |
New class-level attribute to link an activation factory to its runtime class type. |
src/WinRT.Runtime2/Attributes/WindowsRuntimeExclusiveToInterfaceAttribute.cs |
New interface-level attribute to indicate interface exclusivity to a projected runtime class type. |
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manodasanW
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Feb 10, 2026
src/WinRT.Runtime2/InteropServices/Attributes/WindowsRuntimeAuthoringAssemblyAttribute.cs
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Introduce WindowsRuntimeAuthoringAssemblyAttribute as a marker for assemblies that author Windows Runtime components (produce .winmd). The new sealed attribute (in WindowsRuntime.InteropServices) is marked [AttributeUsage(Assembly)], [EditorBrowsable(Never)] and [Obsolete] with CsWinRT diagnostic constants; it is intended to be emitted by the CsWinRT generator and not used directly. Includes an empty public constructor.
Introduce WindowsRuntimeExclusiveToInterfaceAttribute to annotate interfaces with their projected Windows Runtime class type. The sealed attribute targets interfaces, exposes a RuntimeClassType property set via constructor, and is marked Obsolete and EditorBrowsable(Never) to indicate it's for private implementation details and should not be used directly.
Rename the constructor parameter in WindowsRuntimeExclusiveToInterfaceAttribute from "interfaceType" to "runtimeClassType" and update the assignment to clarify that it represents the projected Windows Runtime class type. Add a new WindowsRuntimeActivationFactoryAttribute (src/WinRT.Runtime2/InteropServices/Attributes/WindowsRuntimeActivationFactoryAttribute.cs) to annotate the authored Windows Runtime class type for activation factories; the attribute is marked Obsolete (private implementation detail diagnostics) and EditorBrowsable(Never).
Sergio0694
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Rename WindowsRuntimeAuthoringAssemblyAttribute to WindowsRuntimeComponentAssemblyAttribute: file renamed and class, constructor, and XML doc updated to reflect the new name. No behavioral changes; this aligns the API/type name with component assembly semantics.
manodasanW
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Feb 10, 2026
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Title.