System.Xml.XmlBufferReader.GetAmpersandCharEntity C# (CSharp) Метод

        private int GetAmpersandCharEntity(int offset, int length)
        {
            byte[] buffer = _buffer;
            if (length != 5 ||
                buffer[offset + 1] != (byte)'a' ||
                buffer[offset + 2] != (byte)'m' ||
                buffer[offset + 3] != (byte)'p')
            {
                XmlExceptionHelper.ThrowInvalidCharRef(_reader);
            }
            return (int)'&';
        }