Change tracking over wcf with poco proxys

Question

Hi there, :)

at first sorry for my (hopely not too) bad english and greetings from germany.

I have the following screnario:
I am working with poco proxys and send the objects over wcf to a client.
The client change some thinks and send it back.

The first i try to update where:

dataServerDBContext.ApplyCurrentValues("Project", project);

// apply changes
dataServerDBContext.AcceptAllChanges();
dataServerDBContext.SaveChange(SaveOptions.DetectChangesBeforeSave); 

But whats happen is that the propertys of the poco object where saved but not the relationshipps this other object
(for example: "Project" has 1:n "Contacts")

The second i try was:

// Get ObjectStateEntry from EntityKey.
ObjectStateEntry stateEntry = dataServerDBContext.ObjectStateManager.GetObjectStateEntry(project);

but i can see tha the back comming object is not a proxy anymore.

can you please help me to make a complet change tracking on the update back sended poco object??

thanks for you answeres and best regards

Steffen Mangold

Answer 1

After some more searching the web i found out that ApplyCurrentValues("Project", project); dont saves relationships. So that was the false way.

So my question is, after recieving an entity, is there a way to automaticly let the EF4 detect witch relationsship has changed (added, deleted)??

 

PLS help

Answer 2

Yes,

You can do something like this:

var relationship = context.ObjectStateManager.GetObjectStateEntries(EntityState.Added);

Hope this help,

JAReyes.

Answer 3

no sry i cant do this. because i recieve a persist ignore POCO object, so i have no direct change tracking to look what the client has changed. I only see the editing result.

Answer 4

Hi again Steffen,

 

I assume you go on researching this issue in these threads,

http://social.msdn.microsoft.com/Forums/en-US/adodotnetentityframework/thread/f0a0288b-76f3-491b-98eb-41808b61e60f

http://social.msdn.microsoft.com/Forums/en-US/adodotnetentityframework/thread/e4fa81b8-8593-41a2-81d7-2bccabadce27

 

Let’s continue the discussion there.   

 

Good day!

 

 

Best Regards,

Lingzhi Sun

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