public override RazorTemplateEngine Create(string projectPath, Action <IRazorEngineBuilder> configure) { if (projectPath == null) { throw new ArgumentNullException(nameof(projectPath)); } // In 15.5 we expect projectPath to be a directory, NOT the path to the csproj. var project = FindProject(projectPath); var configuration = (project?.Configuration as MvcExtensibilityConfiguration) ?? DefaultConfiguration; var razorLanguageVersion = configuration.LanguageVersion; var razorConfiguration = new RazorConfiguration(razorLanguageVersion, "unnamed", Array.Empty <RazorExtension>(), designTime: true); RazorEngine engine; if (razorLanguageVersion.Major == 1) { engine = RazorEngine.CreateCore(razorConfiguration, b => { configure?.Invoke(b); Mvc1_X.RazorExtensions.Register(b); if (configuration.MvcAssembly.Identity.Version.Minor >= 1) { Mvc1_X.RazorExtensions.RegisterViewComponentTagHelpers(b); } }); var templateEngine = new Mvc1_X.MvcRazorTemplateEngine(engine, RazorProject.Create(projectPath)); templateEngine.Options.ImportsFileName = "_ViewImports.cshtml"; return(templateEngine); } else { engine = RazorEngine.CreateCore(razorConfiguration, b => { configure?.Invoke(b); MvcLatest.RazorExtensions.Register(b); }); var templateEngine = new MvcLatest.MvcRazorTemplateEngine(engine, RazorProject.Create(projectPath)); templateEngine.Options.ImportsFileName = "_ViewImports.cshtml"; return(templateEngine); } }