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EF: Another (better ?) way to deal with POCO entities

If you want to have POCO entities and to keep at the same time, the context features like tracking, attaching automatically relationships, Lazy loadings, EF will generate a proxy which inherits your entity classes and which adds some code to do it. This is the same idea than in N-Hibernate. However,...

Posted to Matthieu MEZIL by Matthieu MEZIL on Wed, Dec 30 2009
Filed under: Filed under: .Net, MSIL, Entity Framework (EF), Architecture
Self-Tracking entities: How to reduce exchange between client and server?

Self-Tracking entities are really great for N-Tiers scenarios but we have to be careful in order to reduce exchange between client and server. Imagine the following EDM: and the following scenario: using ( var context = new NorthwindClientContext ()) { var c = context.Categories.AsQueryable...

Posted to Matthieu MEZIL by Matthieu MEZIL on Mon, Dec 21 2009
Filed under: Filed under: .Net, Entity Framework (EF), Entity Data Model (EDM), T4
EF and N-Tiers

Even if it’s really easier with Self-Tracking entities and EF4, a difficult point remains in N-Tiers scenarios. In a previous post , I explained how with T4, I can generate all my WCF service. Now, what about the client tiers? I explained how can I use LINQ queries and translate them into WCF service...

Posted to Matthieu MEZIL by Matthieu MEZIL on Sat, Dec 12 2009
Filed under: Filed under: .Net, Entity Framework (EF), Entity Data Model (EDM), T4
Data oriented WCF service Agile with EF4 and a “sort of” provider LINQ

I use a different approach than Julie’s one for EF Agile development. Indeed, I use here Self-Tracking Entities and I massively use T4. The first step is to create a project DAL in which we will add an edmx. In my sample, I use Northwind DataBase with only the Customers, Orders and [Order Details] tables...

Posted to Matthieu MEZIL by Matthieu MEZIL on Tue, Nov 24 2009
Filed under: Filed under: .Net, Entity Framework (EF), Entity Data Model (EDM), Architecture, T4, TDD, LINQ
4 in 1: EF won’t fire DBAs, Velocity, SQL CLR and SQL Dependency

Imagine that we have a table Cars with a PK Id (nvarchar(8)) based on the following regex pattern [1-9][0-9]{1,2}[A-Z]{2,3}[0-9]{2}. The last two numbers are a region code. The increasement is done like this: 10AA[region], 11AA[region], …, 999AA[region], 10AB[region], …, 999ZZ[region], 10AAA[region]...

Posted to Matthieu MEZIL by Matthieu MEZIL on Sat, Nov 21 2009
Filed under: Filed under: .Net, Entity Framework (EF), Entity Data Model (EDM), SQL, Architecture, Velocity
ADO.NET Data Services Client context

One of the great points with EF is the eco-system around it. Even if it can be used without EF, I think that ADO .NET Data Services is one of the technologies in this eco-system. Indeed, using ADO.NET Data Services with EF implies almost no code to write some LINQ queries in the client tier or to save...

Posted to Matthieu MEZIL by Matthieu MEZIL on Wed, Nov 4 2009
Filed under: Filed under: .Net, Entity Framework (EF), Entity Data Model (EDM), ADO.NET Data Services, T4
Generate a WCF service from an edmx with T4 v2

I recently published a T4 template to generate a WCF service . I updated it to be able to load its relationships from an entity . When the template is written (what I’ve already done), it generates the WCF service for us (you just have to set the end point in the config file). As I explained in...

Posted to Matthieu MEZIL by Matthieu MEZIL on Mon, Oct 26 2009
Filed under: Filed under: .Net, Entity Framework (EF), Entity Data Model (EDM), T4
Entity Framework: the productivity way

One of the best points with Entity Framework is the developer productivity gain. If you associate EF with the T4 template code generation, this gain explodes. Imagine that we want a WCF service which exposes some data. For each entity type, you probably want a Get method which returns the entities, perhaps...

Posted to Matthieu MEZIL by Matthieu MEZIL on Tue, Oct 20 2009
Filed under: Filed under: .Net, Entity Framework (EF), Entity Data Model (EDM), WCF, T4
EF: Include with where clause

Several guys ask me if it’s possible to add a condition in the Include method and the answer is no. However you can do an equivalent like this: from cWithP in ( from c in context.Categories select new { ...

Posted to Matthieu MEZIL by Matthieu MEZIL on Wed, Oct 7 2009
Filed under: Filed under: .Net, Entity Framework (EF), Entity Data Model (EDM)
I need you!

