public class DataBaseContext : DbContext { public DbSet<User> Users { get; set; } public DbSet<Cabin> Cabins { get; set; } public DbSet<Sensor> Sensors { get; set; } public DbSet<CommuServer> CommuServers { get; set; } public DbSet<ComServerPort> Ports { get; set; } public DbSet<CoreBoard> CoreBoards { get; set; } public DbSet<HullInfo> Hulls { get; set; } public DataBaseContext() : base("name=MyConnectionString") { } } /// <summary> /// 舱体 /// </summary> public class Cabin { /// <summary> /// 舱体ID /// </summary> [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int Id { get; set; } /// <summary> /// 舱体名称 /// </summary> [Key] public string Name { get; set; } /// <summary> /// 舱体内的通信设备 /// </summary> public virtual ICollection<CommuServer> CommuServers { get; set; } /// <summary> /// 核心板 /// </summary> public virtual CoreBoard CoreBoard { get; set; } }如何通过Cabin获取CoreBoard

可以通过以下代码来获取Cabin的CoreBoard：

var cabin = dbContext.Cabins.Include(c => c.CoreBoard).FirstOrDefault(c => c.Id == cabinId);
var coreBoard = cabin.CoreBoard;

其中，`dbContext`是`DataBaseContext`的实例，`cabinId`是需要查询的Cabin的Id。`Include`方法用于指定需要包含在查询结果中的导航属性，这里是`CoreBoard`。`FirstOrDefault`方法用于查找符合条件的第一个实体，这里是根据`Id`查找Cabin。最后，通过`cabin.CoreBoard`获取对应的CoreBoard实例。