Buffering log messages in NLog and manually flushes them to target

Question

I am trying to log via the NLog MailTarget. It works just fine, but i wanted to wrap the mailtarget with the BufferedTargetWrapper to buffer the log messages until a predefined codepoint, where i want to manually flush the buffer and send the previusly buffered log messages by an single mail (like defined in the mail target).

If I define a FlushTimeout or the BufferSize of the BufferedTargetWrapper everything still works just fine as supposed. But if the FlushTimeout and the BufferSize is not set, i can't get it to work.

Like answered in this question on SO Force BufferingTargetWrapper to empty i have no something like that:

 LogManager.Configuration.AllTargets.Where(t => t != null && t is BufferingTargetWrapper).ToList().
            ForEach(b => ((BufferingTargetWrapper)b).Flush(null));

But the documentation and this answer is contradictory to my NLog Version (2.0.0.2000). There is no flush method without parameters, only the flush method for asynchronous targets.

Is there a way to force the BufferingTargetWrapper to flush all the logged messages to the wrapped target (to send it by mail)?

Answer 1

According to the documentation your approach should not work, but it is fine. Just give the flush method an empty lambda expression:

LogManager.Configuration.AllTargets
    .OfType<BufferingTargetWrapper>()
    .ToList()
    .ForEach(b => b.Flush(e =>
        {
            //do nothing here
        }));