EF Code First约定允许ICollection <T>属性为空集合而不是null？

Question

我注意到,默认情况下,Entity Framework Code First忽略了实例化ICollection<T>属性,除非集合中至少有一个项目.我更倾向于保证集合总是空的HashSet(即,HashSet零项目),而不是null没有项目存在.

EF Code First是否有任何约定或设置可以启用此功能？

Answer 1

在实体的构造函数中,只需设置实例化集合:

public sealed partial class EntityClass
{
    [SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors",
        Justification = "EF 4.1 requires them to be virtual, and RIA Services requires the collections to be instantiated.")]
    public EntityClass()
    {
        OtherEntities = new List<OtherEntity>();
    }

    public virtual ICollection<OtherEntity> OtherEntities { get; set; }
}

FXcop有抑制消息.