Angular 5/ASP.NET -“没有提供ResourceLoader实现。无法读取URL“

Question

我正在尝试在Visual Studio 2017上构建一个新的Angular5/ASP.NET SPA。因此，我使用Angular创建了一个ASP.NETCore-> .NET Core-Web应用程序，从而生成了一个包含Angular4示例应用程序的项目。

运行这个应用程序是完全没有问题的，当我尝试使用这个应用程序运行Angular 5 (5.0.1或5.0.0，无关紧要)时，问题就开始了。

完成所有必要的步骤后，应用程序将在调试模式下正常运行。但尝试在发行版中构建并启动它(或将其部署到azure)会导致以下错误：

An unhandled exception occurred while processing the request.

NodeInvocationException: No ResourceLoader implementation has been provided. Can't read the url "app.component.html"
Error: No ResourceLoader implementation has been provided. Can't read the url "app.component.html"
at Object.get (E:\angular4_spielwiese\vs spielwiese\myAngularApp\myAngularApp\ClientApp\dist\vendor.js:98069:15)
at DirectiveNormalizer.module.exports.DirectiveNormalizer._fetch (E:\angular4_spielwiese\vs spielwiese\myAngularApp\myAngularApp\ClientApp\dist\vendor.js:44087:43)
at DirectiveNormalizer.module.exports.DirectiveNormalizer._preParseTemplate (E:\angular4_spielwiese\vs spielwiese\myAngularApp\myAngularApp\ClientApp\dist\vendor.js:44142:29)
at DirectiveNormalizer.module.exports.DirectiveNormalizer.normalizeTemplate (E:\angular4_spielwiese\vs spielwiese\myAngularApp\myAngularApp\ClientApp\dist\vendor.js:44122:36)
at CompileMetadataResolver.module.exports.CompileMetadataResolver.loadDirectiveMetadata (E:\angular4_spielwiese\vs spielwiese\myAngularApp\myAngularApp\ClientApp\dist\vendor.js:55794:75)
at E:\angular4_spielwiese\vs spielwiese\myAngularApp\myAngularApp\ClientApp\dist\vendor.js:74510:72
at Array.forEach (native)
at E:\angular4_spielwiese\vs spielwiese\myAngularApp\myAngularApp\ClientApp\dist\vendor.js:74509:72
at Array.forEach (native)
at JitCompiler.module.exports.JitCompiler._loadModules (E:\angular4_spielwiese\vs spielwiese\myAngularApp\myAngularApp\ClientApp\dist\vendor.js:74506:75)
Microsoft.AspNetCore.NodeServices.HostingModels.HttpNodeInstance+<InvokeExportAsync>d__7.MoveNext()

我为迁移到Angular5所做的事情是:将所有angular-Module的package.json版本改为5.0.1，同时将typescript、rxjs、angular/cli和@ngtools/webpack (1.5.0 -> 1.8.0)的版本改为较新的版本，因此我的新package.json如下所示：

