Issue when migrate Angular 4 with system js and MVC to angular 8

问题

I am using Angular 4 with system.js with MVC. My Project structure is same as below link:

http://www.developerin.net/a/53-Programming/123-Integrate-Angular-with-ASP.NET-MVC#

Now I want to upgrade it to Angular 8. For this I used below links:

https://www.talkingdotnet.com/upgrade-angular-4-app-angular-5-visual-studio-2017/

https://update.angular.io/#4.0:8.0

But it not working for me. DO I need to add angular.json OR Do I need to remove system.js?

With System.js, Can I upgrade it to Angular 8?

PLease suggest better way.

Thanks

来源：https://stackoverflow.com/questions/59090166/issue-when-migrate-angular-4-with-system-js-and-mvc-to-angular-8