How to extend ASP.Net Web Forms app adding Blazor?

Question

We have a large legacy web forms application. We would like to continue to extend the functionality of it (add new pages). But we would like to stop adding more Web Forms code and instead would like to use Blazor to develop all new features going forward.

Ideally, a link from a Web Form page would redirect the browser to a page served by a Blazor app and vice-versa and the transition would be indistinguishable to the user.

Is this possible? If yes, how can it be done?

Also, what about authentication? Ideally, the user would login in our existing Web Form app and would not need to login again when transitioning to the Blazor app.

Seconding Henk, you are looking for single signon. Look OAuth / openId or SAML. Essentially you would have two applications, but you would be able to automatically sign users into your blazor app from your web forms app. — Kyle
– Kyle, Commented Jan 15, 2020 at 23:41

Flores · Accepted Answer · 2020-01-16 13:23:11Z

1

What I did:

Host the blazor application in a subfolder under the existing app:

myapp.com/oldapp

myapp.com/oldapp/blazor

You can just add links between them, If you use the same layout users should not notice.

Now because you are using the same hostname, you can issue a cookie with a JWT token on login in the old app, and because the new app runs on the same hostname the blazor app can pickup this cookie and use the token to do requests to a new backend API that is also using JWT auth.

answered Jan 16, 2020 at 13:23

Flores

8,9905 gold badges54 silver badges85 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Flores Over a year ago

This was Blazor Wasm. The cookie does not need to be compatible, it just holds the JTW token, and is picked up in the blazor part.

gabriel290687 Over a year ago

I'm trying to host a Blazor app in a subfolder under an existing Web Forms app, can you please point me into the right direction with any resource? I've tried multiple things but I just can't, I'm new with Blazor and I haven't worked with Web Forms before

Flores Over a year ago

Host and deploy section here: learn.microsoft.com/en-us/aspnet/core/blazor/host-and-deploy

Collectives™ on Stack Overflow

How to extend ASP.Net Web Forms app adding Blazor?

1 Answer 1

3 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related