NLog.Config.LoggingConfiguration.FlushAllTargets C# (CSharp) Method

        internal void FlushAllTargets(AsyncContinuation asyncContinuation)
        {
            var uniqueTargets = new List<Target>();
            foreach (var rule in this.LoggingRules)
            {
                foreach (var t in rule.Targets)
                {
                    if (!uniqueTargets.Contains(t))
                    {
                        uniqueTargets.Add(t);
                    }
                }
            }

            AsyncHelpers.ForEachItemInParallel(uniqueTargets, asyncContinuation, (target, cont) => target.Flush(cont));
        }