从未使用过 INotifyPropertyChanging 我想知道如果有什么比LINQ to SQL的其他用途呢？

Having never used INotifyPropertyChanging i was wondering if anything other than Linq to SQL uses it?

如果LINQ到SQL是唯一的用户为什么 INotifyPropertyChanging 存在System.ComponentModel？

And if Linq to SQL is the only user why does INotifyPropertyChanging exist in System.ComponentModel?

的http://msdn.microsoft.com/en-us/library/system.componentmodel.inotifypropertychanging.aspx

推荐答案

据反射;）INotifyPropertyChanging用于LINQ to SQL和它的第三方类似物（如Devart.Data.Linq）来优化实体变化跟踪（延缓实体快照，直到第一个变化）。

According to Reflector ;) INotifyPropertyChanging is used in Linq to SQL and its third party analogs (like Devart.Data.Linq) to optimize entity change tracking (delaying entity snapshot till first change).

基本上，如果你载入X，对象，所属的DataContext将创建这些对象（快照）第X份，如果他们不执行INotifyPropertyChanging。

Basically, if you load X objects, the owning DataContext will create X copies of those objects (snapshots), if they don't implement INotifyPropertyChanging.

通过实施INotifyPropertyChanging，只有X PropertyChangingEventHandlers将被创建。但是，一旦作为第一个改变是，DataContext的开始克隆。

With implemented INotifyPropertyChanging, only X PropertyChangingEventHandlers will be created. But as soon, as first change comes, DataContext starts cloning.

因此​​，要实现INotifyPropertyChanging才有意义，那么，当你的类的数据实体的DataContext（LINQ到SQL），在大量的加载和主要用于读操作。

So, to implement INotifyPropertyChanging makes sense only then, when your classes are data entities in DataContext (Linq to Sql), loaded in massive amounts and mostly for read operation.

我也想看看在你的织女项目可选支持INotifyPropertyChanging的;）

I would also like to see optional support of INotifyPropertyChanging in your Weaver project ;)