Comments on: Projecting Onto a Presentation Model with the Entity Framework and ASP.NET MVC

By: annuaire de casinos

annuaire de casinos — Mon, 27 Sep 2010 06:49:26 +0000

can u punlish the sample application.

By: WB

WB — Fri, 10 Sep 2010 15:11:18 +0000

I laughed out loud at the Flair count property.

It’s been a long time since a code snippet has brought a smile to face and I was told I could laugh at a reasonable level in my cube.

By: Bryce

Bryce — Wed, 25 Aug 2010 05:51:13 +0000

Can you publish the complete script or ap?

By: Jim Reineri

Jim Reineri — Thu, 06 May 2010 23:55:44 +0000

I just stumbled onto this article and even tho it is over four months old I do have a question/comment.
Is it not true that it is actually LINQ that is responsible for the ease of creating the projection and not Entity Framework? It seems that LINQ could be used in this way with LINQ to Objects, LINQ to XML etc. Without EF at all.

By: NW

NW — Tue, 26 Jan 2010 20:30:07 +0000

I’m having an issue trying to project on to a presentation model where a parent object has a list of references to child objects. Let’s say I have a Parent entity and a Child entity, and in the storage model, each Child has a reference to a single parent. In my presentation model, I want a PresentationParent to have a List. I’m trying to construct this with a query like so:

from p in entities.Parent select new PresentationParent { ID = p.ID, Name = p.Name, Age = p.Age, Children = (from c in p.Children select new PresentationChild { ID = c.ID, Name = c.Name, Age = c.Age }).ToList() }

I get an exception at runtime when I try to enumerate the results that LINQ to Entities "doesn’t recognize" the ToList() method. It works fine if I’m using LINQ to SQL. Is there a way to do this using LINQ to Entities?

Response: Your ToList is in the wrong place. Try:

from p in entities.Parent select new PresentationParent { ID = p.ID, Name = p.Name, Age = p.Age, Children = (from c in p.Children select new PresentationChild { ID = c.ID, Name = c.Name, Age = c.Age }) }).ToList();

By: J.W.

J.W. — Tue, 05 Jan 2010 13:10:36 +0000

Hi, Graig, do you have a sample application that can be downloaded?

Response: Not yet. Soon, though.