Angular2，RouteParams無法正常工作

Question

我收到一個錯誤，該錯誤當前引起很多挫敗感。 這是我運行的內容：

• ASP.NET Core 1.0 RC1
• Angular2，2.0.0-beta.15
• 打字稿，1.7.6.0

---

錯誤：

Angular 2 is running in the development mode. Call enableProdMode() to enable the production mode.
Attempting redirect to: /Design/0DEAC46A-7F58-49F9-B67E-2C187DFA49A7/
Navigated to http://localhost:5000/
EXCEPTION: Cannot resolve all parameters for 'RouteParams'(?). Make sure that all the parameters are decorated with Inject or have valid type annotations and that 'RouteParams' is decorated with Injectable.
EXCEPTION: Cannot resolve all parameters for 'RouteParams'(?). Make sure that all the parameters are decorated with Inject or have valid type annotations and that 'RouteParams' is decorated with Injectable.
EXCEPTION: Error: Uncaught (in promise): Cannot resolve all parameters for 'RouteParams'(?). Make sure that all the parameters are decorated with Inject or have valid type annotations and that 'RouteParams' is decorated with Injectable.
EXCEPTION: Error: Uncaught (in promise): Cannot resolve all parameters for 'RouteParams'(?). Make sure that all the parameters are decorated with Inject or have valid type annotations and that 'RouteParams' is decorated with Injectable.
STACKTRACE:
Error: Uncaught (in promise): Cannot resolve all parameters for 'RouteParams'(?). Make sure that all the parameters are decorated with Inject or have valid type annotations and that 'RouteParams' is decorated with Injectable.
    at resolvePromise (angular2-polyfills.js:602)
    at angular2-polyfills.js:638
    at ZoneDelegate.invokeTask (angular2-polyfills.js:423)
    at Object.NgZoneImpl.inner.inner.fork.onInvokeTask (angular2.js:2118)
    at ZoneDelegate.invokeTask (angular2-polyfills.js:422)
    at Zone.runTask (angular2-polyfills.js:320)
    at drainMicroTaskQueue (angular2-polyfills.js:541)
    at XMLHttpRequest.ZoneTask.invoke (angular2-polyfills.js:493)
Unhandled Promise rejection: Cannot resolve all parameters for 'RouteParams'(?). Make sure that all the parameters are decorated with Inject or have valid type annotations and that 'RouteParams' is decorated with Injectable. ; Zone: angular ; Task: Promise.then ; Value: NoAnnotationError {message: "Cannot resolve all parameters for 'RouteParams'(?)… that 'RouteParams' is decorated with Injectable.", stack: "Error: Cannot resolve all parameters for 'RoutePar…//localhost:5000/js/angular2/angular2.js:9448:46)"}
Error: Uncaught (in promise): Cannot resolve all parameters for 'RouteParams'(?). Make sure that all the parameters are decorated with Inject or have valid type annotations and that 'RouteParams' is decorated with Injectable.(…)
Unhandled Promise rejection: Cannot resolve all parameters for 'RouteParams'(?). Make sure that all the parameters are decorated with Inject or have valid type annotations and that 'RouteParams' is decorated with Injectable. ; Zone: <root> ; Task: Promise.then ; Value: NoAnnotationError {message: "Cannot resolve all parameters for 'RouteParams'(?)… that 'RouteParams' is decorated with Injectable.", stack: "Error: Cannot resolve all parameters for 'RoutePar…//localhost:5000/js/angular2/angular2.js:9448:46)"}
Error: Uncaught (in promise): Cannot resolve all parameters for 'RouteParams'(?). Make sure that all the parameters are decorated with Inject or have valid type annotations and that 'RouteParams' is decorated with Injectable.(…)

我有一個抽象基類，它具有兩個子類，它們充當Angular2組件。 每個都有一個采用RouteParams實例的構造函數。 子類一工作得很好，但是子類二無法加載上面的錯誤消息。

RouteDefinition實際上是一個AsyncRoute ，其定義路徑如下： path: '/:appId/:customerId/'

這是Angular嘗試反映RouteParams時引發的錯誤的屏幕截圖。

---

基類：

import {Component, OnInit} from "angular2/core";
import {RouteParams, Location} from "angular2/router";
import {CustomerService} from "../../shared/services/customer.service";

@Component({
    providers: [CustomerService]
})

export abstract class BaseCustomerSelectorComponent implements OnInit {
    protected params: RouteParams;

    constructor(private customerService: CustomerService,
                private routeParams: RouteParams,
                private ngLocation: Location) {
        this.params = routeParams;
    }

    ngOnInit() {
        // omitted..
    }
}

子類二：

import {Component} from "angular2/core";
import {RouteParams, Location} from "angular2/router";
import {BaseCustomerSelectorComponent} from "../../shared/components/base-customer-selector.component";
import {CustomerService} from "../../shared/services/customer.service";

@Component({
    selector: "customer-selector",
    templateUrl: "app/shell/templates/customer-selector.html",
    styleUrls: ["app/shell/styles/customer-selector.css"],
    providers: [CustomerService, Settings, RouteParams]
})

export class CustomerSelectorComponent extends BaseCustomerSelectorComponent {
    constructor(customerService: CustomerService,
                routeParams: RouteParams,
                ngLocation: Location) {
        super(customerService, routeParams, ngLocation);
    }
}

Answer 1

RouteParams只能注入到路由器添加的組件中。

在其他組件中，您可以注入Router並訂閱它。

  constructor(private router:Router) {
    router.subscribe(route => {
      console.debug(this.router.currentInstruction.component.params);
    });
  }

否則@kemsky說的話。

確保僅在根組件上添加ROUTER_PROVIDERS （或僅在bootstrap（）中添加）

Answer 2

從提供程序中刪除RouteParams ，注入應使用繼承的實例。

好了，檢查super調用，看來參數順序錯誤，設置是多余的。