C# Language Specification

Interface events

Interface events are declared using interface-event-declarations:

interface-event-declaration:
attributes_opt new_opt event type identifier ;

The attributes, type, and identifier of an interface event declaration have the same meaning as those of an event declaration in a class (§10.8).

The type of an interface event must be input-safe.

4. Interface indexers

Interface indexers are declared using interface-indexer-declarations:

interface-indexer-declaration:
attributes_opt new_opt type this [ formal-parameter-list ] { interface-accessors }

The attributes, type, and formal-parameter-list of an interface indexer declaration have the same meaning as those of an indexer declaration in a class (§10.9).

The accessors of an interface indexer declaration correspond to the accessors of a class indexer declaration (§10.9), except that the accessor body must always be a semicolon. Thus, the accessors simply indicate whether the indexer is read-write, read-only, or write-only.

All the formal parameter types of an interface indexer must be input-safe . In addition, any out or ref formal parameter types must also be output-safe. Note that even out parameters are required to be input-safe, due to a limitiation of the underlying execution platform.

The type of an interface indexer must be output-safe if there is a get accessor, and must be input-safe if there is a set accessor.

5.