显式重新加载配置后 NLog 不写入文件

Question

它基本上是的副本，我知道，但即使在遵循了另一个 post 和故障排除指南之后，我仍然卡住了。

这是一个使用 NLog 4.7.10 的 .net 标准 2.0 库，没有配置文件，执行以下操作：

internal Log()
{
    NLog.Common.InternalLogger.LogLevel = LogLevel.Trace;
    NLog.Common.InternalLogger.LogToConsole = true;
    NLog.Common.InternalLogger.LogFile = "nlog-internal.txt";

    LogManager.Configuration = new NLog.Config.LoggingConfiguration();
    LogManager.ThrowExceptions = true;

    this.Core = this.CustomLog("core");
    this.Core.Info("Done!");
}

public Logger CustomLog(string name)
{
    if (name == null)
        throw new ArgumentNullException(name);

    if (LogManager.Configuration.FindRuleByName(name) == null)
    {
        FileTarget target = new FileTarget(name)
        {
            FileName = string.Format("{0}.txt", name),
            Layout = DefaultLayout,
            AutoFlush = true,
            DeleteOldFileOnStartup = true
        };

        LogManager.Configuration.AddTarget(target);
        LogManager.Configuration.AddRule(LogLevel.Trace, LogLevel.Fatal, target, name);
        LogManager.Configuration.Reload();
    }

