如何使用asp.net实体框架获取sql外键中的数据？

// 数据上下文类
public class MyDbContext : DbContext
{
    public DbSet<Order> Orders { get; set; }
    public DbSet<Customer> Customers { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        // 配置外键关系
        modelBuilder.Entity<Order>()
            .HasRequired(o => o.Customer)
            .WithMany()
            .HasForeignKey(o => o.CustomerId);
    }
}

// 实体类
public class Order
{
    public int OrderId { get; set; }
    public string OrderName { get; set; }
    public int CustomerId { get; set; }
    public Customer Customer { get; set; }
}

public class Customer
{
    public int CustomerId { get; set; }
    public string CustomerName { get; set; }
    public ICollection<Order> Orders { get; set; }
}

// 获取外键数据
using (var context = new MyDbContext())
{
    var orders = context.Orders.Include(o => o.Customer).ToList();
    foreach (var order in orders)
    {
        var customerName = order.Customer.CustomerName;
        // 处理外键数据
    }
}