NLog.Targets.Target.Flush C# (CSharp) Method

        public void Flush(AsyncContinuation asyncContinuation)
        {
            if (asyncContinuation == null)
            {
                throw new ArgumentNullException("asyncContinuation");
            }

            lock (this.SyncRoot)
            {
                if (!this.IsInitialized)
                {
                    asyncContinuation(null);
                    return;
                }

                asyncContinuation = AsyncHelpers.PreventMultipleCalls(asyncContinuation);

                try
                {
                    this.FlushAsync(asyncContinuation);
                }
                catch (Exception exception)
                {
                    if (exception.MustBeRethrown())
                    {
                        throw;
                    }

                    asyncContinuation(exception);
                }
            }
        }