要正常工作，请在 * app.config.ts * 中提供*ComponentFactoryResolver*

import { ApplicationConfig } from '@angular/core';
import { provideRouter } from '@angular/router';

import { routes } from './app.routes';
import { provideClientHydration } from '@angular/platform-browser';
import { provideHttpClient } from '@angular/common/http';

export const appConfig: ApplicationConfig = {
  providers: [provideRouter(routes), provideClientHydration(), provideHttpClient()  // import here]
};

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关注供应商部分

我发现了问题：
降级Angular 2+组件应该在Angular 2+ main.ts文件中完成，而不是在AngularJs模块中。
您应该在引导Angular 2+之后和引导AngularJs模块之前放置所有降级。
还要确保angularjs代码的捆绑js文件放在index.html中捆绑的Angular js文件之前。
请参阅下面的降级组件部分：你的angular2+ main.ts示例：

import '@angular/compiler';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { Ng2AppModule } from './app/ng2.app.module';
import {UpgradeModule, downgradeInjectable, downgradeComponent} from '@angular/upgrade/static';
import angular from 'angular';
import {Angular2Component} from "./app/core/components/Angular2Component";

platformBrowserDynamic().bootstrapModule(Ng2AppModule).then(platformRef => {
 const upgrade = platformRef.injector.get(UpgradeModule);
 const appSettingsService = platformRef.injector.get(AppSettingsService);
 angular.module('angularjsMainModule').directive('angularJsDirective', downgradeComponent({component: Angular2Component}));

 upgrade.bootstrap(document.body, ['angularjsMainModule']); // Bootstrap AngularJS
 
}).catch(err => console.error(err));

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