SignOutAsync should take [] of AuthenticationSchemes

[aspnet-hello]

From @Tratcher on Monday, March 14, 2016 3:28:57 PM

From @rustd on March 14, 2016 22:22

A user has to specify SignOut per authentication scheme as follows https://github.com/aspnet/Templates/blob/dev/src/Rules/StarterWeb/OrganizationalAuth/Single/Controllers/AccountController.cs#L24
With this change we will have the same code as in Katana

Copied from original issue: aspnet/Security#742

Copied from original issue: aspnet/HttpAbstractions#585

[aspnet-hello]

From @Tratcher on Monday, March 14, 2016 3:31:32 PM

I don't think we need this, we had considered it as an intermediate design that didn't provide AuthProperties but opted for aspnet/Security#743 instead.

[aspnet-hello]

From @PinpointTownes on Monday, March 14, 2016 6:03:24 PM

The syntax in MVC would be much better if aspnet/Mvc#4259 was merged.

/cc @danroth27

[aspnet-hello]

From @Tratcher on Saturday, July 8, 2017 9:14:53 PM

@HaoK is this still relevant or can we close it? It looks like MVC is doing most of the work for us.

[HaoK]

Yeah we can close, MVC has a SignOut result that takes a list of schemes. Its not very common to sign out multiple schemes at once anyways...