I built an application with target framework .NET 4.6 using MVC 5 and Entity Framework 6 using Visual Studio 2017 on my Windows 7 machine. I'm now being told that I should have built the application to target .NET 4.0 because the production environment only has 4.0 installed. So I changed the target framework to 4.0 but now the application will not build on my machine.
I'm guessing I also need to downgrade MVC and EF. How is the proper way of doing this?
And which versions of MVC and EF should I install?
Do I need to make any manual changes to web.config?
There is no "proper" way, you have 3 options, in my favorite order:
Update the server and install the latest .net version. (at the time .net 4.6). Make sure used libraries are up to date and not end of life.
Start over in a new project and make sure you target version 4.0: you can copy most of your source files. You'll probably get some compiler errors, but usually they are easily fixed. This way you'll have the benefit that the used template matches the framework and packages version(s).
Re-target the used framework in the project properties and replace the packages which are installed and hope for the best (sometimes you need other packages). Hopefully you used the package manager to install those packages. Maybe the update-packages command helps, but be sure to backup your project first. Some packages become obsolete after time, some are renamed. This is what will cause issues. Also, some of the Methods/API calls will be different, so some rework will be needed.
As for the rest of your questions:
I'm guessing I also need to downgrade MVC and EF. How is the proper way of doing this?
Use the nuget package manager
And which versions of MVC and EF should I install?
The nuget package manager will fix this for you.
Do I need to make any manual changes to web.config?
Sometimes: yes.
Related
I was looking for some NuGet updates about my project libraries. I see that there are a lot of Microsoft libraries update to v5.0.0.
Based on my knowledge I think these are new dependencies released with .Net 5.0 and I'm not sure that I can update these libraries to latest version using .Net Core 3.1 project.
Can I update to v5.0.0 libraries even if I'm using/building a .Net Core 3.1 project?
Unfortunately, you cannot update many of these newest Nuget packages to 5.0. The reason being is that the newest Nuget package versions are written primarily for .NET 5, and often times Nuget Package Manager will even prevent you from installing them since there are differences in the APIs. With that said, there may be a few spots where it will allow the installation, but I wouldn't recommend it if you plan to keep the application on .NET Core 3.1. Most likely it could cause some inconsistencies that would be hard to debug. Proceed with caution, or upgrade your projects to .NET 5.
I just finished the same. I had 3.1 core application with a lot of 3.1 and NET Standard2.0 libraries projects and just updated all these libraries to the version 5. All libraries were working ok, I could compile them. But I couldn't compile my main Web application. It started to give some strange errors that some staff needs .net5. Maybe it could be fixed but I didn't see much sense to waste my time since in any case I was planning to move to net5 in a couple of days. So I just decided to move to net5 immediately. I had installed net 5.0 SDK and change target framework of my application to net5.0. Now everything is working fine and I am happy with my net5.0 application. I have some Net 4.8 projects that use the same common libraries that I am using for Net Core. So these common libraries are targeted to netstandard2.0. and can't change them to Net5. Now all these Standard2.0 projects still work with my net5.0 web application without any problem. Since I didn't have any problems with my previous version 3.1.9 I DON'T RECOMEND to update libraries to 5.0 if YOU DON'T PLAN to move your application to Net5.0. You can get more problems after this then you can gain from this update.
You should report such (VS for Mac and VS for Windows) as product defects to Microsoft, as many of the new 5.0 packages are targeting net5 solely, and not applicable to netcoreapp3.1.
Try to use outdated tool to check package updates, which is much more reliable,
https://github.com/dotnet-outdated/dotnet-outdated
Does OxyPlot.Wpf work on .NET Core?
My application uses .NET Framework 4.8. I am considering switching to .NET Core 3.1.5 which was released in 2020 June.
Note OxyPlot has an assembly called OxyPlot.Core but it has nothing to do with .NET Core from what information I have gathered. OxyPlot.Core is "the core library... you also need to add a platform-specific OxyPlot package". This makes it seem that OxyPlot.Wpf depends upon OxyPlot.Core and in fact if you try to uninstall OxyPlot.Core the error will be "unable to uninstall OxyPlot.Core.2.0.0 because OxyPlot.Wpf.2.0.0 depends on it". The online documentation does not seem to tell you this but fortunately NuGet will prevent the uninstall.
This means OxyPlot.Core is the core of OxyPlot and its existence does not necessarily tell you anything explicit about .NET compatibility.
