Get current user id in startup (asp.net core 5)

Question

How I can get current user id in Configure Services method. I need to send user Id when inject some service. or it is not possible ?

Does this answer your question? [How to get current user in asp.net core](https://stackoverflow.com/questions/36641338/how-to-get-current-user-in-asp-net-core) — Alok Raj, May 31 '21 at 14:24
hi @AlokRaj . No I need to get user id in startup , not in controller — user3384879, May 31 '21 at 14:33
Did you know that startup runs only ones. Doesn' t matter how many users. — Serge, May 31 '21 at 17:22

score 1 · Accepted Answer · answered Jun 01 '21 at 04:24

I need to send user Id when inject some service. or it is not possible ?

HttpContext is only valid during a request. The ConfigureServices method in Startup is not a web call and, as such, does not have a HttpContext. So the User information also cannot be got. You need register the IHttpContextAccessor and DI it by constructor in your services. Then you could get HttpContext.User infomation successfully.

Register the IHttpContextAccessor:

services.AddScoped<IHttpContextAccessor,HttpContextAccessor>();

DI in the service:

public interface IService
{
    string GetUserId();
}

public class Service : IService
{
    private readonly IHttpContextAccessor _httpContextAccessor;
    public Service(IHttpContextAccessor httpContextAccessor)
    {
        _httpContextAccessor = httpContextAccessor;
    }
    public string GetUserId()
    {
        var id = _httpContextAccessor.HttpContext.User.FindFirst(ClaimTypes.NameIdentifier).Value;
        return id;
    }
}

Register the service:

services.AddScoped<IHttpContextAccessor,HttpContextAccessor>();
services.AddScoped<IService, Service>(); //add this...

More explanations you could refer to here.

Get current user id in startup (asp.net core 5)

1 Answers1