Extending Asp.Net Identity 2.0 with custom fields

Recently I needed a quick and low friction way of extending Asp.Net Identity 2.0, tying into the Entity Framework 6 way of working with custom fields and table mappings. To accomplish this first create something similar to a new ContosoIdentityUser which inherits from IdentityUser.

ContosoIdentityUser.cs

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using Microsoft.AspNet.Identity.EntityFramework;
 
namespace Contoso.Web
{
    public class ContosoIdentityUser : IdentityUser
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public DateTime DOB { get; set; }
        public string AddressLine1 { get; set; }
        public string AddressLine2 { get; set; }
        public string Suburb { get; set; }
        public string State { get; set; }
        public string Postcode { get; set; }
    }
}

We then likewise create a new ContosoIdentityDbContext which inherits from IdentityDbContext.

ContosoIdentityDbContext.cs

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using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Web;
 
using Microsoft.AspNet.Identity.EntityFramework;
 
namespace Contoso.Web
{
    public class ContosoIdentityDbContext : IdentityDbContext
    {
        public ContosoIdentityDbContext()
            : base("DefaultConnection")
        {
        }
 
        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            if (modelBuilder == null)
            {
                throw new ArgumentNullException("modelBuilder");
            }
 
            SetIdentityUserModel(modelBuilder);
            base.OnModelCreating(modelBuilder);
        }
 
        private void SetIdentityUserModel(DbModelBuilder modelBuilder)
        {
            modelBuilder.Entity().Property(x => x.FirstName).HasMaxLength(50).IsRequired();
            modelBuilder.Entity().Property(x => x.LastName).HasMaxLength(50).IsRequired();
            modelBuilder.Entity().Property(x => x.DOB).IsRequired();
            modelBuilder.Entity().Property(x => x.AddressLine1).HasMaxLength(100).IsRequired();
            modelBuilder.Entity().Property(x => x.AddressLine2).HasMaxLength(100).IsOptional();
            modelBuilder.Entity().Property(x => x.Suburb).HasMaxLength(50).IsRequired();
            modelBuilder.Entity().Property(x => x.State).HasMaxLength(3).IsRequired();
            modelBuilder.Entity().Property(x => x.Postcode).HasMaxLength(4).IsRequired();
        }
    }
}

Now to stitch it all together in your boot strapper logic, in my case this is within Startup(), just wire up to our newly created extensions:

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var userManager = new UserManager(new UserStore(new ContosoIdentityDbContext()));
UserManagerFactory = () => userManager;