{
  "name": "myAngularApp",
  "private": true,
  "version": "0.0.0",
  "scripts": {
    "test": "karma start ClientApp/test/karma.conf.js"
  },
  "dependencies": {
    "@angular/animations": "^5.0.1",
    "@angular/common": "^5.0.1",
    "@angular/compiler": "^5.0.1",
    "@angular/core": "^5.0.1",
    "@angular/forms": "^5.0.1",
    "@angular/http": "^5.0.1",
    "@angular/platform-browser": "^5.0.1",
    "@angular/platform-browser-dynamic": "^5.0.1",
    "@angular/platform-server": "^5.0.1",
    "@angular/router": "^5.0.1",
    "@types/webpack-env": "^1.13.0",
    "angular2-template-loader": "^0.6.2",
    "aspnet-prerendering": "^3.0.1",
    "aspnet-webpack": "^2.0.1",
    "awesome-typescript-loader": "^3.2.1",
    "bootstrap": "^3.3.7",
    "css": "^2.2.1",
    "css-loader": "^0.28.7",
    "es6-shim": "^0.35.3",
    "event-source-polyfill": "0.0.9",
    "expose-loader": "^0.7.3",
    "extract-text-webpack-plugin": "^3.0.2",
    "file-loader": "^1.1.5",
    "html-loader": "^0.5.1",
    "html-webpack-plugin": "^2.30.1",
    "isomorphic-fetch": "^2.2.1",
    "jquery": "^3.2.1",
    "json-loader": "^0.5.4",
    "preboot": "^5.1.7",
    "raw-loader": "^0.5.1",
    "reflect-metadata": "^0.1.10",
    "rxjs": "^5.5.2",
    "style-loader": "^0.19.0",
    "to-string-loader": "^1.1.5",
    "typescript": "^2.6.1",
    "zone.js": "^0.8.18"
  },
  "devDependencies": {
    "@angular/cli": "1.5.0",
    "@angular/compiler-cli": "^5.0.1",
    "@ngtools/webpack": "1.8.0",
    "@types/chai": "4.0.1",
    "@types/jasmine": "2.6.3",
    "chai": "4.0.2",
    "jasmine-core": "2.6.4",
    "karma": "1.7.0",
    "karma-chai": "0.1.0",
    "karma-chrome-launcher": "2.2.0",
    "karma-cli": "1.0.1",
    "karma-jasmine": "1.1.0",
    "karma-webpack": "2.0.3",
    "url-loader": "0.6.2",
    "webpack": "3.8.1",
    "webpack-hot-middleware": "2.20.0",
    "webpack-merge": "4.1.1"
  }
}

然后我将webpack.config.js中的AotPlugin更改为AngularCompilerPlugin，这是我的webpack.config.js：

const path = require('path');
const webpack = require('webpack');
const merge = require('webpack-merge');
const AngularCompilerPlugin = require('@ngtools/webpack').AngularCompilerPlugin;
const CheckerPlugin = require('awesome-typescript-loader').CheckerPlugin;

module.exports = (env) => {
    // Configuration in common to both client-side and server-side bundles
    const isDevBuild = !(env && env.prod);
    const sharedConfig = {
        stats: { modules: false },
        context: __dirname,
        resolve: { extensions: [ '.js', '.ts' ] },
        output: {
            filename: '[name].js',
            publicPath: 'dist/' // Webpack dev middleware, if enabled, handles requests for this URL prefix
        },
        module: {
            rules: [
                { test: /\.ts$/, include: /ClientApp/, use: isDevBuild ? ['awesome-typescript-loader?silent=true', 'angular2-template-loader'] : ['awesome-typescript-loader?silent=true', 'angular2-template-loader'] },// '@ngtools/webpack' },
                { test: /\.html$/, use: 'html-loader?minimize=false' },
                { test: /\.css$/, use: [ 'to-string-loader', isDevBuild ? 'css-loader' : 'css-loader?minimize' ] },
                { test: /\.(png|jpg|jpeg|gif|svg)$/, use: 'url-loader?limit=25000' }
            ]
        },
        plugins: [new CheckerPlugin()]
    };

    // Configuration for client-side bundle suitable for running in browsers
    const clientBundleOutputDir = './wwwroot/dist';
    const clientBundleConfig = merge(sharedConfig, {
        entry: { 'main-client': './ClientApp/boot.browser.ts' },
        output: { path: path.join(__dirname, clientBundleOutputDir) },
        plugins: [
            new webpack.DllReferencePlugin({
                context: __dirname,
                manifest: require('./wwwroot/dist/vendor-manifest.json')
            })
        ].concat(isDevBuild ? [
            // Plugins that apply in development builds only
            new webpack.SourceMapDevToolPlugin({
                filename: '[file].map', // Remove this line if you prefer inline source maps
                moduleFilenameTemplate: path.relative(clientBundleOutputDir, '[resourcePath]') // Point sourcemap entries to the original file locations on disk
            })
        ] : [
            // Plugins that apply in production builds only
            new webpack.optimize.UglifyJsPlugin(),
            new AngularCompilerPlugin({
                tsConfigPath: './tsconfig.json',
                entryModule: path.join(__dirname, 'ClientApp/app/app.module.browser#AppModule'),
                exclude: ['./**/*.server.ts']
            })
        ])
    });

