Angular 2访问来自子组件的父路由队列

Question

我有这个(主要的父母)组件 -

@RouteConfig([
    { path: '/', name: 'ProjectList', component: ProjectListComponent, useAsDefault: true },
    { path: '/new', name: 'ProjectNew', component: ProjectFormComponent },
    { path: '/:id', name: 'ProjectDetail', component: ProjectDetailComponent },
    { path: '/:id/issues/...', name: 'Issue', component: IssueMountComponent },
])
class ProjectMountComponent {
}

然后我有第二个mount组件(主父的子代,下一个组件的父代)

@Component({
        template: `
        <div><router-outlet></router-outlet></div>
    `,
        directives: [RouterLink, RouterOutlet]
})
@RouteConfig([
        { path: "/", name: "IssueList", component: IssueListComponent, useAsDefault: true },
])
class IssueMountComponent {
    constructor(private _routeParams: RouteParams) {
    }
}

在这里,我可以毫无问题地访问routeParams(:id).现在,这是我需要:id来自uri 的值的组件.

@Component({
        template: `
        <h3>Issue List</h3>
        <ul>
            <issue-component *ngFor="#issue of issues" [issue]="issue"></issue-component>
        </ul>
    `,
        directives: [IssueComponent],
        providers: [IssueService]
})
class IssueListComponent implements OnInit {
        issues: Issue[];
        constructor(private _issueService: IssueService,
                                private _routeParams: RouteParams) {}

        getIssues() {
            let id = this._routeParams.get('id');
            console.log(this._routeParams);
            this._issueService.getIssues(id).then(issues => this.issues = issues);
        }

        ngOnInit() {
            this.getIssues();
        }
}

在此组件中,我无法访问:idroute参数的值.它始终为空.我究竟做错了什么？

这是组件层次结构 -

ProjectMountComponent - > IssueMountComponent - > IssueListComponent