Save a value in authentication cookie when calling SignInAsync

Question

I have a Login Page with three fields Username, Password and a dropdown list. The User is supposed to a select a value from dropdown list before signing.

I need to store the selected value of dropdown list in the Authentication Cookie and Able to Retrieve it on further requests.

Using AspNetCore Identity 2.0.0 for authentication.

Answer 1

You can read up on how to do this on https://learn.microsoft.com/en-us/aspnet/core/security/authentication/cookie?tabs=aspnetcore2x

//somehow authenticate your user. I don't care how you do this.
var user = await AuthenticateUser(Input.Email, Input.Password);

//create a list of claims - all you need based on your user information
//this si also where you store the information based on your ddl value
var claims = new List<Claim>
{
    new Claim(ClaimTypes.Name, user.Email),
    new Claim("FullName", user.FullName),
    new Claim("DropdownValue", /*ADD DROPDOWN VALUE HERE*/)
};

var claimsIdentity = new ClaimsIdentity(
    claims, CookieAuthenticationDefaults.AuthenticationScheme);

var authProperties = new AuthenticationProperties();


await HttpContext.SignInAsync(
      CookieAuthenticationDefaults.AuthenticationScheme, 
      new ClaimsPrincipal(claimsIdentity), 
      authProperties);

Eh voila. Done.