如何从非控制器类中的Microsoft.AspNetCore.Identity获取UserID

Question

Hoping someone can help me out here. I'm new to ASP, MVC and C# but trying to build a web application to learn it. I've created the default application that creates all the controllers, views etc for users and all works well.

I've now created a class and inside that class, I need to get the userID or user name of the logged in user. I've tried injecting UserManager and SignInManager into the constructor of the class but then any controllers calling that call complain that I'm not passing in the required parameters.

This may be cheeky but if someone has a basic example of how to retrieve something like the userID from inside a class, I could probably work backwards and understand what's going on. Been searching for hours on line but can't find any examples that work.

Using VS 2015 Asp Core Net RC2

Thanks

Answer 1

The user id exists in the HttpContext . Identity just adds helpers, but you still need the HttpContext instance, which you won't have outside of a controller. This would seem to be a prime example of an XY problem, where you're asking how to do something to solve a problem in a certain way you've decided to approach it rather than asking about how to solve the problem itself. Generally speaking, if you need the user id outside of the controller, you should simply pass the literal user id from the controller to whatever you're calling into, rather than trying to retrieve it from there.

Answer 2

This worked for me

Check Inside Services section of this article, to see how to get instance of HttpContextAccessor (eg _httpContextAccessor )

Then you may get the user id just like this:

long userId = ClaimsPrincipalExtensions.GetUserId(_httpContextAccessor.HttpContext.User);

Assuming that you have already written the method ClaimsPrincipalExtensions.GetUserId , if you didn't, just check this .