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 .NET Core->ASP.NET Core-Web 应用程序，这导致了一个包含 Angular4 示例的项目申请。
运行此应用程序完全没有问题，当我尝试使用此应用程序继续使用 Angular 5(5.0.1 或 5.0.0，无关紧要)时，问题就开始了。
完成所有必要步骤后，应用程序在 Debug模式下运行良好。但是尝试在 Release 中构建和启动它(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 所做的是: 将所有 Angular 模块的 package.json 中的版本更改为 5.0.1，同时将 typescript、rxjs、angular/cli 和 @ngtools/webpack (1.5.0 -> 1.8.0) 更改为更新版本 所以我的新 package.json 看起来像这样:
{
"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 安装，然后使用 --env.prod 开关运行 webpack)时，我得到上面的堆栈跟踪。当我将应用程序部署到 Azure 时，也会发生同样的事情。
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，应用程序会突然运行。这在 Azure 上不起作用，这对我来说有点奇怪。
您对我可能做错了什么或遗漏了什么有什么建议吗？
最佳答案
几天来我遇到了同样的问题，我在 GitHub 中找到了一个 VS2017 - Angular 5 项目(没有确切的 URL)，我从中复制了 webpack.config.js 我也更新了我的 Angular 到 5.0.3 我运行了有效的“dotnet publish”(或“dotnet publish -c Release”) 我面临(并且仍然面临)的唯一问题是在复杂化期间，编译器弄乱了 main-server.js，因此作为一种解决方法，我在复杂化之前复制了 main-server.js(10MB 对 2MB)。 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 - 除了对 webpack.config.js 进行更改外，我还进行了以下两项更改，解决了我的问题!: 在 index.cshtml 中: 改变自
<app asp-prerender-module="ClientApp/dist/main-server">Loading...</app>
到:
<app>Loading...</app>
在 boot.server.ts 中: 更改自:
const zone = moduleRef.injector.get(NgZone);
到:
const zone: NgZone = moduleRef.injector.get(NgZone);
阅读http://www.talkingdotnet.com/upgrade-angular-4-app-angular-5-visual-studio-2017/了解更多信息。
关于asp.net - Angular 5/ASP.NET - “No ResourceLoader implementation has been provided. Can' t 读取 URL”，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/47303692/