RemoveHtmlElementResponseFilter-Agility.cs

        public override void Flush()
        {
            var numArray = _internalStream.ToArray();

            if (numArray.Length == 0)
            {
                return;
            }

            if (HttpContext.Current?.Server.GetLastError() != null)
            {
                const string msg = Constants.NonEditingHtml.ExceptionMessage;

                Log.SingleWarn(msg, this);
                TransmitData(numArray);
            }
            else
            {
                var html = Encoding?.GetString(numArray) ?? string.Empty;
                var doc = new HtmlDocument();
                doc.LoadHtml(html);

                var nodes = new Queue<HtmlNode>(doc.DocumentNode.Descendants().Where(n => n.Attributes.Contains(Constants.NonEditingHtmlElementAttribute.DataExpOff)));
                while (nodes.Count > 0)
                {
                    var node = nodes.Dequeue();
                    var parentNode = node.ParentNode;
                    parentNode.RemoveChild(node);
                }

                var bytes = Encoding?.GetBytes(doc.DocumentNode.InnerHtml);

                if (bytes != null)
                {
                    TransmitData(bytes);
                }
                else
                {
                    throw new InvalidOperationException();
                }
            }
        }