c# - ILogger 未将 TRACE 和 DEBUG 消息写入目标

Question

我正在我们的 ASP.NET Core 3 应用程序中设置一些日志记录，使用 ILogger (Microsoft.Extensions.Logging) 和 NLog 来启用写入文本文件。

问题是，ILogger 不写入跟踪和调试级别的消息。文本文件或 Visual Studio 输出窗口。使用 NLog.Logger 适用于所有级别。这个问题也存在于默认的 ASP.NET Core 3 Web API 应用程序中，从他们的官方教程中设置了 NLog。以下是我拥有的相关代码。

程序.cs

public static void Main(string[] args)
{
    var logger = NLog.Web.NLogBuilder.ConfigureNLog("nlog.config").GetCurrentClassLogger();
    try
    {
        logger.Trace("NLog Trace from Main()");
        logger.Debug("NLog Debug from Main()");
        logger.Info("NLog Info from Main()");
        logger.Warn("NLog Warn from Main()");
        logger.Error("NLog Error from Main()");
        logger.Fatal("NLog Fatal from Main()");
        CreateHostBuilder(args).Build().Run();
    }
    catch (Exception exception)
    {
        //NLog: catch setup errors
        logger.Error(exception, "Stopped program because of exception");
        throw;
    }
    finally
    {
        // Ensure to flush and stop internal timers/threads before application-exit (Avoid segmentation fault on Linux)
        NLog.LogManager.Shutdown();
    }
}

public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
        .ConfigureWebHostDefaults(webBuilder =>
        {
            webBuilder.UseStartup<Startup>();
        })
        .ConfigureLogging(options =>
        {
            options.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);
        }).UseNLog();

nlog.config

<?xml version="1.0" encoding="utf-8" ?>
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      autoReload="true"
      internalLogLevel="Info"
      internalLogFile="c:\temp\internal-nlog.txt">

  <!-- enable asp.net core layout renderers -->
  <extensions>
    <add assembly="NLog.Web.AspNetCore"/>
  </extensions>

  <!-- the targets to write to -->
  <targets>
    <!-- write logs to file  -->
    <target xsi:type="File" name="allfile" fileName="c:\temp\nlog-all-${shortdate}.log"
            layout="${longdate}|${event-properties:item=EventId_Id}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}" />

    <!-- another file log, only own logs. Uses some ASP.NET core renderers -->
    <target xsi:type="File" name="ownFile-web" fileName="c:\temp\nlog-own-${shortdate}.log"
            layout="${longdate}|${event-properties:item=EventId_Id}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}|url: ${aspnet-request-url}|action: ${aspnet-mvc-action}" />
  </targets>

  <!-- rules to map from logger name to target -->
  <rules>
    <!--All logs, including from Microsoft-->
    <logger name="*" minlevel="Trace" writeTo="allfile" />

    <!--Skip non-critical Microsoft logs and so log only own logs-->
    <logger name="Microsoft.*" maxlevel="Info" final="true" /> <!-- BlackHole without writeTo -->
    <logger name="*" minlevel="Trace" writeTo="ownFile-web" />
  </rules>
</nlog>

appsettings.json

{
  "Logging": {
    "LogLevel": {
      "Default": "Trace",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "AllowedHosts": "*"
}

WeatherForecastController.cs

private readonly ILogger<WeatherForecastController> _logger;

public WeatherForecastController(ILogger<WeatherForecastController> logger)
{
    _logger = logger;
}

[HttpGet]
public IEnumerable<WeatherForecast> Get()
{
    _logger.LogTrace("ILogger LogTrace from WeatherForecastController.");
    _logger.LogDebug("ILogger LogDebug from WeatherForecastController.");
    _logger.LogInformation("ILogger LogInformation from WeatherForecastController.");
    _logger.LogWarning("ILogger LogWarning from WeatherForecastController.");
    _logger.LogError("ILogger LogError from WeatherForecastController.");
    _logger.LogCritical("ILogger LogCritical from WeatherForecastController.");
    var rng = new Random();
    return Enumerable.Range(1, 5).Select(index => new WeatherForecast
    {
        Date = DateTime.Now.AddDays(index),
        TemperatureC = rng.Next(-20, 55),
        Summary = Summaries[rng.Next(Summaries.Length)]
    })
    .ToArray();
}

日志文件中的输出

2020-05-26 09:48:41.2752||TRACE|NLogTest.Program|NLog Trace from Main() |url: |action: 
2020-05-26 09:48:41.3081||DEBUG|NLogTest.Program|NLog Debug from Main() |url: |action: 
2020-05-26 09:48:41.3081||INFO|NLogTest.Program|NLog Info from Main() |url: |action: 
2020-05-26 09:48:41.3081||WARN|NLogTest.Program|NLog Warn from Main() |url: |action: 
2020-05-26 09:48:41.3081||ERROR|NLogTest.Program|NLog Error from Main() |url: |action: 
2020-05-26 09:48:41.3081||FATAL|NLogTest.Program|NLog Fatal from Main() |url: |action: 
2020-05-26 09:48:41.9009||INFO|NLogTest.Controllers.WeatherForecastController|ILogger LogInformation from WeatherForecastController. |url: https://localhost/weatherforecast|action: Get
2020-05-26 09:48:41.9162||WARN|NLogTest.Controllers.WeatherForecastController|ILogger LogWarning from WeatherForecastController. |url: https://localhost/weatherforecast|action: Get
2020-05-26 09:48:41.9162||ERROR|NLogTest.Controllers.WeatherForecastController|ILogger LogError from WeatherForecastController. |url: https://localhost/weatherforecast|action: Get
2020-05-26 09:48:41.9219||FATAL|NLogTest.Controllers.WeatherForecastController|ILogger LogCritical from WeatherForecastController. |url: https://localhost/weatherforecast|action: Get

现在有人能告诉我为什么 ILogger 不写 TRACE 和 DEBUG 消息吗？我已经在谷歌上搜索了几个小时，据我所知，一切都应该正确设置(？)。

谢谢!

Answer 1

正如 rolf 所说，如果您只是使用 Visual Studio IIS express 调试 asp.net 核心应用程序，则应该使用 appsettings.development.json 而不是 appsettings.json，因为 ASPNETCORE_ENVIRONMENT 环境变量已更改为 Development .

您可以在 launchSettings.json 中找到以下设置:

  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "launchUrl": "weatherforecast",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "CoreWebAPIIssue": {
      "commandName": "Project",
      "launchBrowser": true,
      "launchUrl": "weatherforecast",
      "applicationUrl": "https://localhost:5001;http://localhost:5000",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    }
  }

您应该修改 appsettings.development.json 如下:

{
  "Logging": {
    "LogLevel": {
      "Default": "Trace",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  }
}

结果: