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.
angular2-polyfills.js:332 Error: Cannot read property ‘getOptional’ of
undefined…….

看看这个Plnkr.如何在不收到此警告的情况下使用RouteParams？

重要文件是：

boot.ts：

import {bootstrap} from 'angular2/platform/browser';
import {ROUTER_PROVIDERS,RouteParams} from 'angular2/router';
import {AppComponent} from './app/app.component';

bootstrap(AppComponent,[ROUTER_PROVIDERS,RouteParams]);

和app.component.ts：

import {Component,OnInit} from 'angular2/core';
import {RouteParams} from "angular2/router";

@Component({
  selector: 'app',template: `
    <p *ngIf="guid">guid gived is: {{guid}}</p>
    <p *ngIf="!guid">No guid given in query-string in URL</p>
  `
})
export class AppComponent implements OnInit {
  guid:string;

  constructor(private _params: RouteParams) {} //

  ngOnInit() {
    this.guid = this._params.get('guid');
  }

}

更新：

我没有任何路由,我只有默认的根路由(如果我没有其他路由,那么可以称之为路由……).但正如Gianluca建议的那样,我添加了以下路由配置：

@RouteConfig([
  { path: '/:guid',name: 'Home',component: AppComponent,useAsDefault: true },])

但我仍然得到同样的错误(Plnkr更新)…