小编Sun*_*ati的帖子

封装参考

    <PackageReference Include="OpenTelemetry.Exporter.Jaeger" Version="1.4.0-beta.2" />
    <PackageReference Include="OpenTelemetry.Exporter.Prometheus" Version="1.2.0-rc5"/>
    <PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.0.0-rc9.8" />
    <PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.0.0-rc9.8" />
    <PackageReference Include="OpenTelemetry.Instrumentation.Http" Version="1.0.0-rc9.8" />

程序.cs

builder.Services.AddOpenTelemetryMetrics(b =>
{
    b.AddPrometheusExporter();
    b.AddMeter(TelemetryConstants.MyAppSource);
    b.SetResourceBuilder(resource);
    b.AddHttpClientInstrumentation();
    b.AddAspNetCoreInstrumentation();
});

当我运行该应用程序时，出现以下错误

System.TypeLoadException: 'Could not load type 'System.ServiceProviderExtensions' from assembly 'OpenTelemetry, Version=1.0.0.0, Culture=neutral, PublicKeyToken=7bd6737fe5b67e3c'.'

在app.UseOpenTelemetryPrometheusScrapingEndpoint();

我有组件 A、组件 B 和一项服务。我在服务中声明了 Subject 并订阅了组件 B. 中的主题，并且在导航到组件 B 之前，我将一些数据从组件 A 发送到主题。它正在导航到组件 B，但没有触发订阅方法。

服务：

@Injectable({
  providedIn: 'root'
})
export class ServiceTestService {
storage: Recipe;
recipeSelected = new Subject<any>();
constructor() { }

}

组件 A向 observable 发送消息

@Component({
  selector: 'app-recipe-item',
  templateUrl: './recipe-item.component.html'
 })

export class RecipeItemComponent implements OnInit {

@Input() recipe: Recipe;

  constructor(
     private recipeService: ServiceTestService,
     private rt: Router) { }

  ngOnInit() {
  }

  onRecipeSelected(name: number) {

this.recipeService.recipeSelected.next(this.recipe);
this.rt.navigate(['/recipe', this.ind]);

  }
}

组件 B： 这里我订阅了 Observable。

@Component({
  selector: 'app-recipe-detail',
  templateUrl: …