I submitted one Birds of Feather session for the next Tech Ed in Berlin. My session submission depends on your votes . I think that you will find by yourselves which is my session Thanks by advance for your votes

Posted to Matthieu MEZIL by Matthieu MEZIL on Sat, Sep 26 2009
Filed under: Filed under: .Net, Entity Framework (EF), Entity Data Model (EDM), Tech Ed
ADO.NET EntityObject Generator: how to get the EntityType’s EntitySet and how to get EntitySet’s EntityTypes?

One of my customers wanted to know how to get all EntityTypes for an EntitySet in his T4 template based on the MS ADO.NET EntityObject Generator one. So I made a POC for him. What do I do? I change two classes included in the template (my changes are in bold): private class EntitySetObjectSetPropertyWrapper...

Posted to Matthieu MEZIL by Matthieu MEZIL on Wed, Sep 2 2009
Filed under: Filed under: .Net, Entity Framework (EF), Entity Data Model (EDM), T4
PFx is good

I am sure that the Parallel Framework (PFx) will take more and more importance in future developments. However, demos often are not in phase with the reality. It’s true that a fractal demo on a 1000 cores machine is ideal for parallel demo, however in real life, I never used the fractal yet and I don...

Posted to Matthieu MEZIL by Matthieu MEZIL on Tue, Sep 1 2009
Filed under: Filed under: .Net, C#, Entity Framework (EF), PLINQ TPL
How to have FK in EF v1?

Before answering this question, I will start with another one: why do we need FK? to be able to change a relationship without loading the related entity but we can already do it with the EntityReference property. for the binding With the windows forms ComboBox, we don’t need it because you don’t have...

Posted to Matthieu MEZIL by Matthieu MEZIL on Tue, Jul 21 2009
Filed under: Filed under: .Net, C#, Entity Framework (EF), T4
T4 for View Generation

EF team blogged about it here and I think that it’s very useful. First, I think that it’s easier to use than Edmgen. Moreover, contrary to EdmGen, it allows you to use embedded metadata artifacts. If you want to use the MS T4 template with VS 2010, don’t forget to change the xml namespaces...

Posted to Matthieu MEZIL by Matthieu MEZIL on Mon, Jun 29 2009
Filed under: Filed under: .Net, Entity Framework (EF), T4
POCO T4

With EF4 features CTP1, we have a great POCO template which is divided in two tt files to allow us to have the entitiy POCO classes and the context in different projects. It’s very very cool. However, I think that it’s a shame not to have an interface for the context particularly to mock...

Posted to Matthieu MEZIL by Matthieu MEZIL on Fri, Jun 26 2009
Filed under: Filed under: .Net, Entity Framework (EF), T4, TDD
SubObjectSet

With EF, when you use TPH or TPC inheritance mapping scenarii, the EntitySet is on the base class. As I mentioned often in the past with EF v1, you can add a property in your context which returns the EntitySet.OfType<MySubType>(). Ok it’s interesting but… In EF v1, the EntitySet is...

Posted to Matthieu MEZIL by Matthieu MEZIL on Tue, Jun 16 2009
Filed under: Filed under: .Net, Entity Framework (EF)
Entity Framework v2: How to get only one entity easier with EF4

Alex James wrote an extension method which allows to get only one entity from a query and the entity key . If we have the key, I think it’s useless to allow it for all queries and it’s useful only for EntitySet. With EF4, this extension method can be applied on ObjectSet class instead of...

Posted to Matthieu MEZIL by Matthieu MEZIL on Fri, Jun 12 2009
Filed under: Filed under: .Net, Entity Framework (EF)
Entity Framework: Undo Redo v2

After my first Undo Redo POC version , one of my customers wanted to be able to manage many actions per Undo / Redo. So I added two extension methods: BeginGroupOfUndoActions and EndGroupOfUndoActions. My code is now this one: public static class ObjectContextExtension { private static Dictionary <...

Posted to Matthieu MEZIL by Matthieu MEZIL on Wed, Jun 10 2009
Filed under: Filed under: .Net, Entity Framework (EF)
EF : Undo Redo

How to use Undo/Redo with EntityFramework? This isn’t managed by EF. So we will have to do it ourselves. We could clone the entities and group them into a Stack but in this case I worry about my memory usage growing too much. So I prefer another solution with Action. Note that for this POC, I just...

Posted to Matthieu MEZIL by Matthieu MEZIL on Mon, Jun 8 2009
Filed under: Filed under: .Net, Entity Framework (EF)
How to split your EDM v2?

After my previous post about it , my customer asks me the following question: how to get a complete graph (with categories, suppliers, products, order details, orders, customers and employees)? To realize it, we have to add “sort of” navigation properties for the entities like this: private...

Posted to Matthieu MEZIL by Matthieu MEZIL on Tue, Jun 2 2009
Filed under: Filed under: .Net, Entity Framework (EF), Entity Data Model (EDM)

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