/// <summary>
/// Renders the specified NDC item and appends it to the specified <see cref="StringBuilder" />.
/// </summary>
/// <param name="builder">The <see cref="StringBuilder"/> to append the rendered data to.</param>
/// <param name="logEvent">Logging event.</param>
protected internal override void Append(StringBuilder builder, LogEventInfo logEvent)
{
string msg;
if (TopFrames != -1)
{
msg = NDC.GetTopMessages(TopFrames, Separator);
}
else if (BottomFrames != -1)
{
msg = NDC.GetBottomMessages(BottomFrames, Separator);
}
else
{
msg = NDC.GetAllMessages(Separator);
}
builder.Append(ApplyPadding(msg));
}