给定一个具有以下接口(interface)的基类:publicclassBase{publicvirtualIEnumerableGetListOfStuff(){yieldreturn"First";yieldreturn"Second";yieldreturn"Third";}}我想创建一个重写方法的派生类，并添加自己的东西，如下所示:publicclassDerived:Base{publicoverrideIEnumerableGetListOfStuff(){foreach(stringsinbase.GetListOfStuff()){yieldreturns;}yield