private string BuilderHeaderOutput()
{
StringBuilder sb = new StringBuilder();
_parent.RenderHeader(sb);
return(sb.ToString());
}
/// <summary>
/// Renders the layout for the specified logging event by invoking layout renderers.
/// </summary>
/// <param name="logEvent">The logging event.</param>
/// <param name="target"><see cref="StringBuilder"/> for the result</param>
protected override void RenderFormattedMessage(LogEventInfo logEvent, StringBuilder target)
{
_parent.RenderHeader(target);
}