无法从模块 'it was neither declared nor imported' 导出服务

Question

我正在尝试从我的模块之一导出服务，但我只收到以下错误：

ERROR Error: Uncaught (in promise): 
Error: Can't export value ConfirmDialogService from SharedModule as it was neither declared nor imported!

我的模块如下：

import { NgModule }                 from "@angular/core";
import { CommonModule }             from "@angular/common";
import { FormsModule }              from "@angular/forms";
import { RouterModule }             from "@angular/router";
import { MaterialModule }           from "@angular/material";

import { ConfirmDialogComponent }       from './confirm-dialog/confirm-dialog.component';
import { ConfirmDialogService }         from './confirm-dialog/confirm-dialog.service';

@NgModule({
    imports: [
        RouterModule,
        CommonModule,
        MaterialModule,
        FormsModule
    ],
    providers: [
        ConfirmDialogService
    ],
    declarations: [
        ConfirmDialogComponent 
    ],
    exports: [
        ConfirmDialogComponent 
        ConfirmDialogService
    ]
})
export class SharedModule {}

文件确实存在并且在 TS 中被正确引用，但是当运行应用程序出现错误时。

Answer 1

您不需要在exports中列出服务，您可以只列出组件、指令和管道。对于服务，providers 是相关的，但除此之外，TypeScript 导入就足够了。

无法从模块 'it was neither declared nor imported' 导出服务

Cant export service from module 'it was neither declared nor imported'

angular2-services

angular