I'd say yes it is compatible. Based on the nuget link https://www.nuget.org/packages/OxyPlot.Wpf
Think you Will find OxyPlot works fine with Wpf .NET Core .. but I cannot say the same for a Winforms .NET Core project I have; at the present time I am having (the usual) enormous difficulty in making it work
The NuGet.Server package is used to create a ASP.NET MVC NuGet server and it works just fine. There is another package NuGet.Server.Core that is expected to do the same when hosted within a ASP.NET Core (perhaps 1.0 or 1.1?).
The first one creates 'Packages' folder right beneath the main folder used as a package repository.
No such things happens after installing the Core version. I tried both root and a dedicated folder. Googling a bit, I found no info about installing the package and integrating it in a ASP.NET Core app.
Has anyone succeeded in installing the Core version? Also, there's another version NuGet.Server.V2 which depends on NuGet.Server.Core, however it requires .NET Framework 4.6.1. This makes me think that NuGet.Server.Core is not targetting .NET Core at all.
If so, the name must be somewhat misleading, I guess...
Yes, this is the answer:
No .NET Core whatsoever! Just .NET Framework 4.6.1. Not a big discovery but a warning to all devs who, like me, were (and, more importantly, will be!) misled by 'Core' in the package's name.
Here's a 3rd party option (free)
https://github.com/loic-sharma/BaGet
Nuget.Server.Core seems to be one of the dependencies of Nuget.Server. So it's not a .NET Core project. Guess that's one of those snags you run into when you call your framework "Core". :)
I think you can use BaGet.
There is my article about that.
Check this :
Create your own NuGet server and package feed
I'm trying to add a full framework class library as a project reference to asp.net core 2.0 MVC project and getting the below error.
Project XYZ is not compatible with netcoreapp2.0 (.NETCoreApp,Version=v2.0).
Project XYZ supports: net462 (.NETFramework,Version=v4.6.2)
I have updated to the most recent version of Visual studio i.e, 15.3.5.
Is it even possible to reference 4.6.2 libraries in core 2.0 projects?
The first thing that you can try is to compile the library you want to consume as netstandard2.0.
Theoretically (according to the .net standard documentation), this will make it compatible with projects using net461 and later as well as netcoreapp2.0 and later.
In practice, sometimes you will end up with a problem with one of your dependencies that don't provide the same library version across different compilation targets.
In such cases you may simply need to add the .net core 2.0 as a target framework for the XYZ library.
The xml tag listing the targets is <TargetFrameworks> in the XYZ.csproj file and is not handled by the Gui of the project's properties.
So I would give a try at editing the XYZ.csproj by hand and add or replace what's listed as <TargetFrameworks> with netcoreapp2.0.
If you are adding it as additional target you need to separate them with ';' as in
<TargetFrameworks>net462;netstandard2.0;netcoreapp2.0</TargetFrameworks>
More details about this in this Microsoft doc.
Please keep in mind that this will trigger multiple compilations and will slow your build consequently...
It should be. Microsoft announced a ".NET Framework Compatibility Mode" with the release of .NET Standard 2.0. However, they didn't go into great detail about how it works exactly, or what to troubleshoot if it doesn't. Additionally, they only specific talk about it in relationship to Nuget packages, so it's possible there's some role Nuget is playing in the process, as well. Unfortunately, I've been unable to find any additional information about this feature outside of the announcement post.
That said, Microsoft's explicit recommendation is to not rely on the fact that your .NET Framework library may just happen to work in .NET Core; instead, you should be actively porting .NET Framework libraries you control to .NET Standard. I'd say you're likely going to spend more time trying to figure out why it doesn't "just work" than you would porting your code, so that it will definitely work, and be future-proof to boot.
The following solution worked for me.
Deleted bin and obj folders from all the projects in the solution, rebuild and if it still doesn't work try changing browser from debug options. for eg. If you already have chrome as default browser in Visual studio, switch to Edge or Firefox.
I created an empty ASP.NET 5 to work with .NET Core. I am trying to add MVC package to the application but I am receiving an Error that the Versions are not compatible, although I tried lots of MVC versions.
Anyone has an idea about the problem? thank you!
You need Nuget packages in the Microsoft.AspNetCore.Mvc namespace. You're currently trying to install Microsoft.AspNet.Mvc 5.2.3, which is the traditional MVC package and only works with full .NET.
If you're working with .NET Core you should be using Microsoft.AspNetCore.* packages. (Microsoft.AspNet.* packages target the full .NET framework.)
Your screenshot shows a dependency on DNX. You do realize that's a pre-release technology? I don't mean to be rude but I'm curious as to why you would be targeting the pre-release framework rather than RTM (which has been available for several months).
If you do want to work with the prerelease bits, you may need to tweak your NuGet feeds to be able to see the appropriate .NET Core packages (I definitely had to do this when working with .NET Core betas).