how to access flutter bloc in the initState method?

The problem is that you are initializing the instance of FileManagerBloc inside the BlocProvider which is, of course inaccessible to the parent widget. I know that helps with automatic cleanup of the Bloc but if you want to access it inside initState or didChangeDependencies then you have to initialize it at the parent level like so,

FileManagerBloc _fileManagerBloc;@overridevoid initState() {  super.initState();  _fileManagerBloc= FileManagerBloc();  _fileManagerBloc.dispatch(LoadEducation());}@override  Widget build(BuildContext context) {    return Scaffold(        body: BlocProvider<FileManagerBloc>(          builder: (context)=> _fileManagerBloc,          child: SafeArea(      child: Container(          child: Column(            children: <Widget>[              Container(color: Colors.blueGrey, child: TopMenuBar()),              Expanded(                child: BlocBuilder<FileManagerBloc,FileManagerState>(                  builder: (context , state){                    return GridView.count(                      scrollDirection: Axis.vertical,                      physics: ScrollPhysics(),                      crossAxisCount: 3,                      crossAxisSpacing: 10,                      children: getFilesListWidget(context , state),                    );                  },                ),              )            ],          ),      ),    ),        ));  }  @override  void dispose() {    _fileManagerBloc.dispose();    super.dispose();  }  @override  void didChangeDependencies() {    logger.i('Did change dependency Called');    Messenger.sendGetHomeDir()        .then((path) async {      final files = await Messenger.sendListDir(path);        _fileManagerBloc.dispatch(SetCurrentWorkingDir(path)) ;        _fileManagerBloc.dispatch(UpdateFileSystemCacheMapping(path , files)) ;    });  }

alternatively, if FileManagerBloc was provided/initialized at a grandparent Widget then it could easily be accessible at this level through BlocProvider.of<CounterBloc>(context);

you can use it in didChangeDependencies method rather than initState.

Example

 @override  void didChangeDependencies() {    final CounterBloc counterBloc = BlocProvider.of<CounterBloc>(context);    //do whatever you want with the bloc here.    super.didChangeDependencies();  }