ObservableCollection 和 BindingList 的区别 [英] Difference between ObservableCollection and BindingList

问题描述

我想知道 ObservableCollection 和 BindingList 之间的区别，因为我已经使用两者来通知 Source 中的任何添加/删除更改，但我实际上不知道什么时候更喜欢一个.

I want to know the difference between ObservableCollection and BindingList because I've used both to notify for any add/delete change in Source, but I actually do not know when to prefer one over the other.

为什么我会选择以下其中之一?

Why would I choose one of the following over the other?

ObservableCollection<Employee> lstEmp = new ObservableCollection<Employee>();

或

BindingList<Employee> lstEmp = new BindingList<Employee>();

推荐答案

ObservableCollection 可以像任何集合一样从 UI 更新.真正的区别相当简单:

An ObservableCollection can be updated from UI exactly like any collection. The true difference is rather straightforward:

ObservableCollection 实现了 INotifyCollectionChanged，它在集合更改时提供通知(你猜对了 ^^)它允许绑定引擎在 ObservableCollection 更新时更新 UI.

ObservableCollection<T> implements INotifyCollectionChanged which provides notification when the collection is changed (you guessed ^^) It allows the binding engine to update the UI when the ObservableCollection is updated.

然而，BindingList 实现了 IBindingList.

IBindingList 提供有关集合更改的通知，但不仅如此.它提供了一大堆功能，用户界面可以使用这些功能来提供更多的东西，而不仅仅是根据变化更新用户界面，例如:

IBindingList provides notification on collection changes, but not only that. It provides a whole bunch of functionality which can be used by the UI to provide a lot more things than only UI updates according to changes, like:

• 排序
• 正在搜索
• 通过工厂添加(AddNew 成员函数).
• 只读列表(CanEdit 属性)

所有这些功能在 ObservableCollection

另一个区别是 BindingList 在其项目实现 INotifyPropertyChanged 时中继项目更改通知.如果一个项目引发一个 PropertyChanged 事件，BindingList 将接收它并引发一个带有 ListChangedType.ItemChanged 的 ListChangedEvent 和OldIndex=NewIndex(如果一个项目被替换，OldIndex=-1).ObservableCollection 不中继项目通知.

Another difference is that BindingList relays item change notifications when its items implement INotifyPropertyChanged. If an item raises a PropertyChanged event, the BindingList will receive it an raises a ListChangedEvent with ListChangedType.ItemChanged and OldIndex=NewIndex (if an item was replaced, OldIndex=-1). ObservableCollection doesn't relay item notifications.

请注意，在 Silverlight 中，BindingList 不可用作选项:但是，您可以使用 ObservableCollections 和 ICollectionView(和 如果我没记错的话，IPagedCollectionView).

Note that in Silverlight, BindingList is not available as an option: You can however use ObservableCollections and ICollectionView (and IPagedCollectionView if I remember well).

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