专门针对.Net core 3.1的NLog配置,通过名称/env指定nlog文件,并启用DI [英] NLog Configuration specifically for .net core 3.1 specifying the nlog file by name/env, and enabling DI
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问题描述
我知道有很多关于nlog配置的SO问题和在线文章,但我似乎找不到适用于我的特定场景和要求的示例。我对使用替代方法持开放态度,例如通过appsetups.[env].json进行配置,但希望避免多个web.config文件
我试过的一个例子:
public static void Main(string[] args)
{
var environment = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");
var logFile = "nlog.config";
if (environment.Contains("Debug") || environment.Contains("Local"))
logFile = "nlog.debug.config";
// logger works only in Main() method, not as DI
var logger = NLogBuilder.ConfigureNLog(logFile).GetCurrentClassLogger();
logger.Info("Starting My App");
CreateHostBuilder(args).Build().Run();
}
public static IHostBuilder CreateHostBuilder(string[] args) =>
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureAppConfiguration((hostingContext, config) =>
{
config.Sources.Clear();
var env = hostingContext.HostingEnvironment;
config.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json",
optional: true, reloadOnChange: true);
config.AddEnvironmentVariables();
if (args != null)
{
config.AddCommandLine(args);
}
})
...
.ConfigureLogging((hostingContext, logging) =>
{
logging.ClearProviders();
logging.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Debug);
logging.AddConsole();
})
.UseNLog(config); // << config has error, I can't seem to find a way to instanciate config.
}
推荐答案
您还可以考虑将特定于环境的设置放置在默认的appsettings.json
中,并用appsettings.[environment].json
覆盖。然后使用NLog.config
中的${configsetting}加载活动设置。
使用以下命令效果最佳:
var logger = NLog.LogManager.Setup().LoadConfigurationFromAppSettings().GetCurrentClassLogger();
logger.Info("Starting My App");
不再使用这个:
var logger = NLogBuilder.ConfigureNLog(logFile).GetCurrentClassLogger();
logger.Info("Starting My App");
另见:https://github.com/NLog/NLog/wiki/Getting-started-with-ASP.NET-Core-3
另见:https://github.com/NLog/NLog.Extensions.Logging/wiki/NLog-configuration-with-appsettings.json
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