/// <summary>
/// Renders the specified Nested Diagnostics Context 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 override void Append(StringBuilder builder, LogEventInfo logEvent)
{
if (TopFrames == 1)
{
// Allows fast rendering of topframes=1
var topFrame = NestedDiagnosticsContext.PeekObject();
if (topFrame != null)
{
AppendAsString(topFrame, GetFormatProvider(logEvent), builder);
}
return;
}
var messages = NestedDiagnosticsContext.GetAllObjects();
if (messages.Length == 0)
{
return;
}
int startPos = 0;
int endPos = messages.Length;
if (TopFrames != -1)
{
endPos = Math.Min(TopFrames, messages.Length);
}
else if (BottomFrames != -1)
{
startPos = messages.Length - Math.Min(BottomFrames, messages.Length);
}
var formatProvider = GetFormatProvider(logEvent);
string currentSeparator = string.Empty;
for (int i = endPos - 1; i >= startPos; --i)
{
builder.Append(currentSeparator);
AppendAsString(messages[i], formatProvider, builder);
currentSeparator = Separator;
}
}