That Saar 💎
#30MinsLearning Day 12, in the code implementation, this Context.SignInAsync() method got me confused for quite a while. Firstly, there's no SignInAsync() method on HttpContext class: learn.microsoft.com/en-us/dotnet... ...
Bluesky

Bluesky Social
Mar 11, 2025 at 5:01pmWeb
Show threadThat Saar 💎Mar 11, 2025
Digging a bit, there's actually an extension method described here: learn.microsoft.com/en-us/dotnet.... Good, what does that actually do?
AuthenticationHttpContextExtensions.SignInAsync Method (Microsoft.AspNetCore.Authentication)

Sign in a principal for the default authentication scheme. The default scheme for signing in can be configured using DefaultSignInScheme.

Show threadThat Saar 💎Mar 11, 2025
Time to dig out the .net source: source.dot.net/Microsoft.As... It calls GetAuthenticationService and then calls SignInAsync on that. Right, what does GetAuthenticationService mean?
SignInAsync

Show threadThat Saar 💎Mar 11, 2025
Well, it gets the service of IAuthenticationService from the IoC container. That means, some code is registering IAuthenticationService, and what is that? 🤔
Show threadThat Saar 💎Mar 11, 2025
In ASP.NET Core Identity, the `AddDefaultIdentity<TUser>` looks ... suspecious because it calls `AddAuthentication()` for us.
Show threadThat Saar 💎Mar 11, 2025
Follow the lead, the AddAuthentication calls AddAuthenticationCore():
Show threadThat Saar 💎Mar 11, 2025
And then it registers AuthenthicationServiceImpl as IAuthenticationService:
Show threadThat Saar 💎Mar 11, 2025
Okay, cool. But what does it do? Let's find out together the next time 😁