ASP.Net Core 2 如何在身份验证后触发/调用代码

Question

How can I trigger some code right after authentication? Let's say I want to give my application a single session constraint per user, for example. How can I implement it in ASP.Net Core 2.0?

Update:

Clarification, I want to trigger code right after a user is considered authenticated (after .net authentication middleware have validated the user is who claims to be). I have not mentioned Middleware before because there might be an easier way, like an event, to trigger some code. Maybe the proper question would be if is there such event/way, or if I should manage it through a custom Middleware attached right after Authentication?

Answer 1

The simplest scenario, is calling the method you want in any action in MVC controller. Actions are always called after authentication (I think this is not what you need, but the information your provided are very poor, as you did not mentioned exactly what do you mean by right after authentication ).

The other possiblity ( which is probably what you want ), is to create a middleware , and add it to the pipeline exactly after authentication middleware. When you have your middleware in the pipeline, you can write to do what ever you want.

Middleware writing is well documented here:

https://docs.microsoft.com/en-us/aspnet/core/fundamentals/middleware?tabs=aspnetcore2x