GetCurrentApplicationUserName.cs

using Microsoft.AspNetCore.Http;
using PregnancyStudy.Services;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Claims;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Identity;

namespace Study.Web.Services
{
    public class GetCurrentApplicationUserName : IGetCurrentApplicationUserName
    {
        readonly IHttpContextAccessor contextAccessor;

        public GetCurrentApplicationUserName(IHttpContextAccessor contextAccessor)
        {
            this.contextAccessor = contextAccessor;
        }

        string IGetCurrentApplicationUserName.GetCurrentApplicationUserName()
        {
            var email = contextAccessor.HttpContext?.User?.Claims?.FirstOrDefault(c => c.Type == "sub")?.Value;
            var userId = contextAccessor.HttpContext?.User?.FindFirst(ClaimTypes.NameIdentifier).Value;
            return contextAccessor.HttpContext?.User?.Identity?.Name;
        }
    }
}