public bool TryResolveContent(string fileName, IServiceProvider serviceProvider, out Stream stream, out IContentImporter contentImporter) { stream = null; contentImporter = null; if (!File.Exists(fileName)) { return(false); } stream = File.OpenRead(fileName); var importerFile = fileName + ".importer"; if (File.Exists(importerFile)) { contentImporter = xaml.Load <IContentImporter>(importerFile, serviceProvider); } else if (!importers.TryGetValue(Path.GetExtension(fileName), out contentImporter)) { throw new InvalidOperationException("Cannot find importer for file: " + fileName); } return(true); }