ASP MVC 5-从父级删除子级实体

Question

How can I remove All child entities from a one to many relationship via the parent - Note I only want to remove the children.

public class Parent
{
    public int Id { get; set; }
    public ICollection<Child> Children { get; set; }
}

public class Child
{
    public int Id { get; set; }
    public int ParentId { get; set; }
    public string Name { get; set; }

    public virtual Parent Parent { get; set; }
}

Is there a shorthand way, lets say something like below:

 parent.children.Remove();

Answer 1

I believe that your mechanism for deleting the child elements in EF 4 and above should be:

parent.children.ToList().ForEach(c => context.Children.Remove(c));
context.SaveChanges();

I have found in the past that it may be faster to write a DELETE yourself, but you should decide what is best for you. Introducing a SQL DELETE in an Entity Framework solution adds some complexity both to testing and because your DELETE will depend on things you may have been trying to avoid as EF takes care of it all. Always measure before you optimize and decide what trade-offs work for you.