为什么不能以角度2 +

Question

我是Angular的初学者。我的目标是创建一个仅包含开始目录的文件系统。第一次调用该组件时，它会从后端加载数据。第二次导航到子目录时，我执行console.log()来输出从路线获取的ID，它是正确的ID。

获取参数：

 this.router.params.subscribe(
      (params: Params) => {
        this.parentEntryId = +params['id'];
        console.log('directory ' + params.id);
      }
    );

我为什么不能到达：

console.log("foo")

我所有的代码：

import { Component, OnInit, OnDestroy } from '@angular/core';
import { Entry } from 'app/models/entry/entry.model';
import { EntryService } from 'app/service/entry.service';
import { AuthenticationService } from '../../service/authentication.service';
import {  ActivatedRoute, Params } from '@angular/router';

declare interface TableData {
  headerRow: string[];
  entries: Entry[];
}

@Component({
  selector: 'app-directory',
  templateUrl: './directory.component.html',
  styleUrls: ['./directory.component.css']
})
export class DirectoryComponent implements OnInit {


  tableData1: TableData;
  currentUserId: number;
  parentEntryId : number;

  constructor(
    // private route: Router,
    private router: ActivatedRoute,
    private entryService: EntryService,
    private authenticationService: AuthenticationService
  ) { }

  ngOnInit() {
    this.currentUserId = this.authenticationService.getLoggedUserId();

    this.tableData1 = {
      headerRow: ['ID', 'TYPE', 'EXECUTABLE', 'NAME', 'OWNER', 'OPERETION'],
      entries: []
    };

    this.router.params.subscribe(
      (params: Params) => {
        this.parentEntryId = +params['id'];
        console.log('directory ' + params.id);
      }
    );

    console.log("foo");
    console.log('parentId' + this.parentEntryId);
    this.entryService.listWithId(this.parentEntryId).subscribe(

      (data: Entry[]) => {
        console.log('enter here ');
        this.tableData1.entries = data;
      }
    );
  }
}