我找到了CodeProject并提供了一个如何使它工作的示例,但是它不起作用。主要问题似乎是"Microsoft.Framework.Logging.NLog": "1.0.0-*"
软件包似乎在Nuget中不存在。我看过this StackOverflow question并看过它引用的GitHub示例,但似乎包含相同的问题。
我试图让它自己工作,而我想出的最好的方法如下:
public class NLogLogger : ILogger
{
public NLogLogger()
{
new WebLoggerConfigurer().ConfigureDefault();
}
public void Log(LogLevel logLevel, int eventId, object state, Exception exception, Func<object, Exception, string> formatter)
{
// currently need the global:: for LogLevels because our namespace contains NLog in it. Is there a better naming convention we could use instead?
var ll = logLevel == LogLevel.Debug ? global::NLog.LogLevel.Debug
: logLevel == LogLevel.Verbose ? global::NLog.LogLevel.Trace
: logLevel == LogLevel.Critical ? global::NLog.LogLevel.Fatal
: logLevel == LogLevel.Error ? global::NLog.LogLevel.Error
: logLevel == LogLevel.Information ? global::NLog.LogLevel.Info
: logLevel == LogLevel.Warning ? global::NLog.LogLevel.Warn
: global::NLog.LogLevel.Off;
LogManager.GetCurrentClassLogger().Log(ll, formatter(state, exception));
}
public bool IsEnabled(LogLevel logLevel)
{
return true;
}
public IDisposable BeginScopeImpl(object state)
{
return new Disposable(() => { });
}
}
public class NLogLoggerProvider : ILoggerProvider
{
public void Dispose()
{
}
public ILogger CreateLogger(string categoryName)
{
return new NLogLogger();
}
}
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
loggerFactory.AddProvider(new NLogLoggerProvider());
..
}
BeginScopeImpl的实现似乎是一个hack,但是我不确定如何最好地实现它。
这看起来像是有效的实现选项吗?
有没有更好的方法来实现BeginScopeImpl?
是否存在使NLog与ASP.NET Core一起工作的另一种方法?
参考方案
Microsoft.Framework.Logging.NLog已替换为NLog.Extensions.Logging on NuGet,由NLog团队维护。
对于ASP.NET Core,您需要NLog.Web.AspNetCore(该依赖于
NLog.Extensions.Logging)
如何使用:
建立
需要启用NLog,以便将其集成到ASP.NET Core的DI和日志API中。
这将导致所有由外部人员(例如Microsoft)编写的日志也将发送到NLog-您可以在NLog的配置中将其过滤掉(不会影响性能)
从ASP.NET Core 2开始,就有了新的方法。
ASP.NET Core 1
在ASP.NET Core中,Configure
和可选的ConfigureServices
需要进行更新。
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
//add NLog to .NET Core
loggerFactory.AddNLog();
//Enable ASP.NET Core features (NLog.web) - only needed for ASP.NET Core users
app.AddNLogWeb();
//configure nlog.config in your project root.
env.ConfigureNLog("nlog.config");
...
//you could use LogManager.Configuration from here
public void ConfigureServices(IServiceCollection services)
{
// Add framework services.
// e.g. services.AddMvc();
//needed for NLog.Web
services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
}
ASP.NET Core 2
对于ASP.NET Core 2,设置与ASP.NET Core 1中的设置不同
在program.cs中设置NLog:
using NLog.Web;
using Microsoft.Extensions.Logging;
public static void Main(string[] args)
{
// NLog: setup the logger first to catch all errors
var logger = NLog.Web.NLogBuilder.ConfigureNLog("nlog.config").GetCurrentClassLogger();
try
{
logger.Debug("init main");
CreateWebHostBuilder(args).Build().Run();
}
catch (Exception ex)
{
//NLog: catch setup errors
logger.Error(ex, "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 IWebHostBuilder CreateWebHostBuilder(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseStartup<Startup>()
.ConfigureLogging(logging =>
{
logging.ClearProviders();
logging.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);
})
.UseNLog(); // NLog: setup NLog for Dependency injection
ASP.NET Core 3
与ASP.NET Core 2相比,有一些小的变化,例如有一个IHostBuilder
而不是IWebHostBuilder
在program.cs中设置NLog:
using System;
using NLog.Web;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Hosting;
public static void Main(string[] args)
{
var logger = NLog.Web.NLogBuilder.ConfigureNLog("nlog.config").GetCurrentClassLogger();
try
{
logger.Debug("init 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(logging =>
{
logging.ClearProviders();
logging.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);
})
.UseNLog(); // NLog: Setup NLog for Dependency injection
写日志
插入一个ILogger
并将类类型作为通用参数。
public class HomeController : Controller
{
public HomeController(ILogger<HomeController> logger)
{
logger.LogInformation("created homeController");
}
配置NLog规则
示例如何配置,记录和过滤。
创建一个nlog.config(有关nlog.config的更多信息,请参见docs)
本示例将创建2个文件,一个将创建所有日志(包括Microsoft的日志),一个仅包含您的日志的文件。
<?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="Warn"
internalLogFile="c:\temp\internal.txt">
<extensions>
<!--enable NLog.Web for ASP.NET Core-->
<add assembly="NLog.Web.AspNetCore"/>
</extensions>
<!-- define various log targets -->
<targets>
<!-- write logs to file -->
<target xsi:type="File" name="allfile" fileName="c:\temp\nlog-all-${shortdate}.log"
layout="${longdate}|${logger}|${uppercase:${level}}|${message} ${exception}" />
<target xsi:type="File" name="ownFile" fileName="c:\temp\nlog-own-${shortdate}.log"
layout="${longdate}|${logger}|${uppercase:${level}}|${message} ${exception}" />
</targets>
<rules>
<!--All logs, including from Microsoft-->
<logger name="*" minlevel="Trace" writeTo="allfile" />
<!--Skip Microsoft logs - no writeTo attribute-->
<logger name="Microsoft.*" minlevel="Trace" final="true" />
<logger name="*" minlevel="Trace" writeTo="ownFile" />
</rules>
</nlog>
发布nlog.config
确保nlog.config将被发布,例如在您的csproj文件中:
<ItemGroup>
<Content Update="nlog.config" CopyToOutputDirectory="PreserveNewest" />
</ItemGroup>
输出量
“ nlog-own-2018-02-14.log”包含:
2018-02-14 16:27:04.0547 | aspnetCoreApplication.Controllers |信息|创建了homeController
2018-02-14 16:27:04.0547 | aspnetCoreApplication.Controllers |信息|创建了homeController
疑难排解
ASP.NET Core 2中缺少调试日志消息吗?虽然我们在program.cs中使用SetMinimumLevel
,但appsettings.json也可以使之融合。
您可以如下进行更改:
更改appsettings.json:
{
"Logging": {
"LogLevel": {
"Default": "Trace"
}
}
}
您也可以在此处过滤Microsoft的日志,例如
{
"Logging": {
"LogLevel": {
"Default": "Trace",
"Microsoft": "Information"
}
}
}
其他问题,请参阅此步骤计划以查找原因:
Logging-troubleshooting in NLog
干杯,
朱利安(NLog)
编辑:已更新为NLog.Web.AspNetCore 4.3
编辑2:已更新ASP.NET Core 2和最新建议
编辑3:已针对ASP.NET Core 3更新
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