Helper for Filter Attribute to change OnResultExecuted

MemoryStreamHelper

 public class MemoryStreamHelper: MemoryStream
    {
        private readonly Stream _responseStream;
        private readonly Dictionary<string, string> _stringReplacementDictionary;

        public MemoryStreamHelper(Stream responseStream, Dictionary<string, string> stringReplacementDictionary)
        {
            _responseStream = responseStream;
            _stringReplacementDictionary = stringReplacementDictionary;
        }

        public override void Write(byte[] buffer, int offset, int count)
        {
            string html = Encoding.UTF8.GetString(buffer);

            //replace values in html
            html = _stringReplacementDictionary.Aggregate(html, (current, item) => Regex.Replace(current, item.Key + "(?!\" class=\"language)", item.Value));

            buffer = Encoding.UTF8.GetBytes(html);

            _responseStream.Write(buffer, offset, buffer.Length);
        }
    }