Print Page | Close Window

Save not working if Entity is DataSource of a BindingSource

Printed From: IdeaBlade
Category: DevForce
Forum Name: DevForce 2009
Forum Discription: For .NET 3.5
URL: http://www.ideablade.com/forum/forum_posts.asp?TID=1344
Printed Date: 22-Sep-2025 at 7:49am


Topic: Save not working if Entity is DataSource of a BindingSource
Posted By: glenwinn
Subject: Save not working if Entity is DataSource of a BindingSource
Date Posted: 23-Jun-2009 at 11:32am
I just upgraded to 5.1.1 and am now having problems saving an entity that is a data source for a System.Windows.Forms.BindingSource.  The code was working fine until I upgraded.  I am using the BindingSource with a ControlBindingManager.
 
The exception is :
 
EntityManagerSaveException:
 
An error occurred while receiving the HTTP response to http://citybots-dev.citybots.com:9009/EntityServer - . This could be due to the service endpoint binding not using the HTTP protocol. This could also be due to an HTTP request context being aborted by the server (possibly due to the service shutting down). See server logs for more details.
 
 


Replies:
Posted By: kimj
Date Posted: 23-Jun-2009 at 8:13pm
A few things to check -
 
 - make sure you've rebuilt the domain model and that this updated version is the same on both client and server
 - check all the DevForce assemblies on both client and server to make sure they are also in sync
 
Check the debuglog generated on the server - it might have logged an error prior to the client receiving this message.
 
Let me know what you find.

Posted By: glenwinn
Date Posted: 24-Jun-2009 at 6:28am
  1. I made sure the model on the server and the client were the same version by rebuilding all and deploying to the BOS directory.
  2. I checked the version of the IdeaBlade dlls on the client and the server and they are correct (5.1.1.0 and 3.6.7.1)
 
Here is the simple Windows Forms program I am using (Sorry for the bad formatting):
If I comment out the line that assigns the _vendor to the DataSource property then everything works.

public partial class Form1 : Form

{

DomainModelEntityManager _em = new DomainModelEntityManager(true, "Dev");

Vendor _vendor;

public Form1()

{

InitializeComponent();

IdeaBladeConfig idconfig = IdeaBladeConfig.Instance;

ObjectServerElement osel = idconfig.ObjectServer;

osel.ServerPort = 9009;

osel.RemoteBaseUrl = "http://citybots-dev.citybots.com";

LoginCredential lc = new LoginCredential("xxx", "xxx", "dev");

_em.Login(lc);

_vendor = _em.Vendors.Where(vendor => vendor.AutoId == 2560).FirstOrNullEntity();

this.txtVendorName.Text = _vendor.Name;

bindingSource1.DataSource = _vendor;

}

private void btnSave_Click(object sender, EventArgs e)

{

_vendor.Name = this.txtVendorName.Text;

_em.SaveChanges();

}

private void btnExit_Click(object sender, EventArgs e)

{

this.Close();

}

}

 
Here is the debug log from the server:
 
2009-06-24 08:11:43 gwinn@winns.us IdeaBlade.EntityModel.Server EntityServer::Fetch Fetch ... value(IdeaBlade.EntityModel.EntityQueryProxy`1[DomainModel.Vendor]).Where(vendor => (vendor.AutoId = 2560)).FirstOrDefault()
2009-06-24 08:11:43 gwinn@winns.us IdeaBlade.EntityModel.Edm ObjectQueryProcessor::WriteGeneratedSql SELECT 1 AS [C1], [Extent1].[Id] AS [Id], [Extent1].[AutoId] AS [AutoId], [Extent1].[EId] AS [EId], [Extent1].[Name] AS [Name], [Extent1].[Creator] AS [Creator], [Extent1].[CreateDate] AS [CreateDate], [Extent1].[LastUpdater] AS [LastUpdater], [Extent1].[LastUpdate] AS [LastUpdate], [Extent1].[RowVersion] AS [RowVersion], [Extent1].[DoingBusinessAs] AS [DoingBusinessAs], [Extent1].[TaxId] AS [TaxId], [Extent1].[BusinessDescription] AS [BusinessDescription], [Extent1].[SessionId] AS [SessionId], [Extent1].[IsDeleted] AS [IsDeleted], [Extent1].[CertString] AS [CertString], [Extent1].[EthnicGroup] AS [EthnicGroup], [Extent1].[Gender] AS [Gender], [Extent1].[VendorType] AS [VendorType], [Extent1].[IngressMethod] AS [IngressMethod], [Extent1].[FeedSource] AS [FeedSource] FROM [dbo].[Vendor] AS [Extent1] WHERE 2560 = [Extent1].[AutoId]
2009-06-24 08:11:47 gwinn@winns.us IdeaBlade.EntityModel.Server EntityServer::GetInstanceImplementing Unable to locate an implementation of: IdeaBlade.EntityModel.IEntityServerSaving
2009-06-24 08:11:47 gwinn@winns.us IdeaBlade.EntityModel.Server EdmSaveHelper::<TraceChanges>b__4f Vendors to be Modified: 1
2009-06-24 08:11:58 gwinn@winns.us IdeaBlade.EntityModel.Server EntityServer::GetInstanceImplementing Unable to locate an implementation of: IdeaBlade.EntityModel.IEntityServerSaved
2009-06-24 08:11:58 gwinn@winns.us IdeaBlade.EntityModel.Server EdmSaveHelper::<TraceChanges>b__4f Vendors to be Modified: 1
2009-06-24 08:11:58 gwinn@winns.us IdeaBlade.EntityModel.Server EdmSaveHelper::Save Entity Save Error: System.Data.OptimisticConcurrencyException: Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded. Refresh ObjectStateManager entries. at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter) at System.Data.EntityClient.EntityAdapter.Update(IEntityStateManager entityCache) at System.Data.Objects.ObjectContext.SaveChanges(Boolean acceptChangesDuringSave) at System.Data.Objects.ObjectContext.SaveChanges() at IdeaBlade.EntityModel.Server.EdmSaveHelper.Save()

Posted By: kimj
Date Posted: 24-Jun-2009 at 9:18am
The server debuglog shows that a concurrency exception occurred.  Do you have any concurrency fields defined for the Vendor entity, and if so, how is the value updated?

Posted By: glenwinn
Date Posted: 24-Jun-2009 at 10:32am
Yes,  it is an integer field set as auto increment in the object mapper.
 
I also noticed that the server is trying to save the entity twice when I called .SaveChanges() just once on the client.  This behavior changes when I do not set the DataSource property of the binding source.  The 'Vendors to be Modified: 1' log entry only shows up once.

Posted By: kimj
Date Posted: 24-Jun-2009 at 1:00pm

Sorry, but I can't repro the problem you're seeing.  Please zip up a solution showing the problem and send it to mailto:IdeaBladeSupportTrack@ideablade.com - IdeaBladeSupportTrack@ideablade.com , referencing task #5550 in the subject line.  Thanks!

Posted By: glenwinn
Date Posted: 25-Jun-2009 at 12:25pm
 
I emailed a visual studio solution that demonstrates the problem to mailto:IdeaBladeSupportTrack@ideablade.com - IdeaBladeSupportTrack@ideablade.com , referencing task #5550 in the subject line. 


Print Page | Close Window