包裹类型参数？

Question

如果我有一个C＃类：

public class MyFactory<TWidget, TGadget, TGizmo, TThing> 
    where TWidget: IWidget
    where TGadget: IGadget
    where TGizmo: IGizmo
    where TThing: IThing, new()
    {
      public TThing CreateThing(ThingModel model) {
        // create Thing here
      }
    }

有没有办法将这些类型打包成更短的东西？换句话说，就像这样：

ThingModel model = this.ThingModel;
TTypeList typeList = this.TypeList; // the list wraps TNativeWidget, TNativeGadget, TNativeGizmo, and TNativeThing
MyFactory<TTypeList> factory = new Factory(typeList);
TNativeThing thing = factory.CreateThing(model);