如何才能知道EF对象的导航属性已更改？ [英] How can I get know that Navigation Property of the EF-object is changed?

问题描述

我必须将所有更改的对象从客户端发送到服务器。但要做到这一点，我必须确定哪些对象已被更改。事件'PropertyChanged'仅适用于简单类型。如何知道某些导航属性或相关对象已更改？

I have to send all changed objects from client to the server. But to do it I have to determinate, which objects have been changed. Event 'PropertyChanged' works only for simple types. How can I get know that some navigation properties or related objects has been changed?

推荐答案

使用分部类扩展ObjectContext。并管理其SavingChanges事件。

例如：
$

Extend your ObjectContext with partial class. And manage its SavingChanges event.

Example:

 For Each Entry As ObjectStateEntry In MyContext.ObjectStateManager.GetObjectStateEntries(EntityState.Added) 'You can use modified also
            If Entry.IsRelationship And (TypeOf Entry.Entity Is SalesQuote) Then 'You can "filter" entity types
                'Do something with SalesQuote in added state
            End If
 Next

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