C# EF6多对多、WillCascadeOnDelete和多个级联路径

在EF6 CodeFirst中，我想建模与导航属性的多对多关系

课程包括：

public class Event
{
    [DataMember]
    [Required]
    public int Id { get; set; }

    // Other properties

    [DataMember]
    public virtual ICollection<Notification> Notifications { get; set; }
}

public class Notification
{
    [DataMember]
    [Required]
    public int Id { get; set; }

    // Other properties

    [DataMember]
    public virtual ICollection<Event> Events { get; set; }
}

class EventConfiguration : EntityTypeConfiguration<Event>
{
    public EventConfiguration()
    {
        HasMany(e => e.Notifications)
            .WithMany(e => e.Events)
            .Map(m => m.ToTable("NotificationEvents"));
    }
}

我得到：

在类型上声明的导航属性“Events” “通知”已配置为 相互冲突的多样性

class NotificationConfiguration : EntityTypeConfiguration<Notification>
{
    public NotificationConfiguration()
    {
        HasOptional(e => e.Events).WithMany().WillCascadeOnDelete(false);
    }
}