Angular 2 注入器在加载自定义异常处理程序时找不到服务

Question

尝试将服务注入我的 CustomExceptionHandler 时，Angular 注入器找不到该服务。

错误：Uncaught Can't resolve all parameters for CustomExceptionHandler: (?).

设置：

CustomExceptionHandler

import { ExceptionHandler } from '@angular/core';

import { ServiceA } from '../services/a.service';

export class CustomExceptionHandler extends ExceptionHandler {

  constructor(private serviceA: ServiceA) {
    super(null, null);
  }

  call(error, stackTrace = null, reason = null) {
      //do something with the service
  }
}

app.module

@NgModule({
  declarations: [
    ...
  ],
  imports: [
    ...
  ],
  providers: [
    ServiceA,
    { provide: ExceptionHandler, useClass: CustomExceptionHandler },
  ],
  bootstrap: [AppComponent],
})
export class AppModule { }

Answer 1

您还需要将 CustomExceptionHandler 及其依赖项添加到 providers：

@NgModule({
  declarations: [
    ...
  ],
  imports: [
    ...
  ],
  providers: [
    ServiceA,
    CustomExceptionHandler,
    { provide: ExceptionHandler, useClass: CustomExceptionHandler },
  ],
  bootstrap: [AppComponent],
})
export class AppModule { }

Answer 2

更新 ExceptionHandler 已重命名为 ErrorHandler

原创

将 @Injectable() 添加到您的 CustomExceptionHandler class。

将 CustomExceptionHandler 添加为 app.module.ts 中的另一个提供程序：

@NgModule({
  declarations: [
    ...
  ],
  imports: [
    ...
  ],
  providers: [
    ServiceA,
    CustomExceptionHandler,
    { provide: ExceptionHandler, useClass: CustomExceptionHandler },
  ],
  bootstrap: [AppComponent],
})
export class AppModule { }

Angular 2 注入器在加载自定义异常处理程序时找不到服务

Angular 2 injector can't find Service when loading CustomExceptionHandler

angular2-injection

angular