I want to have a generic breadcrumb on my forum so have been writing a method to put it together. I have hit a stumbling block however in that when on a topic I cannot retrieve the topic to add to the breadcrumb.

This is the code I have so far

[ChildActionOnly]
    public PartialViewResult GetBreadcrumb()

        var viewModel = new BreadCrumbViewModel();

        if (AppHelpers.CurrentPage().DocumentTypeAlias == AppConstants.DocTypeForumCategory)
        {
            var category = ServiceFactory.CategoryService.Get(CurrentPage.Id, true);

            viewModel.Categories = category.ParentCategories;
            viewModel.Category = category;
        }

        // how do I check this is a topic and retrieve it to add to the model

        return PartialView(PathHelper.GetThemePartialViewPath("GetBreadcrumb"), viewModel);
    }

Retriving the category is simple enough as those pages exist in umbraco however how to I retrieve the topic as it's a virtual page. Can anyone advise?

Thanks