_layout.cshtml not seeing object when at /Home/Index - asp.net-core-mvc

Question

I am writing an ASP.NET Core 6 MVC app.
I have an object of type UserInfo that is set (not important where).
Under Shared, my _Layout.cshtml shows the "Login ID" at the top in a menu bar.
The portion that shows this user name is in a _LogInOutPartial.cshtml
in the the partial view, I inspect the UserInfo object and set a variable displayUser accordingly: if the user object is null, I set the variable to "Guest", otherwise I pull the login id into this variable.
Code in _LogInOutPartial.cshtml is:
#model SisExtMvcAppSSO.Models.UserInfo;
#{
bool isGuest = (Model == null || !Model.IsLogged);
bool isLoggedIn = !isGuest;
string displayUser = (isGuest ? "Guest" : Model.LoginId);
}
<button class="btn btn-outline-success my-2 my-sm-0">
<i class="bi bi-person-badge"></i> #displayUser
</button>
When the object is set, if I go to some controller/action, e.g. https://some.com/myApp/Home/Claims, the login id shows fine (e.g. "mcollins") in the top menu bar.
However, if I go to https://some.com/myApp/ (or https://some.com/myApp/Home/Index or https://some.com/myApp/Home), the menu bar (_layout.cshtml) will not show the login id, instead it shows "Guest"
This is even when the /Home/Index will show the login id in its view!
The problem is, apparently, the object it is not seen in _Layout.cshtml.
But then how come it is seen in the menu bar (_Layout.cshtml) when I go to /Home/Claims?

Answer 1

Usually,we will use UserManager as the model in _LogInOutPartial.cshtml for Identity.If you don't want to use it,you can try to use Session and add the object to session in somewhere.Once the data is added,you can get it in other views.
Program.cs:
var builder = WebApplication.CreateBuilder(args);
// Add services to the container.
builder.Services.AddControllersWithViews();
builder.Services.AddDistributedMemoryCache();
builder.Services.AddSession(options =>
{
options.IdleTimeout = TimeSpan.FromDays(1);
options.Cookie.HttpOnly = true;
options.Cookie.IsEssential = true;
});
...
app.UseAuthorization();
app.UseSession();
...
partial view:
#using Microsoft.AspNetCore.Http;
#using Newtonsoft.Json;
#{
UserInfo userInfo=null;
if (!string.IsNullOrEmpty(Context.Session.GetString("userInfo")))
{
userInfo = JsonConvert.DeserializeObject<UserInfo>(Context.Session.GetString("userInfo"));
}
bool isGuest = (userInfo == null || !userInfo.IsLogged);
bool isLoggedIn = !isGuest;
string displayUser = (isGuest ? "Guest" : userInfo.LoginId);
}
<button class="btn btn-outline-success my-2 my-sm-0">
<i class="bi bi-person-badge"></i> #displayUser
</button>
Action:
public IActionResult YourAction()
{
UserInfo userInfo = new UserInfo { LoginId = "mcollins", IsLogged = true };
HttpContext.Session.SetString("userInfo", JsonConvert.SerializeObject(userInfo));
return View();
}