Entity Framework Code First级联删除(转)

时间:2022-09-04 13:33:56

使用Data Annotations:

如果我们要到一对主从表增加级联删除,则要在主表中的引用属性上增加Required关键字,如:

Entity Framework Code First级联删除(转)
 public class Destination
{
public int DestinationId { get; set; }
public string Name { get; set; }
public string Country { get; set; }
public string Description { get; set; }
public byte[] Photo { get; set; }
public List<Lodging> Lodgings { get; set; }
} public class Lodging
{
public int LodgingId { get; set; }
public string Name { get; set; }
public string Owner { get; set; }
public bool IsResort { get; set; }
public decimal MilesFromNearestAirport { get; set; }
[Required]
public Destination Destination { get; set; }
}
Entity Framework Code First级联删除(转)

可以看到,在生成的数据库中,外键应用了级联删除规则

Entity Framework Code First级联删除(转)

使用Fluent API:

modelBuilder.Entity<Lodging>().HasRequired(l => l.Destination).WithMany(d => d.Lodgings).WillCascadeOnDelete(true);

相对应的,如果要关闭级联功能则为:

modelBuilder.Entity<Lodging>().HasRequired(l => l.Destination).WithMany(d => d.Lodgings).WillCascadeOnDelete(false);

转自:http://www.cnblogs.com/Gyoung/archive/2013/01/22/2871919.html