<转>Entity Framework Code First级联删除
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:
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; } }
可以看到,在生成的数据库中,外键应用了级联删除规则
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);