Entity Framework Core - Knowledge Base (KB)
6642 results for:
How do I make a group of multi-select checkboxes in ASP.Net MVC with c# enum?
I need to make a set of checkboxes where a user can select 1 or more markets. I would normally use a set of boolean values to accomplish this as it would be pretty strait forward and in my mind not take up much space in the database or take that long to l...
asked by Bob
Generic Repository EntityFramework 6 Implementation
I have been assigned a new project and I have decided to give EF a go.In this project all I do is getting data there is no persistence.I have to implement some caching and that's it....Reading about Repository patterns I have found tons of code samples et...
asked by user9969
Save detached entity in Entity Framework 6
I've read through LOTS of posts on saving a detached entity in Entity Framework. All of them seem to apply to older versions of Entity Framework. They reference methods such as ApplyCurrentValues and ChangeObjectState which do not seem to exist. On a whim...
asked by KingOfHypocrites
Unable to find the requested .Net Framework Data Provider. It may not be installed
This morning I suddenly got this exception when trying to add a custom migration step to our EF Code-first migrations:...The ADO.NET provider with invariant name '.NET Framework Data Provider for SQL Server' is either not registered in the machine or appl...
asked by Jesper Lund Stocholm
Problems using Entity Framework 6 and SQLite
I'm trying to use Entity Framework with SQLite. I had issues integrating it into my main application, so I started a little test from scratch, exactly following the directions on ...http://brice-lambson.blogspot.com/2012/10/entity-framework-on-sqlite.html...
asked by Xcelled
EF6 Code First Pluralizing Tables Invalid Object Name
EF6 is pluralizing my Code First table names no matter what I do. I am getting the error that it can't find the pluralized table {"Invalid object name 'dbo.TestStats'."}. The table is singular in the DB as dbo.TestStat...I tried removing the convention by...
asked by Shiloh
EF 6 - Cascade Delete on one to many without backreference
I have something like this:...public class Gadget { public int Id { get; set; } public string Name { get; set;} public int SuperHeroId { get; set; } } public class SuperHero { public int Id { get; set; } public virtual ICollection<Gadget> Gadge...
asked by George Mauer
EF 6 database first: How to update stored procedures?
We are using ...Entity Framework 6.0.0... and use database first ...(like this)... to generate code from tables and stored procedures. This seems to work great, except that changes in stored procedures are not reflected when updating or refreshing the mo...
asked by Halvard
Six seconds warmup time for the first entity framework 6 nonquery
From my integration test:...// Act Stopwatch w = new Stopwatch(); w.Start(); userService.Create(userDTO); w.Stop(); public void Create(UserDTO userDTO) { var user = userDTO.ToEntity(); _context.Entry(user).State = EntityState.Added; _context...
asked by Pascal
Issue with many-to-many relationship + TPH inhertitance in Entity Framework 6
I am running into an issue with EF6, though I'm fairly sure that this applies to previous versions that support this type of mapping. I fear I know the answer to the question at hand, but I hope that I am doing something wrong, or there is a better workar...
asked by joelmdev
DbContext cached data
I read everywhere that the proper way to get fresh data from the database is to create a new instance of DbContext, and drop the existing. While this may be obvoius for some scenarios, I am finding difficulties to implement this in a more complex scenrari...
asked by Goran
Trying to use migrations in a project other then the startup project results in error
Hi I am trying to take advantage of Entity Framework migrations but when I add this command:...PM> Add-Migration...cmdlet Add-Migration at command pipeline position 1...Supply values for the following parameters:...Name: CodeArtMigration...I get back this...
asked by aleczandru
EF 6 IsRequired() allowing empty strings
In past projects with versions of EF5 and EF4, the IsRequired() fluent API method would thrown a DbEntityValidationException if the property was null or an empty string. In my current project utilizng EF6, The DBEntityValidationException is not thrown wh...
asked by awolske
Multi-async in Entity Framework 6?
This is my code:...var banner = context.Banners.ToListAsync() var newsGroup = context.NewsGroups.ToListAsync() await Task.WhenAll(banner, newsGroup); ...But when i called the function from controller. It showed error...A second operation started on this c...
asked by An Hv
Entity Framework Seeding with Identity (Microsoft.Owin.Security) user
I have a class that seed the database which add 2 users with roles and custom fields. The problem I have is that it save the data in [dbo].[AspNetUsers] instead of [dbo].[IdentityUsers]. Both tables are created. When seeded, the data go into AspNetUser. W...
asked by Patrick Desjardins
Could not load type 'System.ComponentModel.DataAnnotations.DatabaseGeneratedOption' from assembly 'EntityFramework' error
I have an ASP.NET application which works fine using EntityFramework 4.3. I have it now use EntityFramework 6.0.2 instead. Now I am getting the error below at a line in the OnModelCreating code....Why am I getting this error? Why is it looking for Databas...
asked by Tony_Henrich
How to pre-compile my EF Views
Here is the story : I had a huge MVC 2 website using Entity Framework 4.0 and a few days ago, I decided to upgrade MVC 2 => MVC 4 and EF4 => EF6 and .NET Framework 4.5....I did that on a project containing about 150 controllers and more than 300 entities....
asked by Jean-Francois
Mapping a long data property to int in database
In all of the examples that I've seen use ...int32...s as the IDs. That's not always practical in production environments. Several of our databases have identity IDs that are in the realm of ...int64...s, so our practice is to always use ...long... for ou...
asked by krillgar
EF6 - TPH foreign key mapping in derived classes using base class property
I am using Entity Framework 6.0.2 with an existing database in which tags are stored in a single table that looks like this:...Id...: int, primary key ...TagType...: string, determine the type of tag, either "usertag" or "movietag"...ItemId...: int, c...
asked by Erik Schierboom
Foreign key issues in EF6 CF
Excuse me for being a noob with EF when it comes to code first. My problem is I don't want to add foreign key properties to the model and according to MSDN this presents no problem using the fluent API, however I can not figure out the correct use for my ...
asked by weagle08
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