将String从string更改为int后，无法在Seed方法上添加新角色

Question

关注this文章到＆＃34;更改ASP.NET身份用户的主键＆＃34;在Seed方法中添加新角色时遇到问题。

  

无法将值NULL插入列'Id'，表'X.dbo.AspNetRoles';列不允许空值。 INSERT失败。
  声明已经终止。

我的代码是：

protected override void Seed(ApplicationDbContext context)
{
    var roleStore = new CustomRoleStore(context);
    var roleManager = new ApplicationRoleManager(roleStore);

    if (!roleManager.RoleExists("Administrador"))
        roleManager.Create(new CustomRole("Administrador"));
}

错误发生在最后一行：roleManager.Create ...

另外在教程中我在IdentityConfig.cs中有这个实现：

public class ApplicationRoleManager : RoleManager<CustomRole, int>
{
    public ApplicationRoleManager(IRoleStore<CustomRole, int> roleStore)
        : base(roleStore) { }

    public static ApplicationRoleManager Create(IdentityFactoryOptions<ApplicationRoleManager> options, IOwinContext context)
    {
        return new ApplicationRoleManager(new RoleStore<CustomRole, int, CustomUserRole>(context.Get<ApplicationDbContext>()));
    }
}

修改1

public partial class ApplicationDbContext : IdentityDbContext<ApplicationUser, CustomRole, int, CustomUserLogin, CustomUserRole, CustomUserClaim>
{
    public ApplicationDbContext()
        : base("DefaultConnection")
    {
    }

    public static ApplicationDbContext Create()
    {
        return new ApplicationDbContext();
    }
}

Answer 1

我可以为此付出一些努力。您可以手动更新数据库上的CustomRole表以具有自动增量值。然后覆盖EF OnModelCreating，如下所述。

public partial class ApplicationDbContext : IdentityDbContext<ApplicationUser, CustomRole, int, CustomUserLogin, CustomUserRole, CustomUserClaim>
{
    public ApplicationDbContext()
        : base("DefaultConnection")
    {
    }

    public static ApplicationDbContext Create()
    {
        return new ApplicationDbContext();
    }

    protected override void OnModelCreating(DbModelBinder modelBinder)
    {
        modelBinder.Entity<CustomRole>().ToTable("CustomRole"); // This may be not needed, check it.

        modelBinder.Entity<CustomRole>().Property(r => r.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
    }

}