我正在使用NLog,并尝试使用Microsoft.Extensions.Logging qssembly中的ILogger <>记录事件。 根据文档,一切都正确,例如nlog.config和Ilogger注入等。但是ILogger的方法根本不起作用。
这些是一些有效的代码,我可以在文件中看到结果:
using NLog;
Logger logger = LogManager.GetLogger("foo");
logger.Info("Program started");
但是我正在尝试这样做(不起作用):
using Microsoft.Extensions.Logging;
public class UserController : ControllerBase
{
public UserController(ILogger<UserController> logger)
{
_logger = logger;
}
public async Task<User> Create()
{
_logger.LogInformation("Create Method's called");
}
}
这是 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.log">
<extensions>
<add assembly="NLog.Web.AspNetCore"/>
</extensions>
<targets async="true">
<target xsi:type="File"
name="LogFile"
fileName="${basedir}\temp\nlog-${shortdate}.log"
layout="${longdate} | ${uppercase:${level}} | ${message} | ${exception:format=tostring} | ${logger} | url: ${aspnet-request-url} | action: ${aspnet-mvc-action}" />
</targets>
<rules>
<logger name="*" minlevel="Info" writeTo="LogFile" />
</rules>
</nlog>
这是在 Program.cs 内部:
public static void Main(string[] args)
{
Logger loggerN = LogManager.GetLogger("foo");
loggerN.Info("Program started");
var logger = NLogBuilder.ConfigureNLog("nlog.config").GetCurrentClassLogger();
try
{
logger.Debug("init Main");
CreateWebHostBuilder(args).Build().Run();
}
catch (Exception e)
{
logger.Error(e, "Program Shuted down");
throw;
}
finally
{
LogManager.Shutdown();
}
}
public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseNLog()
.ConfigureLogging(options => { options.ClearProviders(); })
.UseStartup<Startup>();
}
这里只有 Main 的前两行有效。
答案 0 :(得分:4)
将UseNLog()
移动到ConfigureLogging(options => { options.ClearProviders(); })
之后。例如:
public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseStartup<Startup>()
.ConfigureLogging(options => { options.ClearProviders(); })
.UseNLog();
如果您在options.ClearProviders()
之后调用UseNLog()
,则会导致NLog被删除为日志记录提供程序。