C# .NET entity-framework entity-framework-4

在实体框架中查找变更集

发布于 2024-11-03 23:16:33 字数 315 浏览 1 评论 0原文

我在 ASP.NET MVC3/WCF 应用程序中使用 EF4 存储库。我正在使用工作单元模式将更改应用到数据库，

用户要求之一是创建包含实体更改列表的票证/电子邮件。有没有办法可以在以下函数中仅检测实体上更改的属性？

public void UpdateTrackedEntity<T>(T modifiedEntity) where T : class
{
    var set = CreateObjectSet<T>();
    set.ApplyCurrentValues(modifiedEntity);
}

原文

I am using EF4 repositories in a ASP.NET MVC3/WCF application. I am using the Unit of Work pattern to apply changes to the database

One of the user requirements is to create a ticket/email with a list of changes to the entity. Is there a way I can detect only the changed properties on an entity in the following function?

public void UpdateTrackedEntity<T>(T modifiedEntity) where T : class
{
    var set = CreateObjectSet<T>();
    set.ApplyCurrentValues(modifiedEntity);
}

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落叶缤纷 2024-11-10 23:16:33

是的，有一种方法：

public void UpdateTrackedEntity<T>(T modifiedEntity) where T : class
{
    var set = CreateObjectSet<T>();
    set.ApplyCurrentValues(modifiedEntity);
    var entry = ObjectStateManager.GetObjectStateEntry(modifiedEntity);
    // entry has two collections: CurrentValues (those you applied) and 
    // OriginalValues (those loaded from DB)
    // It also have method GetModifiedProperties to get collection of modified 
    // property names.
}

检查 ObjectStateEntry更多细节。

Yes there is a way:

public void UpdateTrackedEntity<T>(T modifiedEntity) where T : class
{
    var set = CreateObjectSet<T>();
    set.ApplyCurrentValues(modifiedEntity);
    var entry = ObjectStateManager.GetObjectStateEntry(modifiedEntity);
    // entry has two collections: CurrentValues (those you applied) and 
    // OriginalValues (those loaded from DB)
    // It also have method GetModifiedProperties to get collection of modified 
    // property names.
}

Check ObjectStateEntry for more details.

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榕城若虚 2024-11-10 23:16:33

假设您的域服务对象是 DsrvObj

 DsrvObj.EntityContainer.GetChanges() 
                      ...GetChanges().AddedEntities.Count /*also possible for modified and romoved ones*/

//这些可能是有益的，也

           DsrvObj.HasChanges
           DsrvObj.MS_EntitySets.HasChanges

将为您提供变更集，但有趣的是，我今天在这个变更集中看不到一些修改的布尔字段！最后我意识到，例如，如果 DataGrid 处于编辑模式，您的更改不会进入变更集，结束编辑后它会进入变更集。

实施它，测试它，相信它！

Suppose that your domain service object is DsrvObj

 DsrvObj.EntityContainer.GetChanges() 
                      ...GetChanges().AddedEntities.Count /*also possible for modified and romoved ones*/

//These ones could be beneficial also

           DsrvObj.HasChanges
           DsrvObj.MS_EntitySets.HasChanges

will give you the changeset, But interestingly I can't see some modified boolean fields on this changeset today! Finally I realized that for instance if a DataGrid is in EditMode your changes doesnt go to changeset,After end edit it goes to changeset.

implement it ,test it ,Trust it!

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