ASP.NET Core 2.2 get userId in DbContext

Question

I am quite new to ASP.NET Core. I want to create ASP.NET Core 2.2 WebAPI, with Entity Framework Core and ASP.NET Identity. Also, I want to use JWT to secure access to that WebAPI with tokens.

I have successfully managed to insert user to DB and to get token back from my API, and token auth is working.

But, I also want to soft delete database records and to keep track on who has deleted/updated/added a record. Test table for that is Countries, where fields are only Title and Description .

So far, I have turned Internet upside-down, but no help :(

Las thing that I have tried is (userId is null ):

• In startup.cs:

   services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>(); 

• in my AppDbContext.cs

   public class AppDbContext : IdentityDbContext<AppUser>{ public AppDbContext(DbContextOptions options) : base(options) { } public DbSet<AppUser> AppUsers { get; set; } public DbSet<Country> Countries { get; set; } // just for testing protected override void OnModelCreating(ModelBuilder builder) { base.OnModelCreating(builder); // TODO - IGNORE THIS //builder.Entity<AppUser>().Property<bool>("IsDeleted"); //builder.Entity<AppUser>().HasQueryFilter(m => EF.Property<bool>(m, "IsDeleted") == false); } public override async Task<int> SaveChangesAsync(CancellationToken cancellationToken = default(CancellationToken)) { CheckBeforeSaving(); return (await base.SaveChangesAsync(true, cancellationToken).ConfigureAwait(false)); } private void CheckBeforeSaving() { var httpContextAccessor = this.GetService<IHttpContextAccessor>(); var userId = httpContextAccessor?.HttpContext.User.FindFirstValue(ClaimTypes.NameIdentifier); foreach (var entry in ChangeTracker.Entries()) { switch (entry.State) { case EntityState.Detached: break; case EntityState.Unchanged: break; case EntityState.Deleted: entry.State = EntityState.Modified; entry.CurrentValues["IsDeleted"] = true; entry.CurrentValues["DeletedBy"] = userId; entry.CurrentValues["Deleted"] = DateTime.Now; break; case EntityState.Modified: entry.CurrentValues["UpdatedBy"] = userId; entry.CurrentValues["Updated"] = DateTime.Now; break; case EntityState.Added: entry.CurrentValues["IsDeleted"] = false; entry.CurrentValues["CreatedBy"] = userId; entry.CurrentValues["Created"] = DateTime.Now; entry.CurrentValues["Description"] = userId; break; default: break; } } }}} 

Answer 1

Here is how I'm getting user id in .net core 2.2

First you need to register in your Startup.cs

services.AddSingleton<IActionContextAccessor, ActionContextAccessor>();

Then in your service

private readonly IHttpContextAccessor _httpContextAccessor;

public UserService(
    IHttpContextAccessor httpContextAccessor)
{

}

var currentUserGuid = _httpContextAccessor?.HttpContext?.User?.FindFirst(UserClaimsKey.Sub)?.Value;

Answer 2

Try to inject IHttpContextAccessor into the ApplicationDbContext directly:

public class ApplicationDbContext : IdentityDbContext<AppUser>
{
    private readonly IHttpContextAccessor _httpContextAccessor;
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options, IHttpContextAccessor httpContextAccessor)
        : base(options)
    {
        _httpContextAccessor= httpContextAccessor;
    }

    //other methods

   private void CheckBeforeSaving()
   {        
     var userId = _httpContextAccessor?.HttpContext.User.FindFirstValue(ClaimTypes.NameIdentifier);
     //...
   }
}

Answer 3

private async Task<ApplicationUser> GetUserDetailsAnsyc()
{
  return await userManager.GetUserAnsync(HttpContext.User);
}

var user = await GetUserDetailsAnsyc();
Console.WriteLine(user.Id.ToString());