Trying to use Visual Studio 2012, Entity Framework 5.0 database first approach to generate my edmx.
When I generate the EDMX from the database VS 2012 - says
Successfully registered the assembly 'System.Data.Entity, Version=4.0.0.0;
web.config file as well says
<add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral.../>
I see EntityFramework and System.Data.Entity both listed in the references. EntityFramework shows up in the packages folder and System.Data.Entity points to the .NET 4.5 install folder. Does this mean that I am succesfully using EF 5.0?
For existing project migrations - when I migrate a project from VS 2010 .NET 4.0 and set the .NET client profile to 4.5 the System.Data.Entity assembly gets upgraded to the one in .NET 4.5 install folder. I do not see the EntityFramework.dll at all. Are there any changes I would need to make in order for my existing project to mgirate to EF 5.0 and .NET 4.5
Am I missing something here?
The version of System.Data.Entity.dll assembly is the same on both .NET Framework 4 and .NET Framework 4.5. The catch is that only one version can be installed on a machine at the same time so even if you target .NET Framework 4 in your project but run your app on a machine with .NET Framework 4.5 you will effectively run it against .NET Framework 4.5 (and therefore the EF5 version of System.Data.Entity.dll assembly).
With regards to EntityFramework.dll - up to the version 6 it was build on top of System.Data.Entity.dll (in EF6 the code from System.Data.Entity.dll and EntityFramework.dll was merged and further evolved). If you used EntityFramework.dll in VS2010 it means that it had to be one of the 4.x versions which were EF4. You could continue to use it even with the EF5 version of System.Data.Entity.dll but you will not be able to take the advantage of new features introduced in EF5 (like enums, spatial etc.). Since you decided to move to .NET Framework 4.5/EF5 you should also update your EntityFramework.dll 5.0.0.0. To do that you have to install the NuGet extension (http://docs.nuget.org/docs/start-here/installing-nuget) if you have not already and just install EntityFramework.dll using the package manager console (http://www.nuget.org/packages/EntityFramework/5.0.0). It should replace the 4.x version you have in your project with 5.0.
Related
I'm having issues when creating an API Controller in .NET 5.0 with Entity Framework Core.
Here's what I'm doing:
I'm using .NET 5.0
Installed the Entity Framework Core packages and all 3 have the version 5.0
The model and DataContext classes have already been created and using them had already created a table in the database earlier
However when I right-click on the API project, click on Controller > Select "API Controller with actions, using Entity Framework" > Select "Model Class" & "DataContext class" > Enter the name of the controller
I keep getting the error
There was an error running the selected code generator: Package restore failed. Rolling back the changes for API
Troubleshooting done:
Cleared the NuGet Cache in Tools > Options > NuGet Package Manager > Clear All NuGet Cache(s)
Made sure that the Entity Framework Core packages and the .net version are the same in the .csproj
What am I missing here that is causing the issue?
If you have installed the latest version of Microsoft.VisualStudio.Web.CodeGeneration.Design package, you probably got version 5.0.2. That package cannot generate code based on Entity Framework Core packages of version 5.0.0.
From my experience - to generate EF Core based code, the version of your Design package should be equal to or less than the version of your EF Core packages. So, you need to either upgrade the EF Core packages, or install the version 5.0.0 of the Design package.
EDIT:
I faced the same issue and it was resolved after upgrading the EF Core packages, which is 5.0.4 currently, and installing the latest Design package, which is 5.0.2 currently.
In my case to generate EF core based code, i need to installed version 5.0.13 of Microsoft.EntityFrameworkCore and version 5.0.12 of Microsoft.EntityFrameworkCore.SqlServer and Microsoft.EntityFrameworkCore.Tools
and version 5.0.2 of Microsoft.VisualStudio.Web.CodeGeneration.Design
Note:- Make sure to clear Nuget Cache
I have an existing .NET Framework-based solution that I'm migrating to .net 5.0. I'm not migrating data access just now: we'll keep using EF6 model-first. After converting projects to .net 5.0 I've tried opening the .edmx file only to get a message:
The Entity Data Model Designer is unable to display the file you requested.
The Entity Framework is not available in the target framework currently specified for the project. You can change the target framework of the project or edit the model in the XML Editor.
The target framework is net5.0.
Should this work?
No, as per EF docs:
There's currently no support for using the EF designer directly on
.NET Core or .NET Standard projects or on an SDK-style .NET Framework
project.
Thanks to #ErikEJ for a detailed walkthrough of a workaround.
I have added .Net Standard Library 2.0 and I have installed EntityFramework 6.4.0 via NuGet Package manager, But unable to inherit DbContext in my class because System.Data.Entity is not available. What should I do to use DbContext?
As #magicandre1981 said, you need to upgrade to .NET Standard 2.1.
I hate all these hidden version incompatibilities! We had EntityFramework 6.2 running in a .NET Standard 2.0 project. Updating EF produced no version incompatibility warnings, even though if you look closely from EF 6.3+ it requires .NET Standard 2.1.
Edit: And the calling project is Framework 4.8, which does NOT support .NET Standard 2.1. So it's back to EF 6.2 and .NET Standard 2.0 for me.
I am rather confused about the behaviour of Nuget Package manager and Entity Framework. As far as I have been seraching, Entity Framework supports only version 3.5 in .NET 3.5 (which was shipped with the .NET SP1). However, when I run Nuget Package it offered me to install EF 5 and today (upgrade to) EF 6.0.1. I am using Visual Studio 2010 and the project is a class library with target framework .NET 3.5.
My questions:
a) Can you use EF 5 or 6 with .NET 3.5? - My answer is no as well as some other answer in here.
b) How is it possible that Nuget offers me to download these versions?
c) I downloaded EF 5 with Nuget and it worked. How is that possible? (Even on EF website they say it is only for .NET 4.0 and higher)
We, the Entity Framework team, decided not to fix this issue (See Work Item 1341)
Only the version of System.Data.Entity.dll that ships with .NET Framework 3.5 will work with projects that target .NET Framework 3.5.
I am confusing if entity framework 5 is based on .net framework 4.5 or .net framework 4.0 in my project, because when I added ef5 to my project from nuget, it shows the run time version is v4.0.30319 as in attached image. (I assume it should be v4.5.50709?)
In the project settings, the targeted framework is correctly set to .Net Framework 4.5 and I am using visual studio 2012.
If it is not using .net framework 4.5. How I can do to make sure it is using .net framework 4.5? Thanks for your help.
There is no 4.5 Runtime. The 4.5 Framework is built ontop of the 4.0 Runtime and CLR. What you are seeing is expected.