Comments on: Updates to – Putting Entity framework 4 to use in a business architecture http://daniel.wertheim.se/2009/12/20/updates-to-putting-entity-framework-4-to-use-in-a-business-architecture/ Love what you do - Continue to do it - Be eager to learn more about it. Tue, 24 Jan 2012 07:50:22 +0000 hourly 1 http://wordpress.com/ By: Daniel Skinner http://daniel.wertheim.se/2009/12/20/updates-to-putting-entity-framework-4-to-use-in-a-business-architecture/#comment-409 Tue, 25 May 2010 10:21:30 +0000 http://daniel.wertheim.se/?p=193#comment-409 You need to specifically map the relationships:


Relationship(c => c.Students)
.FromProperty(student => student.Classes)
.Map("dbo.ClassRegistrations", (student, class) => new
{
student.StudentId,
class.ClassId
});

The major drawback I found is that both navigation properties must exist in the Domain model i.e. Student.Classes and Class.Students. If Student.Classes doesn’t make sense in your domain, you still need to expose the property. Hopefully this will be fixed in later releases.

Code first is nice but there are actually quite a lot of constraints placed on the design of classes.

]]> By: Daniel Skinner http://daniel.wertheim.se/2009/12/20/updates-to-putting-entity-framework-4-to-use-in-a-business-architecture/#comment-408 Tue, 25 May 2010 10:12:50 +0000 http://daniel.wertheim.se/?p=193#comment-408 I am able to map protected properties using the ObjectAccessor class:

Property(ObjectAccessor.CreateExpression("StatusString"));

However, if I wish to specifically Map the table using a similar notation:

MapSingleType(i => new
{
i.ConcurrencyToken,
i.Id,
i.Name
StatusString = ObjectAccessor.CreateExpression("StatusString"),
});

I get a runtime exception. Is it possible to specifically use MapSingleType with protected properties?

]]> By: Entity framework 4 – CTP3 – Code first vs Linq to Sql « Daniel Wertheim http://daniel.wertheim.se/2009/12/20/updates-to-putting-entity-framework-4-to-use-in-a-business-architecture/#comment-382 Sun, 16 May 2010 12:39:54 +0000 http://daniel.wertheim.se/?p=193#comment-382 [...] by Daniel Wertheim Leave a Comment I just started doing some architectural changes to my old code in my previous article for Entity framework 4 (EF4) and at the same time updating it to use the new CTP3 add-on as well as [...]

]]> By: Silverlight, WCF, Entity Framework 4 ALL IN ONE « HD BKHN Blog http://daniel.wertheim.se/2009/12/20/updates-to-putting-entity-framework-4-to-use-in-a-business-architecture/#comment-377 Thu, 13 May 2010 09:58:15 +0000 http://daniel.wertheim.se/?p=193#comment-377 [...] Data of EMDS is stored in Microsoft SQL Server and XML files. For accessing XML files, I use Linq to XML. For accessing database, I use EF4 beta 2 and applying its new feature POCO support. I want to say thank you to I want to say thank you to Daniel Wertheim, the man providing us very helpful framework of EF4 POCO (http://daniel.wertheim.se/2009/12/20/updates-to-putting-entity-framework-4-to-use-in-a-business-arch...). [...]

]]> By: Daniel Wertheim http://daniel.wertheim.se/2009/12/20/updates-to-putting-entity-framework-4-to-use-in-a-business-architecture/#comment-343 Mon, 26 Apr 2010 10:51:06 +0000 http://daniel.wertheim.se/?p=193#comment-343 Hi,
It was I while since I sat down with this so I have no answer that comes directly out of my head. I guess it will go faster to google it or check the ADO.Net Team blog. I’m currently starting a project where I will use EF4 code-first so eventually I will have an answer for you.

//Daniel

]]> By: Daniel Skinner http://daniel.wertheim.se/2009/12/20/updates-to-putting-entity-framework-4-to-use-in-a-business-architecture/#comment-333 Fri, 23 Apr 2010 12:14:15 +0000 http://daniel.wertheim.se/?p=193#comment-333 How do you deal with many-to-many relationships in this architecture?

]]> By: Entity framework 4 – Code first « Daniel Wertheim http://daniel.wertheim.se/2009/12/20/updates-to-putting-entity-framework-4-to-use-in-a-business-architecture/#comment-183 Mon, 22 Mar 2010 07:42:21 +0000 http://daniel.wertheim.se/?p=193#comment-183 [...] a comment » I haven’t got the time to update my previous article to the new CTP-addon for supporting Code-first (old name Code-only). My goal is to start covering [...]

]]> By: Ashraf http://daniel.wertheim.se/2009/12/20/updates-to-putting-entity-framework-4-to-use-in-a-business-architecture/#comment-166 Fri, 19 Mar 2010 01:13:26 +0000 http://daniel.wertheim.se/?p=193#comment-166 Hi Daniel,

It seems to me that if I use a IoC I should not use using() syntax.

Example if i set IoC scope as Singleton …
using (IEntityStore store = IoC.Invoke())
{
} // here store call parents dispose so it release its resources example connection.

Here dispose is the responsibility of IoC not the client. Since we use using .net call disposes method.

thanks for the project. it’s really wonderful.

]]> By: Daniel Wertheim http://daniel.wertheim.se/2009/12/20/updates-to-putting-entity-framework-4-to-use-in-a-business-architecture/#comment-155 Wed, 17 Mar 2010 08:44:54 +0000 http://daniel.wertheim.se/?p=193#comment-155 ThreadLocal – A single instance will be created for each requesting thread. Caches the instances with ThreadLocalStorage.

//Daniel

]]> By: Daniel Wertheim http://daniel.wertheim.se/2009/12/20/updates-to-putting-entity-framework-4-to-use-in-a-business-architecture/#comment-154 Wed, 17 Mar 2010 08:00:37 +0000 http://daniel.wertheim.se/?p=193#comment-154 Hi,

First of all, I think there are a lot of improvements to do to the architecture, especially how I handle the IoC concept. A better implementation for this could be found: http://daniel.wertheim.se/2010/03/14/linq-to-sql-how-to-separate-the-entities-and-the-datacontext/

Also note that there is a new version of the CTP (v3), and the article has not been updated for it.

As for the error you get, I have to look this up. Hopefully during the day. It seems like the Resolve method doesn’t give you a new EntityStore each time, hence the first using-statement will dispose it.

//Daniel

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