Understanding UserManager<IdentityUser> and UserManager<IdentityUser>

Question

How do I get the values of the following objects:

UserManager<IdentityUser> userManager,
SignInManager<IdentityUser> signInManager,
IConfiguration configuration

I need userManager, signInManager, and configuration to call a method inside of a controller. The above parameters are part of the constructor.

How can I accomplish this?

Answer 1

Hi @lesponce ,

The UserManager, SignInManager and the RoleManager are the Asp.net core Identity build in class, and they provide the related methods to manage user and role.

After configuring Identity services in the Program.cs (Asp.net 6) or Startup.cs (Asp.net core 1~3 and Asp.net 5), like this (the following sample code apply to asp.net 6 web application):

//get the connctionstring via Configuration  
var connectionString = builder.Configuration.GetConnectionString("DefaultConnection");  
  
//register database and DBcontext  
builder.Services.AddDbContext<ApplicationDbContext>(options =>  
    options.UseSqlServer(connectionString));  
builder.Services.AddDatabaseDeveloperPageExceptionFilter();  
//register the Identity service  
builder.Services.AddDefaultIdentity<IdentityUser>(options => options.SignIn.RequireConfirmedAccount = true)  
    .AddRoles<IdentityRole>()  //add the role service.  
    .AddEntityFrameworkStores<ApplicationDbContext>();  

Then, in the MVC controller or Razor page, we could use the constructor injection method to inject the UserManager, SignInManager and IConfiguration, and then use them like this:

public class AccountController : Controller  
{  
    private readonly IConfiguration _config;  
    private readonly UserManager<IdentityUser> _userManager;  
    public AccountController(IConfiguration configuration,   
        UserManager<IdentityUser> userManager)  
    {  
        _config = configuration;  
        _userManager = userManager;  
    }  

    public IActionResult Index()  
    {  
        var connectionstring = _config.GetConnectionString("DefaultConnection");  

        var user = _userManager.FindByNameAsync(User.Identity.Name);  

        return View();  
    }  

The screenshot as below:

More detail information about using Asp.net core Identity, see Introduction to Identity on ASP.NET Core and Scaffold Identity in ASP.NET Core projects.

To the use of IConfiguration, you can refer to Configuration in ASP.NET Core.

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Best regards,
Dillion