我注意到在ILogger
的ConfigureServices
没有明确的Startup.cs
注册。
第一个问题:如何将ILogger
注入例如控制器。
第二个问题:如何配置ILogger
以注入中间件?
日志记录作为HostBuilder.Build流程的一部分添加
private void CreateServiceProvider()
{
var services = new ServiceCollection();
services.AddSingleton(_hostingEnvironment);
services.AddSingleton(_hostBuilderContext);
services.AddSingleton(_appConfiguration);
services.AddSingleton<IApplicationLifetime, ApplicationLifetime>();
services.AddSingleton<IHostLifetime, ConsoleLifetime>();
services.AddSingleton<IHost, Host>();
services.AddOptions();
services.AddLogging();//<--HERE
//...
WebHostBuilder.BuildCommonServices
private IServiceCollection BuildCommonServices(out AggregateException hostingStartupErrors)
{
//... code removed for brevity
var services = new ServiceCollection();
services.AddSingleton(_options);
services.AddSingleton<IHostingEnvironment>(_hostingEnvironment);
services.AddSingleton<Extensions.Hosting.IHostingEnvironment>(_hostingEnvironment);
services.AddSingleton(_context);
var builder = new ConfigurationBuilder()
.SetBasePath(_hostingEnvironment.ContentRootPath)
.AddConfiguration(_config);
_configureAppConfigurationBuilder?.Invoke(_context, builder);
var configuration = builder.Build();
services.AddSingleton<IConfiguration>(configuration);
_context.Configuration = configuration;
var listener = new DiagnosticListener("Microsoft.AspNetCore");
services.AddSingleton<DiagnosticListener>(listener);
services.AddSingleton<DiagnosticSource>(listener);
services.AddTransient<IApplicationBuilderFactory, ApplicationBuilderFactory>();
services.AddTransient<IHttpContextFactory, HttpContextFactory>();
services.AddScoped<IMiddlewareFactory, MiddlewareFactory>();
services.AddOptions();
services.AddLogging();
要将ILogger
注入控制器,只需将其作为依赖项包含在构造函数中
private readonly ILogger logger;
public MyController(ILogger<MyController> logger) {
this.logger = logger;
}
//...
并且框架将在激活时将其注入控制器。
参考Dependency injection into controllers in ASP.NET Core
与控制器一样,Middleware vai构造函数注入也可以这样做,
或直接进入Invoke
的per-request dependencies方法
public Task Invoke(HttpContext context, ILogger<MyMiddleware> logger) {
//...
}
像任何其他注入的服务