Question

我有两个实体People和FollowUps，一对多关系，cascadedelete。如此处所定义（OnModelCreating）：

modelBuilder.Entity<FollowUp>()
   .HasRequired(c => c.FollowUpPeople)
   .WithMany(p => p.FollowUps)
   .HasForeignKey(c => c.PersonID)
   .WillCascadeOnDelete(true);

我的模型实体是：

public class FollowUp {
   public int ID { get; set; }
   public int PersonID { get; set; }
   public virtual People FollowUpPeople { get; set; }
}

和人：

public class People {
    public int ID { get; set; }
    public virtual ICollection<FollowUp> FollowUps { get; set; }
}

当与人物实体一一删除时，级联删除工作正常。例如：

context.People.Remove(person1);
context.People.Remove(person2);
context.SaveChanges();

使用RemoveRange时我得到一个例外：

The operation failed: The relationship could not be changed because one or
more of the foreign-key properties is non-nullable. When a change is made to a
relationship, the related foreign-key property is set to a null value. If the
foreign-key does not support null values, a new relationship must be defined,
the foreign-key property must be assigned another non-null value, or the
unrelated object must be deleted.

修改以下是调用删除范围的方法：

List<People> peopleToAdd = new List<People>() { person1, person2 };
context.People.RemoveRange(peopleToAdd);
context.SaveChanges();

Answer 1

RemoveRanges() 不支持级联删除。您所能做的就是，使用适合您的 foreach 或 for 循环，然后使用 remove()。例如。在你的情况下，你可以做的是，

foreach(People people in peopleToAdd){
  context.People.Remove(people);
}
context.SaveChanges();

实体框架RemoveRange不是CascadeDelete

1 个答案: