Angular 2 : Can't resolve all parameters for Router

Question

目标

在不失去理智的情况下让路由正常工作。

错误

Error: Can't resolve all parameters for Router: (?, ?, ?, ?, ?, ?, ?, ?)

---

app.routing.ts

import { ModuleWithProviders } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';

import { NavbarComponent } from './navbar/navbar.component';
import { CustomerComponent } from './customer/customer.component';

export const appRoutes: Routes = [
    { path: '', redirectTo: 'customers', pathMatch: 'full' },
    { path: 'customers', component: CustomerComponent },
];

export const routing: ModuleWithProviders = RouterModule.forRoot(appRoutes);

app.module.ts

import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { BrowserModule } from '@angular/platform-browser';

import { routing } from './app.routing';
import { AppComponent } from './app.component';
import { NavbarComponent } from './navbar/navbar.component';
import { CustomerComponent } from './customer/customer.component';

@NgModule({
    imports: [
        BrowserModule,
        FormsModule,
        routing
    ],
    declarations: [
        AppComponent,
        NavbarComponent,
        CustomerComponent,
    ],
    providers: [
        // ...
    ],
    bootstrap: [ AppComponent ]
})
export class AppModule {
    // ...
}

app.component.ts

import { RouterLink } from '@angular/router';
import { HTTP_PROVIDERS } from '@angular/http';
import { Component } from '@angular/core';

import { NavbarComponent } from './navbar/navbar.component';
import { CustomerComponent } from './customer/customer.component';

export { Config } from './config/env.config';

@Component({
    moduleId: module.id,
    selector: 'app',
    templateUrl: 'app.component.html',
    styleUrls: ['app.component.css'],
    directives: [NavbarComponent, CustomerComponent],
    providers: [HTTP_PROVIDERS, RouterLink]
})
export class AppComponent
{
    constructor() {
        // console.log('Environment config', Config);
    }

    ngOnInit() {
        // ...
    }
}

navbar.component.ts

import { Router, ROUTER_DIRECTIVES } from '@angular/router';
import { Component } from '@angular/core';

@Component({
    moduleId: module.id,
    selector: 'navbar',
    templateUrl: 'navbar.component.html',
    styleUrls: ['navbar.component.css'],
    directives: [ROUTER_DIRECTIVES],
    providers: [Router],
})
export class NavbarComponent
{
    version: string;
    versionIsVisible: boolean;

    constructor() {
        this.version = '<%= VERSION %>';
    }

    ngOnInit() {
        // ...
    }
}

app.component.html

<navbar></navbar>

<router-outlet></router-outlet>

navbar.component.html

<a routerLink="/customers">Customers</a>

Answer 1

现在感谢旧帖子，但我遇到了同样的问题并且刚刚解决了它。

该错误提示 Angular 无法解析 Router 类的某些依赖项。

navbar.component.ts

import { Router, ROUTER_DIRECTIVES } from '@angular/router';
import { Component } from '@angular/core';

@Component({
  moduleId: module.id,
  selector: 'navbar',
  templateUrl: 'navbar.component.html',
  styleUrls: ['navbar.component.css'],
  directives: [ROUTER_DIRECTIVES],
  providers: [Router],
})

我通过不将 Router 作为提供者注入(inject)，而只注入(inject)构造函数来解决此问题，因此您最终得到:

@Component({
    moduleId: module.id,
    selector: 'navbar',
    templateUrl: 'navbar.component.html',
    styleUrls: ['navbar.component.css'],
    directives: [ROUTER_DIRECTIVES]
  })

  export class NavbarComponent
  {
    version: string;
    versionIsVisible: boolean;

    constructor(private _router: Router) {
      this.version = '<%= VERSION %>';
    }

    ngOnInit() {
      // ...
    }
}

我是 angular2 的新手，所以我不能给你一个详细的原因!