private async Task FlushTrailBytesAsync()
{
if (_attributeValue != null)
WriteAttributeText(XmlConverter.Base64Encoding.GetString(_trailBytes, 0, _trailByteCount));
if (!_isXmlnsAttribute)
{
await StartContentAsync().ConfigureAwait(false);
await _writer.WriteBase64TextAsync(_trailBytes, _trailByteCount, _trailBytes, 0, 0).ConfigureAwait(false);
EndContent();
}
_trailByteCount = 0;
}