在.NET Core 3中使用NLog管理日志记录配置

问题描述

我在.NET Core 3.1辅助服务应用程序中使用NLog.在NLog教程之后，我插入了一个nlog.config文件来管理配置.

I'm using NLog in a .NET Core 3.1 worker service application.Following the tutorial of NLog I inserted an nlog.config file to manage the configuration.

现在我很困惑，因为我在配置日志记录的三个方面:

Now I'm confused because I have three points where I configure the logging:

1. In the code where I need to create a logger in a dependency injection
context

// Other code...

services.AddScoped<IApplyJcdsCommandsJob, ApplyJcdsCommandsJob>(provider =>
{
    var loggerFactory = LoggerFactory.Create(builder =>
    {
        builder
            .ClearProviders()
            .AddFilter("Microsoft", Microsoft.Extensions.Logging.LogLevel.Trace)
            .AddFilter("System", Microsoft.Extensions.Logging.LogLevel.Trace)
            .AddFilter("ApplyJcdsCommandsJob", Microsoft.Extensions.Logging.LogLevel.Trace)
            //.AddConsole()
            //.AddEventLog();
            .AddNLog(configuration);
    });

    Microsoft.Extensions.Logging.ILogger logger = loggerFactory.CreateLogger<CommandsJob>();

    return new CommandsJob(logger);
})

// Other code...

2. In appSettings.json

  {
     "Logging": {
     "IncludeScopes": false,
     "LogLevel": {
     "Default": "Trace",
     "System": "Trace",
     "Microsoft": "Trace"
    }
  }
}

3. in NLog.config

The default config file produced by the nuget package installation:

<!-- a section of the config -->
<targets>
    <target xsi:type="File" name="f"
fileName="${basedir}/logs/${shortdate}.log"
        layout="${longdate} ${uppercase:${level}} ${message}" />
</targets>

<rules>
    <logger name="*" minlevel="Trace" writeTo="f" />
</rules>
<!-- ... -->

我看到的是，如果删除Nlog.config文件，将不会创建日志文件.其他更改接缝无效.

What I see is that if I remove the Nlog.config file, the log file will not be created.Other changes seam to have no effect.

此配置如何关联?开启/关闭日志记录并设置级别的最佳方法是什么?

How are this configurations related?What is the best way to switch on/off the logging and set the level?

推荐答案

决定使用NLog的人们通常还希望禁用所有MEL过滤，以避免与两个过滤系统混淆.因此， NLog Wiki-教程是针对这些用户的.

People that decide to use NLog usually also want to disable all MEL-filtering to avoid the confusion with two filtering systems. So the NLog wiki-tutorial is targeted those users.

我想首先是MEL用户的人可能只会使用new HostBuilder().CreateDefaultBuilder().Build()(将在启用所有枪支的情况下设置所有内容).

I guess people who are MEL-users first will probably just use new HostBuilder().CreateDefaultBuilder().Build() (Will setup everything with all guns enabled).

但是如果只考虑简单的示例，则需要删除:

But if staying with the simple example, then you need to remove:

loggingBuilder.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);

并添加:

loggingBuilder.AddConfiguration(config.GetSection("Logging"));

所以看起来像这样:

serviceCollection.AddLogging(loggingBuilder =>
{
   loggingBuilder.ClearProviders();
   loggingBuilder.AddConfiguration(config.GetSection("Logging"));
   loggingBuilder.AddNLog(config);
})

可以在Nuget上找到

ILoggingBuilder.AddConfiguration: Microsoft.Extensions.Logging .配置

ILoggingBuilder.AddConfiguration can be found at Nuget: Microsoft.Extensions.Logging.Configuration

这篇关于在.NET Core 3中使用NLog管理日志记录配置的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！