app.module.ts找不到管道名稱

Question

我正在嘗試使用Angular 2創建一個簡單的應用程序，並且在使用Pipe裝飾器時遇到問題。我正在使用Pipe來訪問數據值，這在Angular 1中可以非常輕鬆地完成。爲了使用PIPE實現這個功能，我幾乎複製了template發佈在相關的SO question中，但我的app.module.ts除外。

ERROR in /Users/me/thisapp/mybio/src/app/app.module.ts (20,5): Cannot find name 'KeysPipe'.) 

我試圖複製管道的名字在我的app.module.ts聲明，但這並沒有解決問題。總的來說，我很迷惑Component，Module和pipe.ts文件如何交互。如果能夠解釋問題，我將不勝感激。

app.module.ts

import { BrowserModule } from '@angular/platform-browser'; 
import { NgModule } from '@angular/core'; 
import { FormsModule } from '@angular/forms'; 
import { HttpModule } from '@angular/http'; 
import { Pipe, PipeTransform } from '@angular/core'; 
import { routes } from './app.router'; 
import { AppComponent } from './app.component'; 
import { AppResumeComponent } from './app-resume/app-resume.component'; 
import { EducationComponent } from './education/education.component'; 
import { WorkxpComponent } from './workxp/workxp.component'; 
import { LaughComponent } from './laugh/laugh.component'; 

@NgModule({ 
    declarations: [ 
    AppComponent, 
    AppResumeComponent, 
    EducationComponent, 
    WorkxpComponent, 
    LaughComponent, 
    KeysPipe 
    ], 
    imports: [ 
    BrowserModule, 
    FormsModule, 
    HttpModule, 
    routes 
    ], 
    providers: [], 
    bootstrap: [AppComponent] 
}) 
export class AppModule { } 

pipe.ts

@Pipe({name:'keys'}) 
export class KeysPipe implements PipeTransform { 
    transform(value,args:string[]) : any { 
    let keys = []; 
    for (let key in value){ 
     keys.push({key: key, value: value[key]}); 
    } 
    return keys 
} 
} 

laugh.component.ts

import {Component, Pipe, PipeTransform} from '@angular/core'; 


import {KeysPipe} from './pipe' 

@Component({ 
    selector: 'my-app', 
    templateUrl: 'laugh.component.html', 
}) 
export class LaughComponent { 

    demo = { 
    'key1': 'ANGULAR 2', 
    'key2': 'Pardeep', 
    'key3': 'Jain', 
    } 
} 

Answer 1

您需要導入添加到module.ts

import {KeysPipe} from './pipe'