We need to render an ActionResult to a string to add pages to our internal search engine index. We settled on this solution to render to string.

I've run into a problem with the ExecuteResult call used to process the View.

Code Snippet:

var oldController = controllerContext.RouteData.Values["controller"];
controllerContext.RouteData.Values["controller"] = 
                  typeof(TController).Name.Replace("Controller", "");

viewResult.ExecuteResult(controllerContext); // this line breaks

I receive the following error:

"Object reference not set to instance of object" error.

I've confirmed viewResult is not null, so the exception has to be thrown internally in ExecuteResult.

What could we be missing?