DevForce Community Forum : PropertyChanged event not firing in Distributed mode.

PropertyChanged event not firing in Distributed mode. : Makes sense. Thanks!Bryan

Mon, 16 May 2011 11:43:57 -700

Author: BringerOD
Subject: 2675
Posted: 16-May-2011 at 11:43am

Makes sense.

Thanks!

Bryan

PropertyChanged event not firing in Distributed mode. : Hi Bryan, What's happening...

Mon, 16 May 2011 11:35:19 -700

Author: sbelini
Subject: 2675
Posted: 16-May-2011 at 11:35am

Hi Bryan,

What's happening in your code is that you are setting the event handler in the entity's constructor and serialization (i.e. n-tier) does not use the constructor. (in this case you'd only see the event fired on new enitities you created in the client)

Also, bear in mind that even in 2-tier, if you load 1000 entities, you'd be setting 1000 event handlers. (one for each entity) That's not very efficient and I suggest you use EntityGroup.EntityPropertyChanged instead:

var eGroup = _entities.GetEntityGroup(typeof(Customer));

eGroup.EntityPropertyChanged += new EventHandler<EntityPropertyChangedEventArgs

(eGroup_EntityPropertyChanged);

...

void eGroup_EntityPropertyChanged(object sender, EntityPropertyChangedEventArgs e) {

if (e.Property.Name == "CompanyName") {

var Test = 1;

}

Silvio.

PropertyChanged event not firing in Distributed mode. : uploads/916/PropertyChangeEventTest1.zip I...

Sat, 14 May 2011 11:37:35 -700

Author: BringerOD
Subject: 2675
Posted: 14-May-2011 at 11:37am

uploads/916/PropertyChangeEventTest1.zip

I uploaded a sample.

Set distributed to false. Put a breakpoint in the Customer class on the property changed event. Edit the company name field, leave the column to trigger the property event. The event will fire.

Set distributed to true and do the same thing. The event will NOT fire.

void Customer_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)

{

if (e.PropertyName == "CompanyName")

{

var Test = 1;

}

Bryan Reynolds

PropertyChanged event not firing in Distributed mode. : Hi Bryan, I could not reproduce...

Fri, 13 May 2011 16:05:02 -700

Author: sbelini
Subject: 2675
Posted: 13-May-2011 at 4:05pm

Hi Bryan,

I could not reproduce your issue here.

In my test case PropertyChanged fires in both 2 and n-tier.

When you set isDistributed ="true" in the App.Config did you update the connectionString in the Web.Config file? (btw, you don't really need to comment out the connectionString in the App.Config file - setting isDistributed="true" will suffice)

Can you provide a simple test case (against NorthwindIB) reproducing the issue?

Silvio.

Edited by sbelini - 13-May-2011 at 4:07pm

PropertyChanged event not firing in Distributed mode. : When I handled the PropertyChanged...

Thu, 12 May 2011 22:29:04 -700

Author: BringerOD
Subject: 2675
Posted: 12-May-2011 at 10:29pm

When I handled the PropertyChanged event on an entity itfires as expected when my application is connected to the database server inthe App.Config.

When I switch it to use the webservice in distributed modeand comment out the connection to the database like below, the event no longerfires. Is this by design and if so howto I trap the property changed event.

<objectServer remoteBaseURL = "http://XXX.XXX.XXX"

serverPort = "80"

serviceName = "EntityService.svc" >

objectServer>