public RteEmbedController(EmbedProvidersCollection embedCollection, ILogger <RteEmbedController> logger)
 {
     _embedCollection = embedCollection ?? throw new ArgumentNullException(nameof(embedCollection));
     _logger          = logger ?? throw new ArgumentNullException(nameof(logger));
 }
 public RteEmbedController(EmbedProvidersCollection embedCollection)
 {
     _embedCollection = embedCollection ?? throw new ArgumentNullException(nameof(embedCollection));
 }