Inheritance for COM apps in ProxyGen

There is a known issue with inheritance for COM apps in ProxyGen.  The events are not inherited by the interface returned to the add-in and casting won’t fix this.  The simple workaround is to add the missing inheritance to the proxy or to the descriptor file.

We have a tool AutoProxyGen which accepts add-ins.  A sample add-in included with this tool corrects this problem, just add lines to the add-in indicating which type needs to inherit which type.

Tools-to-Automate-VSTA-2-Integrations-AutoProxyGen-and-Templates

ShapeAppMFC:

AddImplements("ShapeApp.Proxy.IDrawing", "ShapeApp.Proxy._IDrawingEvents")

AddImplements("ShapeApp.Proxy.IShape", "ShapeApp.Proxy._IShapeEvents")

            Type to add inheritence to,   Type to inherit

ShapeAppMFC:

Original:

public partial class CDrawingDoc : global::System.MarshalByRefObject, global::ShapeApp.Proxy.IDrawing, global::ShapeApp.Proxy._IDrawingEvents{} //not returned to add-in

public partial interface IDrawing{} //type returned to add-in

Fixed: 

public partial class CDrawingDoc : global::System.MarshalByRefObject, global::ShapeApp.Proxy.IDrawing, global::ShapeApp.Proxy._IDrawingEvents{}

public partial interface IDrawing : global::ShapeApp.Proxy._IDrawingEvents{} //add inheritence to _IDrawingEvents to expose the events to the add-in