哪个是在asp.net core 2.0 Web应用程序中使用Nlog的最佳方式
我找到了很多不同的解决方案如何配置。这是其中两个。还有其他更好的方法吗?
A)在启动服务器之前创建记录器:
public class Program
{
public static void Main(string[] args)
{
// NLog: setup the logger first to catch all errors
var logger = NLogBuilder.ConfigureNLog("NLog.config").GetCurrentClassLogger();
try
{
logger.Debug("init main");
BuildWebHost(args).Run();
}
catch (Exception e)
{
//NLog: catch setup errors
logger.Error(e, "Stopped program because of exception");
throw;
}
}
public static IWebHost BuildWebHost(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseStartup<Startup>().UseNLog() // use NLog for DI Logger
.Build();
}
B)配置内部启动
public class Startup
{
public Startup(IHostingEnvironment env, IConfiguration configuration)
{
var builder = new ConfigurationBuilder()
.SetBasePath(env.ContentRootPath)
.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
.AddEnvironmentVariables();
Configuration = builder.Build();
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddMvc();
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
loggerFactory.AddNLog();
loggerFactory.ConfigureNLog("nlog.config");
LogManager.Configuration.Variables["connectionString"] = Configuration.GetConnectionString("myDb");
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseMvc();
}
}
有关于此的维基文档:
https://github.com/NLog/NLog.Web/wiki/Getting-started-with-ASP.NET-Core-2
要注入连接字符串之类的自定义数据,只需创建并注册自定义布局渲染器:
https://github.com/NLog/NLog/wiki/How-to-write-a-custom-layout-renderer
或者在启动时将连接字符串放入NLog-Global-Diagnostic-Context:
https://github.com/NLog/NLog/wiki/Var-Layout-Renderer
也许这样的地方NLog.config
使用${gdc:connectionString}
:
var myConnectionString = Configuration.GetConnectionString("myDb");
NLog.GlobalDiagnosticsContext.Set("connectionString", myConnectionString);
var logFactory = NLogBuilder.ConfigureNLog("NLog.config"); // Uses ${gdc:connectionString}
var logger = logFactory.GetCurrentClassLogger();
logger.Info("Hello World");
另见https://github.com/NLog/NLog/wiki/Gdc-Layout-Renderer
更新 - $ {configsetting}
NLog.Extension.Logging ver。 1.4现在支持${configsetting}
,因此NLog可以直接从appsettings.json读取设置,而无需使用NLog变量。见https://github.com/NLog/NLog/wiki/ConfigSetting-Layout-Renderer