Visual Basic® 2010 Unleashed

Defining Interfaces

An interface is a reference type which is defined within an Interface..End Interface block. Interfaces define only signatures for members that classes will then expose and are basically a set of the members’ definitions. Imagine you want to create an interface that defines members for working with documents. This is accomplished with the following code:

The interface is marked as Public because the default scope for interfaces is Friend. Assigning public visibility ensures external assemblies use the interface (which is a common scenario).

Interfaces Scope

Interfaces can be declared Private, Protected, or Protected Friend ...