asp。netcore5。0使用nlog

　　创建项目，安装Nuget包NLog.Web.AspNetCoreInstall-Package NLog.Web.AspNetCore 4.14.0在项目根目录下创建配置文件nlog.config<?xml version=＂1.0＂ encoding=＂utf-8＂?>  	 		 	 	 	 		 		 		 		 	 	 		 		 		 		 	 修改Program.cspublic class Program { 	public static void Main(string[] args) 	{ 		var logger = NLog.LogManager.Setup().LoadConfigurationFromAppSettings().GetCurrentClassLogger(); 		try 		{ 			CreateHostBuilder(args).Build().Run(); 		} 		catch (Exception exception) 		{ 			logger.Error(exception, ＂Stopped program because of exception＂); 			throw; 		} 		finally 		{ 			NLog.LogManager.Shutdown(); 		} 	}  	public static IHostBuilder CreateHostBuilder(string[] args) => 		Host.CreateDefaultBuilder(args) 			.ConfigureWebHostDefaults(webBuilder => 			{ 				webBuilder.UseStartup(); 			}) 			.ConfigureLogging(logging => 			{ 				logging.ClearProviders(); 				logging.SetMinimumLevel(LogLevel.Trace); 			}) 			.UseNLog(); }构造注入ILogger使用public class WeatherForecastController : ControllerBase { 	private readonly ILogger _logger;  	public WeatherForecastController(ILogger logger) 	{ 		_logger = logger; 	}  	[HttpGet] 	public IEnumerable Get() 	{ 		_logger.LogInformation(＂infomation＂); 		_logger.LogError(＂error＂); 		return Enumerable.Empty(); 	} }自定义配置文件和多环境支持
　　在Program.cs的main方法开头将logger初始化的代码替换为如下代码即可var env = Environment.GetEnvironmentVariable(＂ASPNETCORE_ENVIRONMENT＂) ?? Environments.Production; var logger = NLog.LogManager.Setup(setupBuilder => { 		setupBuilder.LogFactory.LoadConfiguration(#34;nlog.{env}.config＂); 	}).GetCurrentClassLogger();