如何强制重新加载NLog配置文件? [英] How to force reload of NLog configuration file?

问题描述

我正在将NLog与配置文件一起使用. 为了避免在长时间的治疗中记录太多的东西，我正在做这种事情:

I'm using NLog with configuration files. To avoid to log too much things for some long treatments, I'm doing this kind of thing :

 foreach (LoggingRule rule in LogManager.Configuration.LoggingRules) 
 {
      rule.DisableLoggingForLevel(LogLevel.Trace);   
      rule.DisableLoggingForLevel(LogLevel.Debug);   
 }
 LogManager.ReconfigExistingLoggers();

它可以让我暂时降低日志记录的详细程度.上面的几行仅是一个示例. 这似乎工作得很好.

It allows me to temporarily degrade logging detail level. The lines above are just an example to illustrate. This seems to work perfectly.

在那之后，我想通过重新加载我的NLog.Config文件来恢复我的常规"日志记录配置，该文件已在程序启动时自动加载. 我已经尝试过了:

After that, I would like to restore my "regular" logging configuration, simply by reloading my NLog.Config file which was already automatically loaded at program startup. I've tried :

LogManager.Configuration.Reload();
LogManager.ReconfigExistingLoggers();

我认为这很容易，但是配置.Reload并没有达到我的预期，也没有找到其他合适的方法. 通话结束后，在程序启动时，我的记录器仍然不存储跟踪和调试事件.

I thought it would be easy but configuration.Reload doesn't do what I was expecting and I didn't find any other suitable method. After the call my logger still not store traces and debug events, while they were at program startup.

所以我的问题是:如何以编程方式在运行时强制重新加载NLog.config并恢复我的标准"记录器设置?

So my question is : how to programmatically force the reloading of NLog.config at runtime and restore my "standard" loggers settings ?

谢谢

具有更多详细信息的问题更新:

我使用的是VS2013，.Net 4 projet和NLog 4.4.0-beta11(测试版，但最后一次使用nuget)，在配置文件中定义了简单的文件"目标，并使用minLevel = Trace和autoReload = True

I'm using VS2013, .Net 4 projet with NLog 4.4.0-beta11 (beta but last on nuget), simple "File" target defined in configuration file with minLevel = Trace and autoReload=True

在类级别实例化的记录器: 私有静态只读Logger Logger = LogManager.GetCurrentClassLogger();

Logger instantiated at class level : private static readonly Logger Logger = LogManager.GetCurrentClassLogger();

这是我的测试证据:

    Assert.True(Logger.IsTraceEnabled);
    Assert.True(Logger.IsDebugEnabled);

    Logger.Trace("1 - This should appear in log");
    Logger.Debug("2 - This should appear in log");

    foreach (LoggingRule rule in LogManager.Configuration.LoggingRules)
    {
        rule.DisableLoggingForLevel(LogLevel.Trace);
        rule.DisableLoggingForLevel(LogLevel.Debug);
    }
    LogManager.ReconfigExistingLoggers();

    Logger.Trace("3 - This should NOT appear in log");
    Logger.Debug("4 - This should NOT appear in log");
    Logger.Info("5 - This should appear in log");

    Assert.False(Logger.IsDebugEnabled);
    Assert.False(Logger.IsTraceEnabled);

    LogManager.Configuration.Reload();
    LogManager.ReconfigExistingLoggers();

    // This is were something goes wrong

    Logger.Trace("6 - This should appear in log"); // DOES NOTHING
    Logger.Debug("7 - This should appear in log"); // DOES NOTHING
    Logger.Info("8 - This should appear in log");

    Assert.True(Logger.IsDebugEnabled); // FAILS
    Assert.True(Logger.IsTraceEnabled); // FAILS

生成的日志:

    TRACE 1 - This should appear in log         
    DEBUG 2 - This should appear in log
    INFO 5 - This should appear in log
    INFO 8 - This should appear in log

在nlog内部日志中，我可以看到配置似乎已被重新加载，没有问题(文件很长，因此除非有人询问，否则我不会将其发布在这里)，但是也许现有的记录器未更新?

In the nlog internal log I can see the configuration seems to have been reloaded with no problem (very long file so I don't post it here unless somebody asks), but maybe the existing loggers are not updated ?

使用上面的代码，应该很容易在您身边尝试.如果我做错了什么，或者是NLog配置管理中的错误，请告诉我.

With the code above it should be easy to try on your side. Please let me know if I do something wrong or if it's a bug inside NLog configuration management.

推荐答案

实际上，您的代码中有一个错误:LogManager.Configuration.Reload()不会更改记录器的配置，但是会从NLog.config加载配置文件，将其反序列化并返回LoggingConfiguration作为结果.

Actually, you've got an error in your code: LogManager.Configuration.Reload() does not change configuration of logger, but loads configuration from NLog.config file, deserializes it and returns LoggingConfiguration as a result.

要恢复配置，您需要执行以下操作:

to restore configuration, you need to do something like this:

LogManager.Configuration = LogManager.Configuration.Reload();
LogManager.ReconfigExistingLoggers();

这是一个测试示例(示例config中的minLevel ="DEBUG"):

here is a test example (minLevel in example config = "DEBUG"):

[TestMethod]
        public void Test()
        {
            Logger.Trace("TRACE 1");
            Logger.Debug("DEBUG 1");
            Logger.Warn("WARN 1");

            foreach (LoggingRule rule in LogManager.Configuration.LoggingRules)
            {
                rule.DisableLoggingForLevel(LogLevel.Trace);
                rule.DisableLoggingForLevel(LogLevel.Debug);
            }
            LogManager.ReconfigExistingLoggers();

            Logger.Trace("TRACE 2");
            Logger.Debug("DEBUG 2");
            Logger.Warn("WARN 2");

            // Reconfigure();
            LogManager.Configuration = LogManager.Configuration.Reload();
            LogManager.ReconfigExistingLoggers();

            Logger.Trace("TRACE 3");
            Logger.Debug("DEBUG 3");
            Logger.Warn("WARN 3");
        }

输出:

(DEBUG): DEBUG 1
(WARN): WARN 1
// here settings changed
(WARN): WARN 2
//here settings reloaded
(DEBUG): DEBUG 3
(WARN): WARN 3

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