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背景

.NET Core 支持適用于各種內(nèi)置和第三方日志記錄提供程序的日志記錄 API。先來看下如何將日志記錄 API 與內(nèi)置提供程序一起使用。

調(diào)用 CreateDefaultBuilder，這將添加以下日志記錄提供程序：

控制臺
調(diào)試
EventSource
EventLog：僅限 Windows

public class Program{    public static void Main(string[] args)    {        CreateHostBuilder(args).Build().Run();    }
    public static IHostBuilder CreateHostBuilder(string[] args) =>        Host.CreateDefaultBuilder(args)            .ConfigureWebHostDefaults(webBuilder =>            {                webBuilder.UseStartup<Startup>();            });}

實現(xiàn)思路

若要替代Host.CreateDefaultBuilder 添加的默認日志記錄提供程序集，請調(diào)用 ClearProviders 并添加所需的日志記錄提供程序。例如，以下代碼：

調(diào)用 ClearProviders 以從生成器中刪除所有 ILoggerProvider 實例。
添加控制臺日志記錄提供程序。

public static IHostBuilder CreateHostBuilder(string[] args) =>    Host.CreateDefaultBuilder(args)        .ConfigureLogging(logging =>        {            logging.ClearProviders();            logging.AddConsole();        })        .ConfigureWebHostDefaults(webBuilder =>        {            webBuilder.UseStartup<Startup>();        });

Nlog案例

使用第三方替代，以Nlog為例

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

寫日志

using Microsoft.Extensions.Logging;
public class HomeController : Controller{    private readonly ILogger<HomeController> _logger;
    public HomeController(ILogger<HomeController> logger)    {        _logger = logger;        _logger.LogDebug(1, "NLog injected into HomeController");    }
    public IActionResult Index()    {        _logger.LogInformation("Hello, this is the index!");        return View();    }