ChangeTracker.state won't change to "Modified"

Question

Hi,

I am working on c# WCF program. I have a problem with self tracking. After I changed a value the ChangeTracker.state is still "Unchanged".

I declared data contractor as

    [DataContract]
    public class CustOrder
    {
        [DataMember]
        IList<Customer> CustomerRows;
        [DataMember]
        IList<Order> OrderRows;
    }

I followed the instructions in "Walkthrough: Serialize Self-Tracking Entities" (http://msdn.microsoft.com/en-us/library/ee789839(VS.100).aspx) to create the ServiceReference and the Model.tt and ModelContext.tt files.

On my Client side,  the WinForm project and MVP project all have the reference to the Model.tt and ServiceReference.

I got the custOrder and bind it to textboxes, like
textSurname.DataBindings.Add("Text", custOrder.CustomerRows[0], "Surname");

After I changed the surname and click a SaveChange button, however, I found the surname in the CustomerRows[0] was changed but the ChangeTracker.state for CustomerRows[0] was still "Unchanged", why? What could cause the problem?

Answer 1

So the information was updated in the database as you would expect?

Could it be that you looked at the ChangeTracker.state value after you called AcceptChanges method?

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Answer 2

Hi,

Thank u for your help.

I found the problem. I need in the ServiceReference project add a reference to the model.tt project, then generate the ServiceReferences.

Answer 3

Yes, this is something that needs to be fixed in the documentation.

Thank you!

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This posting is provided "AS IS" with no warranties, and confers no rights.