public RazorDocumentManager([ImportMany]params IRazorDocumentSource[] documentSources)
{
_documentSources = (documentSources ?? Enumerable.Empty<IRazorDocumentSource>());
// Always add the plain Razor Template file source at the end of the list
_documentSources = _documentSources.Union(new [] { new RazorTemplateFileSource() });
Encoding = Encoding.UTF8;
}