有没有可能在没有任何模型的情况下搭建一个dbcontext？

using Microsoft.EntityFrameworkCore;

public class MyDbContext : DbContext
{
    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlServer("your_connection_string");
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        // 使用 Fluent API 配置实体类型、属性、关系等
        // 这里是一个示例，你可以根据实际需求进行配置
        modelBuilder.Entity<User>()
            .HasKey(u => u.Id);
        modelBuilder.Entity<User>()
            .Property(u => u.Name)
            .IsRequired()
            .HasMaxLength(50);
        modelBuilder.Entity<User>()
            .HasMany(u => u.Orders)
            .WithOne(o => o.User)
            .HasForeignKey(o => o.UserId);
    }
}

public class User
{
    public int Id { get; set; }
    public string Name { get; set; }
    public ICollection<Order> Orders { get; set; }
}

public class Order
{
    public int Id { get; set; }
    public string ProductName { get; set; }
    public int UserId { get; set; }
    public User User { get; set; }
}