CODEWITHSUNDEEP
c#.net
user496949
user496949

Reputation: 86135

what does event inside the interface mean?

I know the class implementing an interface must implement all its method. But what does event inside the interface mean?

Upvotes: 2

Views: 602

Answers (2)

Jamiec
Jamiec

Reputation: 136124

It means anything implementing that interface must raise that event. Pretty much the same as a Method or Property within an interface.

Upvotes: 0

Jon Skeet
Jon Skeet

Reputation: 1501656

It means that the type must implement the event - so that clients can subscribe to those events.

Think of events as pairs of methods (add/remove) just as properties have get/set. Just as you can have properties in interfaces, you can have events: the implementation has to provide the appropriate add/remove methods and the metadata to tie them to the event. In C# this can be done using field-like events:

public event EventHandler EventFromInterface;

or with explicit add/remove methods:

public event EventHandler EventFromInterface
{
    add { ... }
    remove { ... }
}

Upvotes: 8

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