    return LogManager.GetLogger(name);
}

然后将所有内容导入 net core 3.1 应用程序

我得到的是：写了nlog-internal.txt，控制台显示相同的信息

2021-07-01 13:09:28.6727 Debug --- NLog configuration dump ---
2021-07-01 13:09:28.6727 Debug Targets:
2021-07-01 13:09:28.6727 Debug Rules:
2021-07-01 13:09:28.6727 Debug --- End of NLog configuration dump ---
2021-07-01 13:09:28.6924 Trace FindReachableObject<System.Object>:
2021-07-01 13:09:28.6924 Info Validating config: Targets=0, ConfigItems=0
2021-07-01 13:09:28.7186 Debug ScanAssembly('NLog, Version=4.0.0.0, Culture=neutral, PublicKeyToken=5120e14c03d0593c')
2021-07-01 13:09:28.7602 Debug Found assembly location directory: 'D:\Work\netcoreapp3.1' (NLog, Version=4.0.0.0, Culture=neutral, PublicKeyToken=5120e14c03d0593c)
2021-07-01 13:09:28.7602 Debug Auto loading based on NLog-Assembly found location: D:\Work\netcoreapp3.1
2021-07-01 13:09:28.7602 Debug Search for auto loading files in location: D:\Work\netcoreapp3.1
2021-07-01 13:09:28.7694 Debug Found assembly location directory: 'D:\Work\netcoreapp3.1' (BrokenGalaxy, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null)
2021-07-01 13:09:28.7694 Debug Auto loading based on GetEntryAssembly-Assembly found location: D:\Work\netcoreapp3.1
2021-07-01 13:09:28.7694 Debug Auto loading based on AppDomain-BaseDirectory found location: D:\Work\netcoreapp3.1
2021-07-01 13:09:28.7694 Debug Start auto loading, location: D:\Work\netcoreapp3.1
2021-07-01 13:09:28.7694 Debug Auto loading done
2021-07-01 13:09:28.7694 Trace FindReachableObject<NLog.Internal.IRenderable>:
2021-07-01 13:09:28.7849 Trace Scanning LongDateLayoutRenderer 'Layout Renderer: ${longdate}'
2021-07-01 13:09:28.7849 Debug Setting 'NLog.LayoutRenderers.Wrappers.UppercaseLayoutRendererWrapper.uppercase' to 'true'
2021-07-01 13:09:28.7849 Trace Wrapping NLog.LayoutRenderers.LevelLayoutRenderer with NLog.LayoutRenderers.Wrappers.UppercaseLayoutRendererWrapper
2021-07-01 13:09:28.7849 Trace FindReachableObject<NLog.Internal.IRenderable>:
2021-07-01 13:09:28.7849 Trace Scanning LevelLayoutRenderer 'Layout Renderer: ${level}'
2021-07-01 13:09:28.7978 Trace FindReachableObject<NLog.Internal.IRenderable>:
2021-07-01 13:09:28.7978 Trace Scanning UppercaseLayoutRendererWrapper 'Layout Renderer: ${uppercase}'
2021-07-01 13:09:28.7978 Trace  Scanning Property Inner 'SimpleLayout=Layout Renderer: ${level}' NLog.Layouts
2021-07-01 13:09:28.7978 Trace  Scanning SimpleLayout 'SimpleLayout=Layout Renderer: ${level}'
2021-07-01 13:09:28.7978 Trace   Scanning Property Renderers 'System.Collections.ObjectModel.ReadOnlyCollection`1[NLog.LayoutRenderers.LayoutRenderer]' System.Collections.ObjectModel
2021-07-01 13:09:28.7978 Trace   Scanning LevelLayoutRenderer 'Layout Renderer: ${level}'
2021-07-01 13:09:28.7978 Trace FindReachableObject<NLog.Internal.IRenderable>:
2021-07-01 13:09:28.7978 Trace Scanning LoggerNameLayoutRenderer 'Layout Renderer: ${logger}'
2021-07-01 13:09:28.7978 Trace FindReachableObject<NLog.Internal.IRenderable>:
2021-07-01 13:09:28.7978 Trace Scanning MessageLayoutRenderer 'Layout Renderer: ${message}'
2021-07-01 13:09:28.8196 Debug Setting 'NLog.LayoutRenderers.DateLayoutRenderer.format' to 'HH:mm:ss.fff'
2021-07-01 13:09:28.8196 Trace FindReachableObject<NLog.Internal.IRenderable>:
2021-07-01 13:09:28.8196 Trace Scanning DateLayoutRenderer 'Layout Renderer: ${date}'
2021-07-01 13:09:28.8196 Trace FindReachableObject<NLog.Internal.IRenderable>:
2021-07-01 13:09:28.8196 Trace Scanning LevelLayoutRenderer 'Layout Renderer: ${level}'
2021-07-01 13:09:28.8196 Trace FindReachableObject<NLog.Internal.IRenderable>:
2021-07-01 13:09:28.8196 Trace Scanning MessageLayoutRenderer 'Layout Renderer: ${message}'
2021-07-01 13:09:28.8196 Debug Registered target core: NLog.Targets.FileTarget
2021-07-01 13:09:28.8362 Debug Targets for core by level:
2021-07-01 13:09:28.8362 Debug Trace => core
2021-07-01 13:09:28.8362 Debug Debug => core
2021-07-01 13:09:28.8362 Debug Info => core
2021-07-01 13:09:28.8362 Debug Warn => core
2021-07-01 13:09:28.8362 Debug Error => core
2021-07-01 13:09:28.8362 Debug Fatal => core
2021-07-01 13:09:30.9517 Info AppDomain Shutting down. Logger closing...
2021-07-01 13:09:30.9592 Trace Flushing all 1 targets...
2021-07-01 13:09:30.9592 Trace ForEachItemInParallel() 1 items
2021-07-01 13:09:30.9592 Trace Continuation invoked: 
2021-07-01 13:09:30.9592 Trace Parallel task completed. 0 items remaining
2021-07-01 13:09:30.9694 Debug Flush completed
2021-07-01 13:09:30.9694 Debug Targets not configured for logger: core
2021-07-01 13:09:30.9694 Debug Closing logging configuration...
2021-07-01 13:09:30.9694 Debug Finished closing logging configuration.
2021-07-01 13:09:30.9694 Info Logger has been shut down.

我期望的是： 也有一个带有“完成！”的 core.txt 文件。它里面的线。我也试过在 FileName 的字符串格式中使用“${{basedir}}{0}.txt”，但没有用。

没有错误，也没有异常。此外，如果我尝试通过配置文件配置 NLog，它会起作用，所以我也会排除权限问题。

可能是 Debug Targets not configured for logger: core 接近日志文件的末尾，但我在其他项目中也这样做过，并且它正在运行..

我错过了什么？有什么想法吗？

Answer 1

这就是您正在寻找的方法：

LogManager.ReconfigExistingLoggers();

它将刷新所有现有的 Logger 对象，因此它们将识别您对 LoggingRules 所做的更改。

你不应该使用这个方法，因为它没有达到你的预期：

LogManager.Configuration.Reload();

如果您使用 XmlLoggingConfiguration 从 NLog.config 文件加载配置，它只会做一些有用的事情。它将再次从文件中重新读取整个配置，并 return 结果（但不会应用它）。 Reload() 方法应该受到保护，而不是 public API 的一部分（因为它是混淆的来源）。

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