How to create a list page for Users in .Net Core 2 - .net-core

Question

We extended the Identity Roles as well Users:
using Microsoft.AspNetCore.Identity;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace AthlosifyWebArchery.Models
{
public class ApplicationRole : IdentityRole
{
public ApplicationRole() : base() { }
public ApplicationRole(string roleName) : base(roleName) { }
public ApplicationRole(string roleName, string description, DateTime createdDate) : base(roleName)
{
base.Name = roleName;
this.Description = description;
this.CreatedDate = createdDate;
}
public string Description { get; set; }
public DateTime CreatedDate { get; set; }
}
}
and
using Microsoft.AspNetCore.Identity;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Threading.Tasks;
namespace AthlosifyWebArchery.Models
{
public class ApplicationUser : IdentityUser
{
public ApplicationUser() : base() { }
public string FirstName { get; set; }
public string LastName { get; set; }
public string Address { get; set; }
public string Suburb { get; set; }
public string State { get; set; }
public string Postcode { get; set; }
public string Country { get; set; }
[InverseProperty("ApplicationUser")]
public IList<HostApplicationUser> HostApplicationUsers { get; set; }
[InverseProperty("HostApplicationCreatedUser")]
public HostApplicationUser HostApplicationCreatedUser { get; set; }
[InverseProperty("HostApplicationLastModifiedUser")]
public HostApplicationUser HostApplicationLastModifiedUser { get; set; }
[InverseProperty("ApplicationUser")]
public IList<ClubApplicationUser> ClubApplicationUsers { get; set; }
[InverseProperty("ClubApplicationCreatedUser")]
public ClubApplicationUser ClubApplicationCreatedUser { get; set; }
[InverseProperty("ClubApplicationLastModifiedUser")]
public ClubApplicationUser ClubApplicationLastModifiedUser { get; set; }
}
}
We are trying to create a Razor Page list of users as well their role:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.EntityFrameworkCore;
using AthlosifyWebArchery.Data;
using AthlosifyWebArchery.Models;
using Microsoft.AspNetCore.Identity;
namespace AthlosifyWebArchery.Pages.Administrators.Users
{
public class IndexModel : PageModel
{
private readonly AthlosifyWebArchery.Data.ApplicationDbContext _context;
public IndexModel(AthlosifyWebArchery.Data.ApplicationDbContext context)
{
_context = context;
}
public List<ApplicationUser> User { get; private set; }
public List<IdentityUserRole<string>> UsersRoles { get; set; } // get my roles or context of user
public List<IdentityRole> AllRoles { get; private set; }
public async Task OnGetAsync()
{
User = _context.Users.Include("UserRoles").ToList();
//UsersRoles = _context.UserRoles.ToList(); // get my roles or context of user
//AllRoles = _context.Roles.ToList();
}
}
}
We managed to get just the user list BUT not sure on how to include the Roles in this case.
Any pointer please?

Answer 1

Firstly, try to avoid using Include function's string overload. Using the lamda instead will help you be sure that the property exists. For instance, in this case, a property named UserRoles doesn't exist for your user class in the first place. Secondly, the syntax you are trying to use it generally used for a one to many relationships. Note that users and roles is a many to many relation and the identity context (that your dbcontext extended) has a UserRoles property for this. You should be able to get all users joined with their roles using a query like this:
IEnumerable<User> users = from u in context.Users
from r in context.Roles
from ur in context.UserRoles
where u.Id == ur.UserId && ur.RoleId == r.Id
select u;