Entity Framework Core 2.0支持自定义映射配置

 public class ApplicationDbContext : IdentityDbContext<ApplicationUser>

    
 {
    
     public DbSet<OrderItem> OrderItems { get; set; }
    
  
    
     public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options) : base(options) { }
    
  
    
     protected override void OnModelCreating(ModelBuilder builder)
    
     {
    
     base.OnModelCreating(builder);
    
     
    
     // 自定义必须包括 base.OnModelCreating(builder)
    
  
    
     builder.ApplyConfiguration(new ApplicationUserConfig());
    
     builder.ApplyConfiguration(new OrderItemConfig());