c# - Extending ASP.NET Identity Roles: IdentityRole is not part of the model for the current context

Question

I'm trying to use the new ASP.NET Identity in my MVC5 application, specifically I'm trying to integrate ASP.NET Identity into an existing database. I've already read the questions/answers on SO pertaining to DB First and ASP.NET Identity, and having followed all the recommendations I still can't add roles to my database, although I have no problems adding users. Here's my code:

var context = new PayrollDBEntities();
var roleManager = new RoleManager<AspNetRole>(new RoleStore<AspNetRole>(context));

bool roleExists = roleManager.RoleExists(roleDto.Name);
if (roleExists){
    return false;
}

var role = new AspNetRole(roleDto.Name){
    Name = roleDto.Name,
};

IdentityResult result = roleManager.Create(role);//Getting exception here

At the last line of code I get an exception of type 'System.InvalidOperationException': The entity type IdentityRole is not part of the model for the current context.

Here is my context:

public partial class PayrollDBEntities : IdentityDbContext
{
        public PayrollDBEntities()
            : base("name=PayrollDBEntities")
        {
        }

        public virtual DbSet<AspNetRole> AspNetRoles { get; set; }
        public virtual DbSet<AspNetUserClaim> AspNetUserClaims { get; set; }
        public virtual DbSet<AspNetUserLogin> AspNetUserLogins { get; set; }
        public virtual DbSet<AspNetUser> AspNetUsers { get; set; }
......
}

My AspNetUser and AspNetRole classes derive from IdentityUser and IdentityRole respectively, but I'm still getting that exception. Here is my database diagram:

Any help would be greatly appreciated.

Answer 1

You have to specify during the creation of User Store that AspNetRole is used instead of IdentityRole. You can achieve this by using the UserStore class with 6 type parameters:

new UserStore<AspNetUser, AspNetRole, string, IdentityUserLogin, IdentityUserRole, IdentityUserClaim>(new PayrollDBEntities());

This indicates changes at User Manager creation as well. Here is a simplified example about the creation of needed instances:

public class AspNetUser : IdentityUser { /*customization*/ }

public class AspNetRole : IdentityRole { /*customization*/ }

public class PayrollDBEntities : IdentityDbContext //or : IdentityDbContext <AspNetUser, AspNetRole, string, IdentityUserLogin, IdentityUserRole, IdentityUserClaim> 
{
}

public class Factory 
{
    public IdentityDbContext DbContext 
    { 
        get 
        {
            return new PayrollDBEntities();
        } 
    }

    public UserStore<AspNetUser, AspNetRole, string, IdentityUserLogin, IdentityUserRole, IdentityUserClaim> UserStore
    {
        get 
        {                
            return new UserStore<AspNetUser, AspNetRole, string, IdentityUserLogin, IdentityUserRole, IdentityUserClaim>(DbContext);
        }
    }

    public UserManager<AspNetUser, string> UserManager
    { 
        get 
        {
            return new UserManager<AspNetUser, string>(UserStore);
        } 
    }

    public RoleStore<AspNetRole> RoleStore 
    {
        get 
        {
            return new RoleStore<AspNetRole>(DbContext);
        }
    }

    public RoleManager<AspNetRole> RoleManager 
    {
        get 
        {
            return new RoleManager<AspNetRole>(RoleStore);
        }
    }
}