将目标设置为异步时，NLog不会刷新缓冲的日志

Question

我当前正在修改NLog配置，并尝试将目标设置为异步并使用BufferingTarget进行邮件处理时，我发现Nlog似乎并没有在应用程序关闭时刷新邮件。

调用LogManager.Flush();也不起作用，它给出了NLog.NLogRuntimeException：

NLog.dll中发生了类型为'NLog.NLogRuntimeException'的第一次机会异常。其他信息：发生了异步异常。

我发现async="true"从targets配置中删除即可。以下是我用来进行测试的配置和控制台源代码。

我看到有很多与日志序列和/或FallbackTarget相关的帖子，但是它们对解决我目前遇到的问题没有太大帮助。

控制台应用

class Program
{
    static void Main(string[] args)
    {
        Logger logger = LogManager.GetCurrentClassLogger();

        logger.Debug("Debug Message");
        logger.Debug("Debug Message");

        LogManager.Flush();
        LogManager.Shutdown();
    }
}

Nlog配置

class Program
{
    static void Main(string[] args)
    {
        Logger logger = LogManager.GetCurrentClassLogger();

        logger.Debug("Debug Message");
        logger.Debug("Debug Message");

        LogManager.Flush();
        LogManager.Shutdown();
    }
}

异常堆栈跟踪

at NLog.Common.AsyncHelpers.RunSynchronously(AsynchronousAction action)
   at NLog.LogFactory.Flush(TimeSpan timeout)
   at NLog.LogFactory.Flush()
   at NLog.LogManager.Flush()
   at MyProject.NlogTests.Program.Main(String[] args) in p:...\Program.cs:line 15

Nlog日志文件（简体）

2016-12-09 17:29:55.0471 Trace Opening \bin\Dev\\Logs\Info.log with allowFileSharedWriting=False
2016-12-09 17:29:55.5354 Trace LogFactory.Flush(00:00:15)
2016-12-09 17:29:55.5354 Trace Flushing all targets...
2016-12-09 17:29:55.5354 Trace ForEachItemInParallel() 3 items
2016-12-09 17:29:55.5819 Trace Flushing 1 events.
2016-12-09 17:29:55.6119 Trace Opening \bin\Dev\\Logs\Info.log with allowFileSharedWriting=False
2016-12-09 17:29:55.6209 Trace Continuation invoked: 
2016-12-09 17:29:55.6209 Trace Parallel task completed. 2 items remaining
2016-12-09 17:29:55.6825 Trace Flushing 0 events.
2016-12-09 17:29:55.6825 Trace Continuation invoked: 
2016-12-09 17:29:55.6825 Trace Parallel task completed. 1 items remaining
2016-12-09 17:30:16.7442 Trace LogFactory.Flush(00:00:15)
2016-12-09 17:30:16.7442 Trace Flushing all targets...
2016-12-09 17:30:16.7702 Trace ForEachItemInParallel() 3 items
2016-12-09 17:30:16.8032 Trace Flushing 0 events.
2016-12-09 17:30:16.8032 Trace Flushing 0 events.
2016-12-09 17:30:16.8032 Trace Continuation invoked: 
2016-12-09 17:30:16.8032 Trace Parallel task completed. 2 items remaining
2016-12-09 17:30:16.8032 Trace Continuation invoked: 
2016-12-09 17:30:16.8032 Trace Continuation invoked: 
2016-12-09 17:30:16.8167 Trace Parallel task completed. 1 items remaining
2016-12-09 17:30:16.8167 Trace Parallel task completed. 0 items remaining
2016-12-09 17:30:16.8167 Info Shutting down logging...
2016-12-09 17:30:16.8167 Info Closing old configuration.
2016-12-09 17:30:16.8167 Trace LogFactory.Flush(00:00:15)
2016-12-09 17:30:16.8167 Trace Flushing all targets...
2016-12-09 17:30:16.8167 Trace ForEachItemInParallel() 3 items
2016-12-09 17:30:16.8457 Trace   Using basic authentication: Username='########@########.com' Password='********'
2016-12-09 17:30:16.8472 Debug Sending mail to ########@########.com using smtp.gmail.com:587 (ssl=True)
2016-12-09 17:30:16.8472 Trace   Subject: 'Service: ####### | ######### | Info'
2016-12-09 17:30:16.8472 Trace   From: '########@########.com'

Answer 1

NLog版本。4.4.1 现在尝试立即处理手动刷新，而不是等待 BufferingWrapper 的flushTimeout =“50000”。