Looking for the simple layered example that uses code first and repository, with either winforms or WPF (no ASP.NET).
I did not realize it is such an unusual question. Does anybody know of any example? I would like to use entity framework code first in layered project, but all samples I could find use ASP.NET (not familiar with), or use .edmx file, or are a simple console project. I can not connect the dots on how to actually make it work, and simple example would really help.
You can start by this one, EF Code First and WPF with the Chinook database
Follow it up by this ONE
Related
I'm starting a project and already check how useful is gobuffalo/pop.
I have never previously used a framework for my GO projects. I just used the stdlib and I'm used to working with Django too.
In Django it is pretty straight forward to create/update a model and generate its migrations. It gets the current DjangoModel and generates a migration with the changes. What a surprise to me when I can't find how to do it with pop.
I already checked the documentation but I couldn't find any examples.
How do you do that?
Right now, you can only generate empty migrations and write them yourself: https://gobuffalo.io/en/docs/db/migrations#writing-migrations
There's an issue asking to implement a Django-like migrations generator (https://github.com/gobuffalo/pop/issues/184), but it's not done yet and requires a lot of work.
As we are working on the refactoring of our current legacy code which is in Database first(EDMX files). We have decided to move on Code First approach, but moving edmx to Code First in a single go would create a lot of testing effort. Is there any way to run EDMX and Code First logic simultaneously in a single project for a time being (Planning to move few classes not completely in a single go).
Please suggest.
I use Visual Studio 2013 and need to use Entity Framework code first approach in a project. I used NuGet Manager to install EF v6.1 into my project. But I can't create an empty code first model or even a code first model from database although there are two other choices (DB first and Model first).
How I can add Entity Framework code first feature to my project?
Here is a beginners tutorial for using entity framework code first:
An Absolute Beginner's Tutorial for understanding Entity Framework's Code First Approach in ASP.NET MVC
After adding an entity model either from the datasources toolbox itself or by adding it => "add" => "new item" it does not show up in the datasources toolbox and therefor i dont get that easy drop and drag functionality.
If I add a dataset it works but that is an older technology (is it not?) everything in my current project are entity models and to change to datasets (which only works if I add xmlns:yourAlias="clr-namespace:WpfApplication3") would be .. I don't think best practice and a waste of time.
I have recreated this same process of adding a entity model in VS 2010 and it works 100%, where i have the ability to simply drop and drag from the dataSource toolbox
Maybe ill just wait for VS SP1 before working with it for client projects. :(
//Edit
If I add the ADO.net Entity model in VS2010 and then load the project in 2012 it loads fine in the dataSource toolbox. This is an answer but not an ideal work around.
While working on a project I recently faced the same problem. It took me about two days of extensive research but I think I've finally found it:
http://msdn.microsoft.com/en-us/data/jj556581
At least for me it solved the problem. Please let me know if it helped you..
Being addicted to L2S, I tried to get familiar with VS2012 and EF5. But I nearly lost my nerves trying to use the data sources toolbox.
Finally I found a solution:
using Object Data Source is now the recommended approach for using EF in databinding scenarios. See this article for more details - http://msdn.microsoft.com/en-us/data/jj574514. The article also includes a link to revert to the old code generation if that is what you desire.
I've a project using code first approach and EntityFramework 5.0 and im willing to add tracing but haven't gone far, i've read this link but im unable to make it work using DbContext approach. Original EF Tracing/Caching was written using ObjectContext and after reading thru lots of pages i still can't figure out how to make it work properly. In the link provided above, i'm getting an error not finding NorthwindContext.
Can someone provide some insight on where and how to compile a working solution using EFTracing with DBContext? A code Sample would be a huge help.
Thanks,
Ricardo
There are some hoops you need to jump through. I blogged about this here: http://blog.3d-logic.com/2012/03/31/using-tracing-and-caching-provider-wrappers-with-codefirst/. Hopefully it will help you resolve your problem.
EDIT
EF6 now contains a built-in mechanism for logging/tracing. From more details see the feature specification and this blog post.