Map tables using fluent api in asp.net MVC5 EF6?

问题

I am trying to add profile/Membership information into my MVC5 application and adding configuration mappings.

I get the following error message:

my.Models.IdentityUserLogin: : EntityType 'IdentityUserLogin' has no key defined. Define the key for this EntityType.

my.Models.IdentityUserRole: : EntityType 'IdentityUserRole' has no key defined. Define the key for this EntityType.

IdentityUserLogins: EntityType: EntitySet 'IdentityUserLogins' is based on type 'IdentityUserLogin' that has no keys defined.

IdentityUserRoles: EntityType: EntitySet 'IdentityUserRoles' is based on type 'IdentityUserRole' that has no keys defined.

public class ApplicationUser : IdentityUser
{
    public string City { get; set; }
    public string Discriminator { get; set; }

    public string Address { get; set; }     
}

public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
    public ApplicationDbContext()
        : base("DefaultConnection")
    {
    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Configurations.Add(new ApplicationUserConfiguration());           
    }
}

回答1:

Calling base.OnModelCreating(modelBuilder) did not solve the issue for me.

The behavior of Microsoft.AspNet.Identity.EntityFramework seems to be different in VS2013-Preview, VS2013-RC, and VS2013-RTM. I'm using the RTM version.

After inheriting from IdentityUser I had to recreate all other primary keys in the model to make it work:

public class ApplicationUser : IdentityUser
{
    public string DisplayName { get; set; }
}


public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
    public ApplicationDbContext() : base("DefaultConnection") { }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
        modelBuilder.Entity<IdentityUserLogin>().HasKey<string>(l => l.UserId);
        modelBuilder.Entity<IdentityRole>().HasKey<string>(r => r.Id);
        modelBuilder.Entity<IdentityUserRole>().HasKey(r => new { r.RoleId, r.UserId });
    }

(See Configuring/Mapping Properties and Types with the Fluent API)

I guess work on AspNet.Identity.EntityFramework is ongoing and this will be fixed (?)

回答2:

Call base.OnModelCreating(modelBuilder) after configuration added.

回答3:

Follow these steps around OnModelCreating method and test after each one to be aware of taking effect:

1. Make sure you have one Context to prevent of their rule conflicts.
2. Call base.OnModelCreating(modelBuilder); inside the mentioned method (first of all)
3. Add the followings plus previews step in the method:

modelBuilder.Entity<IdentityUserLogin>().HasKey<string>(l => l.UserId);
modelBuilder.Entity<IdentityRole>().HasKey<string>(r => r.Id);
modelBuilder.Entity<IdentityUserRole>().HasKey(r => new { r.RoleId, r.UserId });

来源：https://stackoverflow.com/questions/19474662/map-tables-using-fluent-api-in-asp-net-mvc5-ef6