无法绑定到“ngForFor”，因为它不是“礼”的已知属性

Question

我app.module

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';

import { AppComponent } from './app.component';
import { routing, appRoutingProviders} from './app.routing'
import { ProductSearchModule} from './productSearch/productSearch.module'

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    routing,
    ProductSearchModule
  ],
  providers: [appRoutingProviders],
  bootstrap: [AppComponent]
})
export class AppModule { }

我productSearch.module

import {NgModule} from '@angular/core'
import {ProductSearchComponent} from './productSearch.component'

@NgModule({
    exports: [ProductSearchComponent],
    declarations: [ProductSearchComponent],

})

export class ProductSearchModule{}

我的产品搜索组件

import { Component, Output } from '@angular/core'
import { Product} from '../shared/product'

@Component({
    selector: 'product-search',
    templateUrl: 'productSearch.component.html',
    styleUrls: ['productSearch.component.css'],

})

export class ProductSearchComponent{
    /**
     *
     */
    constructor() {
        var p1 = new Product;
        p1.name = "alkan";

        var p2 = new Product;
        p2.name = "alper";
        this.Products = [p1, p2];

    }

    Products: Product[]

    search(){

    }
}

productSearch.component.html文件

<li *ngFor="let item for Products">{{item.name}}</li>

正如你所看到的，这个棱角分明的一个非常基本的例子。我只是想打印每一个产品的名称。

错误我得到：

无法绑定到“ngForFor”，因为它不是“礼”的已知属性。

更新：

元件构造改变

var p1 = new Product();
p1.name = "alkan";

var p2 = new Product();
p2.name = "alper";
this.Products = [p1, p2];

和模板HTML改变

<li *ngFor="let item of Products">{{item.name}}</li>

但我仍然得到错误：

Can't bind to 'ngForOf' since it isn't a known property of 'li'

Answer 1

    var p1 = new Product();   //<----added ();
    p1.name = "alkan";

    var p2 = new Product();   //<----added ();
    p2.name = "alper";
    this.Products = [p1, p2];

     //<---replace for keyword by of keyword
    <li *ngFor="let item of Products">{{item.name}}</li>   

更新

您还需要添加CommonModule如下图所示，

import {NgModule} from '@angular/core';   
import {ProductSearchComponent} from './productSearch.component'

import {CommonModule} from '@angular/common';

@NgModule({
    imports: [CommonModule],                   //<====added
    exports: [ProductSearchComponent],
    declarations: [ProductSearchComponent],

})

Answer 2

我认为这是：在let item of Products文件for不productSearch.component.html。检查documentation