Headless.InvalidHtmlElementException.BuildSupportedTagsMessage C# (CSharp) 메소드

        private static string BuildSupportedTagsMessage(IXPathNavigable node, IEnumerable<SupportedTagAttribute> tags)
        {
            var supportedTags = tags.Select(x => x.ToString()).Aggregate((i, j) => i + Environment.NewLine + j);

            var navigator = node.GetNavigator();

            var message = string.Format(
                CultureInfo.CurrentCulture,
                "The specified '{0}' element is invalid. The supported tags for this node are: {1}",
                navigator.Name,
                supportedTags);

            return message;
        }