Architecture :: Entity Framework With 3 Layers Design

May 19, 2010

I am thinking to use entity model as DAL, how should I create the BLL then? What kind of datasourceobject should I use in the asp pages?

I am looking for best practice to use Entity framework 2 in the three layers design. I had experience at dataset with three layers design.

Should I use objectdatasource at the pages for gridviews? My guess is that entitydatasource by passed the BLL which is not good, so the only option left is the objectdatasource.

Could and should my BL object inherit those entity model in the DAL, so I dont need to recreate their object's property?

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So, as the title says, I'm having trouble trying to model my application. I'm like an OOP newbie. I'll show my classes first and then I'll write my questions.

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[Code]....

So, model layer is pretty simple. Just a user representation. On the Data Access Layer I have a basic class with a GetConnection method. All DAL classes will extend this one.

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Btw, please assume I can't use TableAdapters and stuff like that. I would like to create all layers by myself.

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I'm trying to write a web app using 4-tier design pattern ( Data Store, DAL, BLL and UI).
Among other things this app would also implement a forum.

Suppose I want to move a thread from one forum to another. In order to do this, UI layer must pass down to other layers the ID of a thread and the ID of a forum to which I wish to move this thread ( UI would pass these parameters by calling method A in BLL layer and A would in turn call method B in DAL layer... ).

a) Now should one of the bottom layers provide some sort of checking mechanism to ensure that the two ID arguments supplied by UI layer really represent an existing thread and an existing forum or is it the responsibility of UI layer to provide valid ID values?

EDIT:

I would consider the ability to pass invalid IDs a bug.

Should non existing ID be considered a bug just in the case of moving a thread, or also in the case of displaying a thread. Thus when user navigates to page Showthread.aspx?ID={0}, if query string parameter ID references non existing ID, If none of the layers check for the validity of ID, then GridView simply won't display any

"But in this case it doesn't look like the ids are in any sort of list. If they were one could only assume that this would never happen as I assume the lists would be populated by a stored procedure or a DAL procedure that pulls all valid IDs."

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I'm a junior programmer, i do not get the concept of MVC! My method of coding is seperating my application design into 3 layers:

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I decided to have this book to help me have a better idea on code design:

http://www.amazon.com/Professional-ASP-NET-Design-Patterns-Millett/dp/0470292784/ref=sr_1_1?ie=UTF8&qid=1292836936&sr=8-1

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I doubt how to implement the layers
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In the database, there is the 3 tables, as described above.how do I implement the facade, bll and dal? only one class for 3 DTOs?

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ADO.NET :: Entity Framework With Stored Procedure Versus Entity Framework Without Stored Procedures

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I am new to entity framework , it is really very good , but I want to know what is the difference between using entity framework with stored procedure or without stored procedure , which one the faster and what is the benefits for using stored procedures with entity framework.

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I'm using ASP.NET with VB.NET. Where in my code do I put the hook to say, "update the history entity" and what should that hook look like?

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