angular - 空注入(inject)器错误 : No provider for ViewportScroller

Question

我正在构建一个简单的 Angular 应用程序，使用 Angular Material 来设计前端。该应用程序只有 2 个组件呈现在同一页面中。当我为应用程序提供服务时，在控制台中返回:

NullInjectorError: "StaticInjectorError(AppModule)[RouterScroller -> ViewportScroller]: StaticInjectorError(平台:核心)[RouterScroller -> ViewportScroller]: NullInjectorError:没有 ViewportScroller 的提供者!”

AppModule.ts

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

      import { AppRoutingModule } from './app-routing.module';
      import { AppComponent } from './app.component';
      import { Material } from './Material';
      import { DataFormComponent } from './data-form/data-form.component';
      import { TemplateFormComponent } from './template-form/template-form.component';
      import { FormsModule } from '@angular/forms';


      @NgModule({
        declarations: [
          AppComponent,
          DataFormComponent,
          TemplateFormComponent,
        ],
        imports: [
          BrowserModule,
          AppRoutingModule,
          Material,
          FormsModule
        ],
        providers: [],
        bootstrap: [AppComponent]
      })
      export class AppModule { }

应用组件.ts

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

Material.ts(所有 Angular Material 组件的模块)

                import {BrowserAnimationsModule} from '@angular/platform-browser/animations';
            import {NgModule} from '@angular/core';
            import {MatTabsModule} from '@angular/material/tabs';
            import {MatInputModule} from '@angular/material';
            import {MatCardModule} from '@angular/material/card';
            import {MatToolbarModule} from '@angular/material/toolbar';
            import {MatFormFieldModule} from '@angular/material/form-field';
            import {MatButtonModule} from '@angular/material/button';

            @NgModule({
                imports:
                [
                    BrowserAnimationsModule,
                    MatTabsModule,
                    MatCardModule,
                    MatToolbarModule,
                    MatFormFieldModule,
                    MatInputModule,
                    MatButtonModule
                ],
                exports:
                [
                    BrowserAnimationsModule,
                    MatTabsModule,
                    MatCardModule,
                    MatToolbarModule,
                    MatFormFieldModule,
                    MatInputModule,
                    MatButtonModule
                ],
            })
            export class Material { }

            @Component({
              selector: 'app-root',
              templateUrl: './app.component.html',
              styleUrls: ['./app.component.css']
            })
            export class AppComponent {
              title = 'forms';
            }

AppRoutingModule.ts:

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { CursoModule } from './curso/curso.module';

const routes: Routes = [
 { 
  path: '', pathMatch: 'full', redirectTo: 'curso'
 },
 { 
  path: 'curso', loadChildren: './curso/curso.module#CursoModule'
  }
];

@NgModule({
 imports: [RouterModule.forRoot(routes)],
 exports: [RouterModule]
})
export class AppRoutingModule { }

cursp-routing.module.ts:

import { CursosComponent } from './cursos.component';
import { RouterModule } from '@angular/router';
import { NgModule } from '@angular/core';
import { CursoListaComponent } from './curso-lista/curso-lista.component';

    const routes = [
    {
        path: '', component: CursoListaComponent
    }
    ]


 @NgModule({
  imports: [RouterModule.forChild(routes)],
  exports: [RouterModule]
 })
 export class CursoRouting { }

Answer 1

我有同样的错误 - 在项目中更新 Angular 对我有用(这是一个只有 Angular Material、几个简单组件和简单路由的新项目)。

ng update @angular/cli @angular/core

https://update.angular.io/#7.2:8.0

我做后出现的错误:

npm install -S @angular/material @angular/cdk @angular/animations
npm uninstall @angular/core
npm install -S @angular/core

作为错误的解决方案“在'@angular/core'中找不到导出'ɵɵinject'(在将Angular Material添加到全新项目后抛出)。

它一直有效，直到我添加路由并得到 NullInjectorError: No provider for ViewportScroller。但正如开头所述 - 将整个项目更新为 Angular v8 似乎是解决方案。