Upgrade from Angular 4 to 5: “NodeInvocationExcept

问题:

I've upgraded an app from Angular 4.2 to 5, but got this error: unhandled exception occurred while processing the request, more specifically:

NodeInvocationException: No provider for PlatformRef! Error: No provider for PlatformRef! at injectionError (e:\myapp\ClientApp\dist\vendor.js:12066:90)

The app also uses webpack and ASP.NET Core.

I have installed node v9.1, and typescript 2.6.1.

I also have updated package.json, with the command:

npm install @angular/common@latest @angular/compiler@latest @angular/compiler-cli@latest @angular/core@latest @angular/forms@latest @angular/http@latest @angular/platform-browser@latest @angular/platform-browser-dynamic@latest @angular/platform-server@latest @angular/router@latest @angular/animations@latest typescript@latest 

And afterwards, ran the following:

 npm install --save-dev @ngtools/webpack@latest

I've also used HttpClient instead of Http:

import { HttpClient } from '@angular/common/http'; 
.....
 getThings() {
        return this.http.get('/api/things');

  }

If I downgrade back Angular 4, the app works fine, is there anything in my line of thought that has been done incorrectly?

回答1:

I found a solving solution: I've used this Angular 5 Asp Core template

I've updated dependecies to latest angular 5 version: npm install @angular/common@latest @angular/compiler@latest @angular/compiler-cli@latest @angular/core@latest @angular/forms@latest @angular/http@latest @angular/platform-browser@latest @angular/platform-browser-dynamic@latest @angular/platform-server@latest @angular/router@latest @angular/animations@latest typescript@latest

npm install --save-dev @ngtools/webpack@latest

I've recompiled webpack --config webpack.config.vendor.js (must have webpack installed globally: npm install -g webpack@2.5.1)

I've replaced ClientApp/ASP files with my project files Manully changed in app.module:

import { HttpModule } from '@angular/http';

to

import { HttpClientModule } from '@angular/common/http';

in services files instead of Http I've used HttpClient:

import { HttpClient } from '@angular/common/http'; 

回答2:

Two different things, which you can try:

1) import HttpClientModule at your NgModule's import array first.(If you are using HttpClient in your component)

2) https://stackoverflow.com/a/39206501/2810015

Note: to upgrade your application : https://onlyforcoder.blogspot.in/2017/11/angular-5-upgrade-your-project-To-Angular5.html