Why can't I put a delegate in an interface?

Question

Why can\'t I add a delegate to my interface?

Answer 1

The documentation clearly says that you can define a delegate in an interface:

An interface contains only the signatures of methods, delegates or events.

MSDN: interface (C# Reference)

However, in the remarks on the same page it says that an interface can contain signatures of methods, properties, indexers and events.

If you try to put a delegate in an interface, the compiler says that "interfaces cannot declare types."

The Ecma-334 standard (8.9 Interfaces) agrees with the remarks on that page and the compiler.