DevForce 2010: Null Exception when creating an entity

Null Exception when creating an entity

Printed From: IdeaBlade
Category: DevForce
Forum Name: DevForce 2010
Forum Discription: For .NET 4.0
URL: http://www.ideablade.com/forum/forum_posts.asp?TID=2982
Printed Date: 03-Apr-2025 at 12:44pm

Topic: Null Exception when creating an entity

Posted By: Sam
Subject: Null Exception when creating an entity
Date Posted: 28-Sep-2011 at 5:30am

Hello,

Can someone help me?

I have a very simple model/web to Silverlight App that is functioning fine.

However; if I move the DomainModel generated code to it's own Silverlight Library project, add all the same references that are in the Silverlight Application, reference the SL library and run the same thing... When I try to create an entity (any entity), I'm getting a null exception.

e.g.

var myHero = new Hero();

Object reference not set to an instance of an object.

at IdeaBlade.EntityModel.Entity..ctor()

Any suggestions on what the issue is or where I can start looking?

Regards,

Sam.

Replies:

Posted By: sbelini
Date Posted: 28-Sep-2011 at 11:45am

Hi Sam,

If I understand correctly you are trying to have your model in a project separated from the Web project.

If that's the case, have you taken a look at the steps provided in the http://drc.ideablade.com/xwiki/bin/view/Documentation/separate-model-project - DevForce Resource Center ?

If not, could you upload a simple solution reproducing the issue?

Thanks.

Silvio.

Posted By: smi-mark
Date Posted: 28-Sep-2011 at 2:21pm

I've had this problem before. I can't quite remember what the issue was though, I think it was in a unit test project.

Is anything showing up in the debuglog?

Posted By: Sam
Date Posted: 28-Sep-2011 at 7:04pm

It's when I split the Silverlight side out, so that the Model (shared code) is in a separate SL project to the SL app.

Nothing in DebugLog other than saying it's listening.

It will connect to the server and give a IsConnected=true.

If I put the shared code in the SL app and not the SL project file, then it works fine.

Regards,
Sam.

Posted By: mseeli
Date Posted: 29-Sep-2011 at 7:07am

I am struggling with a similar problem:

CodeEntity is a DevForce Entity

CodeEntity ce = new CodeEntity();

causes a null reference exception.

All I want to do is to create a new empty CodeEntity.

Without attaching it do a manager or accessing a database

Could it have something to do that I try to do that in a console application

and I only have DevForce for Silverlight?

The same code works fine in Silverlight.

Posted By: sbelini
Date Posted: 29-Sep-2011 at 8:35am

Hi Sam and mseeli,

Please upload a sample solution reproducing the issue. (against NorthwindIB please)

Thanks,

Silvio.