加载CustomExceptionHandler时，Angular 2注入器找不到服务

本文介绍了加载CustomExceptionHandler时，Angular 2注入器找不到服务的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

当尝试将服务注入到我的CustomExceptionHandler中时，Angular注入器找不到该服务.

When trying to inject a service into my CustomExceptionHandler, the Angular injector cannot find the service.

错误:未捕获无法解析CustomExceptionHandler的所有参数:(?).

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
  }
}

应用模块

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

推荐答案

更新 ExceptionHandler 重命名为 ErrorHandler

原始

将 @Injectable()添加到您的CustomExceptionHandler类中.

Add @Injectable() to your CustomExceptionHandler class.

在app.module.ts中添加CustomExceptionHandler作为您的另一个提供者:

Add CustomExceptionHandler as another one of your providers in the app.module.ts:

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

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