Diagnostics reference

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Compiler messages below are defined in DiagnosticDescriptors.cs in the generator repository. R3SG IDs are authoritative; this table is for navigation.

Errors

ID	Title	When
R3SG0001	Containing type must be partial	The type must be declared partial for [R3Command] source generation
R3SG1001	Unsupported command method signature	Method signature is not in the R3Command matrix
R3SG1002	CanExecute member not found	CanExecute name does not exist on the partial type
R3SG1003	CanExecute member type mismatch	CanExecute must be R3.Observable<bool> or IObservable<bool>
R3SG1004	Duplicate command property name	Two methods would emit the same command property; use distinct CommandName

Warnings

ID	Title	When
R3SG2001	Unsupported event delegate	Event delegate is not supported for observable generation (FromEvents)
R3SG2002	FromEventHandlers delegate shape	Event is unsupported for FromEventHandlers (needs EventHandler, EventHandler<T>, or legacy (object, T) void delegate)

Message formats (compiler)

ID	messageFormat
R3SG0001	The type '{0}' must be declared partial for source generation.
R3SG1001	The method '{0}' signature is not supported by [R3Command].
R3SG1002	The CanExecute member '{0}' was not found on type '{1}' for method '{2}'.
R3SG1003	The CanExecute member '{0}' on type '{1}' must be R3.Observable<bool> or System.IObservable<bool>, but has type '{2}'.
R3SG1004	The command property '{0}' would be generated for both '{1}' and '{2}' on type '{3}'. Use distinct CommandName values.
R3SG2001	The event '{0}' has an unsupported delegate signature for observable generation.
R3SG2002	The event '{0}' is unsupported for FromEventHandlers (needs System.EventHandler, System.EventHandler<T>, or void delegate with (object, T) parameters).

Category: MvvmAIO.R3.SourceGenerators