NullInjectorError：没有ActivatedRouteSnapshot 的提供者

constructor(private activatedSnapshot: ActivatedSnapshot, private store: Store) {}

route() {
    this.store.dispatch(new Navigate(
       ['..', 'contacts'], 
       null, 
       { relativeTo: this.activatedSnapshot }
    )); 
}

有什么东西我应该进口吗？

尝试注射激活路由 https://angular.io/api/router/ActivatedRoute代替ActivatedSnapshot.

那么代码就会变成：

constructor(private activatedRoute: ActivatedRoute, private store: Store) {}

route() {
    this.store.dispatch(new Navigate(
       ['..', 'contacts'], 
       null, 
       { relativeTo: this.activatedRoute }
    )); 
}