typescript - Angular 2 錯誤：未處理的 Promise 拒絕：模板解析錯誤：多於一個元件：

幾個月前，我使用舊的 beta 開發了一個 Angular2 應用程式。 我目前正在將這個應用程式移至最新版本（RC5 版本）的全新構建，到目前為止一切順利。 直到我開始收到以下錯誤為止：

zone.js:484 Unhandled Promise rejection: Template parse errors:
More than one component: ProductComponent,OverlayComponent ("'noscroll': hideBody}">

我有一個子組件 product-component，它被作為 app-component 的子組件。我在 app.module.ts 文件中包含了這兩個組件。

我不確定這個錯誤意味著什麼，也尚未在網上找到任何相關的支援。以下是相關的檔案：

app.module.ts

import './rxjs-extensions';

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

import { AppComponent }   from './app.component';
import { ProductComponent }   from './components/product.component';
import { OverlayComponent }   from './components/overlay-component';

import { ProductService }   from './services/product.service';
import { CategoryService }   from './services/category.service';
import { Breadcrumb} from "./directives/breadcrumb";
import { CategoryTree } from "./directives/category-tree";
import { Files } from "./directives/files";
import { Gallery } from "./directives/gallery";
import { OrderInformation } from "./directives/order-information";




@NgModule({
    imports:      [
        BrowserModule,
        HttpModule
    ],
    declarations: [
        AppComponent,
        ProductComponent,
        OverlayComponent,
        Breadcrumb,
        CategoryTree,
        Files,
        Gallery,
        OrderInformation
    ],
    providers: [
        ProductService,
        CategoryService
    ],
    bootstrap:    [ AppComponent ]

})
export class AppModule { }

app.component.ts

import { Component } from '@angular/core';
import { Product } from "./classes/Product";
import { ProductService } from "./services/product.service";
import { Category } from "./classes/Category";
import { CategoryService } from "./services/category.service";

@Component({
    selector: 'product-display',
    templateUrl: './app/views/main-view.html'
})

export class AppComponent {
    title = `St. David's Poultry Supplies`;
    menuLoaded = false;
    hideBody = false;
    productsLoaded = false;
    categories = [];
    selectedCategory = null;
    selectedProduct = Product;
    breadcrumbCategories = [];
    products = [];
    APIError = [];

    constructor(
        private _productService: ProductService,
        private _categoryService: CategoryService
    ) {

    }

    getProducts(categoryId = 0) {
        var payload = {
            order           : 'asc',
            order_by        : 'title',
            category_id     : categoryId,
            resize          : true,
            imgHeight       : 200,
            imgWidth        : 200
        };

        this._productService.getProducts(payload)
            .subscribe(
                products => {this.products = products},
                error    => {this.APIError = error},
                ()       => {this.productsLoaded = true}
            );
    }

    getCategories() {
        this.productsLoaded = false;
        this._categoryService.getCategories({
            order           : 'asc',
            order_by        : 'name',
            parent_id       : 0,
            //sub_cats        : true,
            //group_by_parent : true
        })
            .subscribe(
                categories => {this.categories = categories},
                error      => {this.APIError = error},
                ()         => {
                    this.menuLoaded = true,
                        this.productsLoaded = true
                }
            );
    }

    selectCategory(category: Category) {
        this.selectedCategory = category;
        this.breadcrumbCategories.push(category);
    }
    resetFilters() {
        this.getProducts();
        this.getCategories();
        this.selectedCategory = null;
        this.selectedProduct = null;
    }
    private changeCategory(category: Category):void {
        this.productsLoaded = false;
        this.selectCategory(category);
        this.getProducts(category.id);
    }

    ngOnInit() {
        this.getCategories();
        this.getProducts();
    }
}

product.component.ts

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

import { Product } from "../classes/Product";
import { Category } from "../classes/Category";
import { ProductService } from "../services/product.service";

@Component({
    selector: 'product-view',
    templateUrl: './app/views/product-view.html'
})

export class ProductComponent {
    @Input() products: Product[];
    @Input() selectedCategory: Category;
    selectedProduct: Product;
    contentLoaded = false;
    title = "product viewer";
    APIError = [];

    constructor(
        private _productService: ProductService
    ) {
        _productService.emitter.subscribe(
            product  => {
                this.selectedProduct = product;
                this.contentLoaded = true
            }
        );
    }

    selectProduct(product) {
        this.selectedProduct = product;
        this._productService.emitProduct(this.selectedProduct);
    }

    ngAfterContentInit() {
        this.contentLoaded = true;
    }

    private changeSelectedProduct(product, callback) {
        this.selectedProduct = product;
    }
}

以前這沒有問題，我對為什麼會出現這個錯誤感到困惑。有人能指引我正確的方向嗎？

謝謝

答案＃1

你要麼需要使 ProductComponent、OverlayComponent 的選擇器更具特異性，以免兩者都被應用，要麼將你的應用程式拆分成幾個模組，這樣你只會註冊那些應該實際應用於當前模組模板的 declarations。

如果您只有一個模組，那麼所有 directives 的元件、指令和管道都會套用到所有元件。

答案＃2

我遇到了這個問題，而我的問題是 templateURL 與 HTML 檔案的檔案名稱不匹配。