Question

It is possible, given only an interface, to create an object from this?

Something like:

var obj = new IWidget();

(I know this code isn’t right – VS stays cannot create an instance of IWidget)

I’m in a context where my project has references to the interfaces, and I want to create concrete objects and return them from a method – but I can’t figure out how to create the objects purely from the interfaces.

Answer 1

You can’t create an object from an interface. You can create an object from a class that uses that interface.

For example:

IList<string> x = new IList<string>();

will not work.

IList<string> x = new List<string>();

will.

Interfaces cannot be created, only objects that use the interface can be created.