    // Configuration for server-side (prerendering) bundle suitable for running in Node
    const serverBundleConfig = merge(sharedConfig, {
        resolve: { mainFields: ['main'] },
        entry: { 'main-server': './ClientApp/boot.server.ts' },
        plugins: [
            new webpack.DllReferencePlugin({
                context: __dirname,
                manifest: require('./ClientApp/dist/vendor-manifest.json'),
                sourceType: 'commonjs2',
                name: './vendor'
            })
        ].concat(isDevBuild ? [] : [
            // Plugins that apply in production builds only
            new AngularCompilerPlugin({
                tsConfigPath: './tsconfig.json',
                entryModule: path.join(__dirname, 'ClientApp/app/app.module.server#AppModule'),
                exclude: ['./**/*.browser.ts']
            })
        ]),
        output: {
            libraryTarget: 'commonjs',
            path: path.join(__dirname, './ClientApp/dist')
        },
        target: 'node',
        devtool: 'inline-source-map'
    });

    return [clientBundleConfig, serverBundleConfig];
};

当我现在使用VS2017中的Release-config启动应用程序(执行npm install，然后使用--env.prod开关运行webpack )时，我得到了上面的堆栈跟踪。当我将应用程序部署到Azure时，同样的事情也会发生。

在本地主机上，如果我等待几秒钟并强制重新加载我的浏览器，应用程序就会突然工作。这在Azure上不起作用，这对我来说有点奇怪。

你有什么建议吗，我可能做错了什么，或者我遗漏了什么？

Answer 1

我有几天相同的问题，我找到了一个VS2017 - Angular 5项目在GitHub (没有确切的网址)，我已经从它复制了webpack.config.js我也更新了我的角度到5.0.3我运行了'dotnet发布‘工作(或'dotnet发布-c版本’)我面临的唯一问题(仍然面临)是在复杂期间，编译器搞乱了VS2017-server.js，所以作为一个变通办法，我在复杂之前复制了main-server.js (10MB vs 2MB)。当运行'dotnet mydll.dll‘时-效果很好。

webpack.config.js：

/*
 * Webpack (JavaScriptServices) with a few changes & updates
 * - This is to keep us inline with JSServices, and help those using that template to add things from this one
 *
 * Things updated or changed:
 * module -> rules []
 *    .ts$ test : Added 'angular2-router-loader' for lazy-loading in development
 *    added ...sharedModuleRules (for scss & font-awesome loaders)
 */

const path = require('path');
const webpack = require('webpack');
const merge = require('webpack-merge');
const AngularCompilerPlugin = require('@ngtools/webpack').AngularCompilerPlugin;
const CheckerPlugin = require('awesome-typescript-loader').CheckerPlugin;
//const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;

module.exports = (env) => {
    // Configuration in common to both client-side and server-side bundles
    const isDevBuild = !(env && env.prod);
    const sharedConfig = {
        stats: { modules: false },
        context: __dirname,
        resolve: { extensions: ['.js', '.ts'] },
        output: {
            filename: '[name].js',
            publicPath: 'dist/' // Webpack dev middleware, if enabled, handles requests for this URL prefix
        },
        module: {
            rules: [
                { test: /\.ts$/, use: isDevBuild ? ['awesome-typescript-loader?silent=true', 'angular2-template-loader', 'angular2-router-loader'] : '@ngtools/webpack' },
                { test: /\.html$/, use: 'html-loader?minimize=false' },
                { test: /\.css$/, use: ['to-string-loader', isDevBuild ? 'css-loader' : 'css-loader?minimize'] },
                { test: /\.(png|jpg|jpeg|gif|svg)$/, use: 'url-loader?limit=25000' }            ]
        },
        plugins: [new CheckerPlugin()]
    };

