List users with Roles

Ok, I'm new to .NET at all. (Some Programming knowledge)

- I created a new .NET CORE project.

- Added 4 Roles to the AspNetRoles DataBase

- In the AccountController, on the Register[POST] action added this for all users to have a rol:

await _userManager.AddToRoleAsync(user, "Llamada"); //"llamada" is the base rol for everyone

- Added some 'fileds' to the AplicationUser.cs Model

- Scaffold-ed the AplicationUser.cs Model

- Modified the Index and Edit Views to show Rol:

//Index view

@model IEnumerable<Avivamiento.Models.ApplicationUser>

@{
    ViewData["Title"] = "Index";
}<h2>Index</h2><p><a asp-action="Create">Create New</a></p><table class="table"><thead><tr><th>
                @Html.DisplayNameFor(model => model.CC)</th><th>
                @Html.DisplayNameFor(model => model.Nombre)</th><th>
                @Html.DisplayNameFor(model => model.Apellido)</th><th>Rol</th><th></th></tr></thead><tbody>
@foreach (var item in Model) {<tr><td>
                @Html.DisplayFor(modelItem => item.CC)</td><td>
                @Html.DisplayFor(modelItem => item.Nombre)</td><td>
                @Html.DisplayFor(modelItem => item.Apellido)</td><td>  @Html.DisplayFor(modelItem => item.Roles)</td><td><a asp-action="Edit" asp-route-id="@item.Id">Edit</a> |<a asp-action="Details" asp-route-id="@item.Id">Details</a> |<a asp-action="Delete" asp-route-id="@item.Id">Delete</a></td></tr>
}</tbody></table>

//Edit view

@model Avivamiento.Models.ApplicationUser

@{
    ViewData["Title"] = "Edit";
}<h2>Edit</h2><form asp-action="Edit"><div class="form-horizontal"><h4>ApplicationUser</h4><hr /><div asp-validation-summary="ModelOnly" class="text-danger"></div><input type="hidden" asp-for="Id" /><div class="form-group"><label asp-for="CC" class="col-md-2 control-label"></label><div class="col-md-10"><input asp-for="CC" class="form-control" /><span asp-validation-for="CC" class="text-danger" /></div></div><div class="form-group"><label asp-for="Nombre" class="col-md-2 control-label"></label><div class="col-md-10"><input asp-for="Nombre" class="form-control" /><span asp-validation-for="Nombre" class="text-danger" /></div></div><div class="form-group"><label asp-for="Apellido" class="col-md-2 control-label"></label><div class="col-md-10"><input asp-for="Apellido" class="form-control" /><span asp-validation-for="Apellido" class="text-danger" /></div></div><div class="form-group"><label asp-for="Roles" class="col-md-2 control-label"></label><div class="col-md-10"><input asp-for="Roles" class="form-control" /><span asp-validation-for="Roles" class="text-danger" /></div></div><div class="form-group"><div class="col-md-offset-2 col-md-10"><input type="submit" value="Save" class="btn btn-default" /></div></div></div></form><div><a asp-action="Index">Back to List</a></div>

@section Scripts {
    @{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
}

- Successfully created an user and confirmed on the AspNetUserRoles the ids for my user and the rol I 'enforced'

But on the Index view the rol is empty, and the Edit view the Input control for Rol gets:

System.Collections.Generic.List[Microsoft.AspNetCore.Identity.EntityFrameworkCore.IdentityUserRo[System.String]]

So I don't see the Rol asigned. I tried different combinations to try to solve. i.e. in the Index view tried

@Html.DisplayFor(modelItem => item.Roles.SingleOrDefault())

But get a different error and so on.

How can I get the rol the user has?

Thanks.