Inheriting from generic WeakEventManager creates error -

i want make weakeventcollectionweaver bind multiple observablecollections together.

i inherit this:

public class weakeventcollectionweaver<t> :    weakeventmanager<observablecollection<t>,    notifycollectionchangedeventargs> { }

but error:

cs1729 weakeventmanager<observablecollection<t>, notifycollectionchangedeventargs> not contain constructor takes 0 arguments

i looked , believe not have implement constructor. why error there?

it not possible inherit class. has private constructor (hence no default constructor), descendant classes cannot call it.

take @ source of class here:

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