    // Configuration for client-side bundle suitable for running in browsers
    const clientBundleOutputDir = './wwwroot/dist';
    const clientBundleConfig = merge(sharedConfig, {
        entry: { 'main-client': './ClientApp/boot.browser.ts' },
        output: { path: path.join(__dirname, clientBundleOutputDir) },
        plugins: [
            new webpack.DllReferencePlugin({
                context: __dirname,
                manifest: require('./wwwroot/dist/vendor-manifest.json')
            })
        ].concat(isDevBuild ? [
            // Plugins that apply in development builds only
            new webpack.SourceMapDevToolPlugin({
                filename: '[file].map', // Remove this line if you prefer inline source maps
                moduleFilenameTemplate: path.relative(clientBundleOutputDir, '[resourcePath]') // Point sourcemap entries to the original file locations on disk
            })
        ] : [
                // new BundleAnalyzerPlugin(),
                // Plugins that apply in production builds only
                new webpack.optimize.UglifyJsPlugin(),
                new AngularCompilerPlugin({
                    tsConfigPath: './tsconfig.json',
                    entryModule: path.join(__dirname, 'ClientApp/app/app.module.browser#AppModule'),
                    exclude: ['./**/*.server.ts']
                })
            ]),
        devtool: isDevBuild ? 'cheap-eval-source-map' : false,
        node: {
            fs: "empty"
        }
    });

    // Configuration for server-side (prerendering) bundle suitable for running in Node
    const serverBundleConfig = merge(sharedConfig, {
        // resolve: { mainFields: ['main'] },
        entry: { 'main-server': './ClientApp/boot.server.ts' },
        plugins: [
            new webpack.DllReferencePlugin({
                context: __dirname,
                manifest: require('./ClientApp/dist/vendor-manifest.json'),
                sourceType: 'commonjs2',
                name: './vendor'
            }),
            new webpack.ContextReplacementPlugin(
                // fixes WARNING Critical dependency: the request of a dependency is an expression
                /(.+)?angular(\\|\/)core(.+)?/,
                path.join(__dirname, 'src'), // location of your src
                {} // a map of your routes
            ),
            new webpack.ContextReplacementPlugin(
                // fixes WARNING Critical dependency: the request of a dependency is an expression
                /(.+)?express(\\|\/)(.+)?/,
                path.join(__dirname, 'src'),
                {}
            )
        ].concat(isDevBuild ? [] : [
            new webpack.optimize.UglifyJsPlugin({
                compress: false,
                mangle: false
            }),
            // Plugins that apply in production builds only
            new AngularCompilerPlugin({
                tsConfigPath: './tsconfig.json',
                entryModule: path.join(__dirname, 'ClientApp/app/app.module.server#AppModule'),
                exclude: ['./**/*.browser.ts']
            })
        ]),
        output: {
            libraryTarget: 'commonjs',
            path: path.join(__dirname, './ClientApp/dist')
        },
        target: 'node',
        // switch to "inline-source-map" if you want to debug the TS during SSR
        devtool: isDevBuild ? 'cheap-eval-source-map' : false
    });

    return [clientBundleConfig, serverBundleConfig];
};

编辑-除了在webpack.config.js上的更改之外，我还做了以下两个更改，解决了我的问题！：在index.cshtml: change from

<app asp-prerender-module="ClientApp/dist/main-server">Loading...</app>

至：

<app>Loading...</app>

在boot.server.ts中: change from：

const zone = moduleRef.injector.get(NgZone);

至：

const zone: NgZone = moduleRef.injector.get(NgZone);

有关更多信息，请阅读http://www.talkingdotnet.com/upgrade-angular-4-app-angular-5-visual-studio-2017/。