订阅仅在首次初始化后返回空数组

Question

我有一个数组的订阅，应该在触发事件时重置，但是当事件被触发时，我的composent不是因为数组是空的。

我的代码看起来像这样

ngOnInit() 
    this.listUnstagedFilesSubscription = this.rightPanelService.listUnstagedFilesSubject.subscribe(
      (listUnstagedFiles: any) => 
        this.listUnstagedFiles = listUnstagedFiles;
        this.setUnstageTree(listUnstagedFiles);
      );
    this.rightPanelService.emitListUnstagedFilesSubject();

setUnstageTree将使用'listUnstagedFiles'来填充另一个数组，然后用于显示我的组件。

问题是我不知道为什么它不起作用，因为组件总是在触发事件之前工作，如果我通过在某处调用函数ngOnInit（）强制组件重新加载，它会再次起作用

这是调用订阅的代码

import  Injectable  from '@angular/core';
import  Subject  from 'rxjs';

@Injectable()
export class RightPanelService 
  isView: Boolean;
  isViewSubject = new Subject<Boolean>();
  listUnstagedFiles: any[];
  listUnstagedFilesSubject: Subject<any[]>;
  listStagedFiles: any[];
  listStagedFilesSubject: Subject<any[]>;
  commitHash: String;
  commitHashSubject: Subject<String>;

  constructor() 
    this.commitHashSubject = new Subject<String>();
    this.isViewSubject = new Subject<Boolean>();
    this.isView = true;
    this.emitIsViewSubject();
    this.listUnstagedFilesSubject = new Subject<any[]>();
    this.listStagedFilesSubject = new Subject<any[]>();
  

  emitIsViewSubject() 
    this.isViewSubject.next(this.isView);
  

  emitListUnstagedFilesSubject() 
    this.listUnstagedFilesSubject.next(this.listUnstagedFiles);
  

  emitListStagedFilesSubject() 
    this.listStagedFilesSubject.next(this.listStagedFiles);
  

  setView(view: boolean) 
    this.isView = view;
    this.emitIsViewSubject();
  

  setListFileCommit(listUnstagedFiles: any[], listStagedFiles: any[]) 
    this.listUnstagedFiles = listUnstagedFiles;
    this.listStagedFiles = listStagedFiles;
    this.emitListUnstagedFilesSubject();
    this.emitListStagedFilesSubject();
  

  emitCommitHashSubject() 
    this.commitHashSubject.next(this.commitHash);
  


  setCommitHash(hash: String) 
    this.commitHash = hash;
    this.emitCommitHashSubject();