ASP.NET Core 3 NLog配置
使用NLog记录日志
手动或使用NuGet在csproj中添加依赖项
- 安装最新版本：
- NLog.Web.AspNetCore 4.9+
- 如有可能，更新NLog软件包
创建nlog.config文件。
在项目的根目录中创建nlog.config（全部小写）文件。
我们使用以下示例：
<?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">
<!-- enable asp.net core layout renderers -->
<extensions>
<add assembly="NLog.Web.AspNetCore"/>
</extensions>
<!-- the targets to write to -->
<targets>
<!--写入文件-->
<target
xsi:type="File"
name="DebugFile"
fileName="Logs\Debug\${shortdate}.log"
layout="日志时间：${longdate}${newline}日志来源：${callsite}${newline}日志级别：${uppercase:${level}}${newline}消息内容：${message}${newline}----------------------------------------------------------------${newline}" >
</target>
<target
xsi:type="File"
name="InfoFile"
fileName="Logs\Info\${shortdate}.log"
layout="日志时间：${longdate}${newline}日志来源：${callsite}${newline}日志级别：${uppercase:${level}}${newline}消息内容：${message}${newline}----------------------------------------------------------------${newline}" >
</target>
<target
xsi:type="File"
name="ErrorFile"
fileName="Logs\Error\${shortdate}.log"
layout="日志时间：${longdate}${newline}日志来源：${callsite}${newline}日志级别：${uppercase:${level}}${newline}消息内容：${message}${newline}异常信息：${exception:format=tostring}${newline}----------------------------------------------------------------${newline}" >
</target>
</targets>
<!-- rules to map from logger name to target -->
<rules>
<!--Skip non-critical Microsoft logs and so log only own logs-->
<logger name="Microsoft.*" maxlevel="Info" final="true" />
<logger name="*" minlevel="Debug" maxLevel="Debug" writeTo="DebugFile" />
<logger name="*" minlevel="Info" maxLevel="Info" writeTo="InfoFile" />
<logger name="*" minlevel="Error" maxLevel="Error" writeTo="ErrorFile" />
</rules>
</nlog>
注意:日志生成的文件在bin目录下
配置文件的更多详细信息在这里
请注意，如果删除所有其他LoggingProviders（如控制台）并且仅使用NLog，则可能必须特别注意Hosting Lifetime Startup Messages。因为这可能导致托管环境（Visual Studio / Docker / Azure容器）看不到启动的应用程序。
启用复制到bin文件夹
- .csproj手动编辑文件并添加：
<ItemGroup> <Content Update="nlog.config" CopyToOutputDirectory="PreserveNewest" /> </ItemGroup>
修改 program.cs
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
配置 appsettings.json
{
"Logging": {
"IncludeScopes": false,
"LogLevel": {
"Default": "Trace",
"Microsoft": "Warning",
"Microsoft.Hosting.Lifetime": "Information"
}
},
"AllowedHosts": "*"
}
切记还要更新任何特定于环境的配置，以免引起任何意外。
写日志
using Microsoft.Extensions.Logging;
public class HomeController : Controller
{
private readonly ILogger<HomeController> _logger;
public HomeController(ILogger<HomeController> logger)
{
_logger = logger;
}
public IActionResult Index()
{
_logger.LogInformation("这是Info等级的信息");
return View();
}
}
输出
日志时间：2020-08-20 16:56:24.3082
日志来源：QS.Core.Web.Areas.Admin.Controllers.HomeController.Index
日志级别：INFO
消息内容：这是Info等级的信息
----------------------------------------------------------------
如果无法输出日志文件请检查appsettings.json文件或在bin目录下查看
