c# - How do I create Optional Type injection for a base class? -

during course of regular agile programming technique, lot of refactoring. if find common things candidates base class. assume code pattern:

public subclass : baseclass{    private dynamic somevalue = null;    public subclass(){        somevalue = baseclass.method<t>();    } } 

everything works fine until tired of continually injecting type method. why not inject type base class instead? wait second, don't want have redo 20 classes using pattern above. have 2 potential patterns can use, being second.

public subclass : baseclass<t>{    private t somevalue = null;    public subclass(){        somevalue = baseclass.method();    } } 

this second pattern logical derivation of first example whereby merely moving type class ctor instead of using generic type in each method.

i ask community thoughts on how accomplish both constructs without changing current code adding in support of generic type baseclass pattern.

i have read other posts on "optional generic class types" of closed stackoverflow nazi soup police.

once again gang of 4 right "favor composition on inheritance". in case maybe term baseclass not appropriate, can see how our baseclass concept wrong @ beginning not asking "is baseclass?"

public subclass {    private baseclass bc1 = null;    private baseclass<sometype> bc2 = null;    private dynamic somevalue = null;    public subclass(){      //i still have base class operation ability, now...      bc2 = new baseclass<sometype>();      somevalue = bc2.method();  } 

}