如何使用第三方日志记录提供程序替代.NET Core中的内置程序

.NET Core 支持适用于各种内置和第三方日志记录提供程序的日志记录 API。 先来看下如何将日志记录 API 与内置提供程序一起使用。

调用 CreateDefaultBuilder，这将添加以下日志记录提供程序：

• 控制台

• 调试

• EventSource

• EventLog：仅限 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>();             }); }

  若要替代Host.CreateDefaultBuilder 添加的默认日志记录提供程序集，请调用 ClearProviders 并添加所需的日志记录提供程序。 例如，以下代码：

  • 调用 ClearProviders 以从生成器中删除所有 ILoggerProvider 实例。

  • 添加控制台日志记录提供程序。

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

    使用第三方替代，以Nlog为例

    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

    写日志

  • 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();     }