public virtual void Delete()
{
//保存当前detail presenter 的引用
var presenter = CurrentDetailPresenter;
//如果要删除的presenter的实体不是新增的，那么就下delete命令，删除它
if (!CurrentEditingObject.IsNew)
{
OnDelete(presenter.Entity);
}
//找到要删除的index
var index = Presenters.IndexOf(presenter);
//找到要激活的（置为当前页）的presenter
var shouldActionPresenter = DetermineNextPresenterToActivate(index);
//切换到要激活的presenter
CollectionView.MoveCurrentTo(shouldActionPresenter);
//关闭删除的presenter
this.Shutdown(presenter);
}
