I have been trying to add the Square.Connect nuget package so that I can integrate with the square up payment system.
When I am trying to add the package I am getting an error:
"Could not install package 'Square.Connect 2.14.0'. You are trying to install this package into a project that targets '.NETFramework,Version=v4.5', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author."
I have tried on a new application using .net 3.5 and .net 2.0 but I get the same error but with the changed target version.
Has anyone been able to get around this or can you advise me what I maybe doing wrong?
According to nuget.org https://www.nuget.org/packages/Square.Connect/ the Square.Connect package is for .NETStandard 2.0. So you should target that. Hint: Expand dependencies on the nuget page, to see what it requires.
This package is incompatible with your project.
You should target .NET Standard 2.0 or .NET Full Framework 4.6.1 or higher.
Both can work with .NET Standard 2.0 assemblies.
.NET Core 2.0 too, but that's not usefull for you, I guess!
As Palle Due's answer says, the package information page for the most recent version of the package lists .NET Standard 2.0 as a dependency. Therefore, your project must target something compatible with .NET Standard 2.0. This table lists several compatible runtimes, such as .NET Framework 2.6.1 or higher, .NET Core 2.0 or higher, as Schwarzie2478's answer listed (but he didn't give source information, which I think is useful). The table also lists minimum versions for some other runtimes like Xamarin's Android/iOS, or Unity game engine.
However, if you look at some older versions of the package, 2.10.1.297 and earlier depend on .NET Framework 4.5. Therefore, if for some reason you can't target a newer version of the .NET Framework, you could use these older versions of the package. Although I don't know any reason why anyone would be stuck on such an old version of the Framework. .NET Framework lifecycle is complex and very difficult to find a table with actual dates, but my guess is that no supported server operating system is limited to .NET Framework 4.5, so any server installing security updates will probably be on .NET Framework 4.6.x or more likely 4.7.x, so I really don't see any good reason to stay on net45.
Related
My first steps in C# are horrible.
Now I'm trying to install Entity Framework. For doing that, I just go to the NuGet package manager, I type "Entity" and try to install the first entry, the "Microsoft.EntityFrameworkCore", version v5.0.10.
That fails with following error message:
Could not install package 'Microsoft.EntityFrameworkCore 5.0.10'. You are trying to install this package into a project that targets '.NETFramework,Version=v4.6.1', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author.
How is this possible? .NetFramework, version v4.6.1 is the default in my company, I just clicked on the first NuGet package in my search result and Visual Studio 2017 is, as far as I know, a basic IDE.
In top of that, there is no direction where to go: the error message just says "not compatible" but no mentioning of .NetFramework version being too old or too recent, the .Net Framework being too old or too recent, ...
The error message mentions "to contact the package author", but when I visit the "Project URL" of the Entity Framework (https://learn.microsoft.com/en-us/ef/core/), that website does not even mention .NetFramework.
Does anybody know the simplest way to solve this issue? (I believe installing another version of Entity framework would be advised)
Thanks in advance
Despite #MarcGravell's comment EF Core works fine in a .NET Framework project. But unfortunately, v5 only works in frameworks which support .NET Standard 2.1, which excludes any version of .NET Framework.
.NET Standard | Microsoft Docs
For a .NET Framework project, the latest version of EF Core you can use is v3.1.19. This supports .NET Standard 2.0, which technically includes .NET Framework 4.6.1 and later.
Install-Package Microsoft.EntityFrameworkCore -Version 3.1.19
NB: As mentioned in the MS docs, there are some issues consuming .NET Standard 2.0 libraries from .NET Framework 4.6.1 applications. In particular, you will probably end up pulling in a large number of support packages. It would be better if you could upgrade your application to at least .NET Framework 4.7.2, which doesn't have these issues.
I've confirmed that in VS2017 Nuget Package Manager the first entry is "Microsoft.EntityFrameworkCore" and it is wrongly indicating "Latest Stable 5.0.10" as the applicable version when searching for "Entity" while using references for a .Net 4.6 project. (NuGet should be suggesting based on suitable target dependencies)
As Richard pointed out You can use EF Core within a .Net Framework project, but the limit is EF Core 3.1 as .Net Framework is only supported up to .Net Standard 2.0. If you're using the package manager UI in VS You will want to use the drop-down for "Version:" to select "3.1.19" as this is the last version that will work with .Net Framework 4.x.
I would recommend using EF6 for .Net Framework projects rather than EF Core 3.1 as 3.1 is still missing features found in EF6. Searching for "EntityFramework" will locate "EntityFramework" which is EF6. (Odd that it doesn't seem to come up readily under the search term "Entity")
Note that if you are targeting .Net Framework 4.6.1 the end of support for this version is April 2022. You should strongly consider updating the target to 4.8, or at a minimum 4.6.2.
I currently have a ASP.NET Core Application running on ASP.NET Core 3.1.2.
While looking for package updates, i realized, that a lot of Microsoft packages (e.g. Microsoft.Extensions.Caching.Memory, Microsoft.Extensions.Configuration.Abstractions, ...) have been updated from 3.1.2 (the latest version available when i built the application) to 3.1.5. Also the latest .NET Core SDK and Runtime has been updated to 3.1.5.
Is this a coincidence or is there any connection between .NET Core SDK / Runtime and NuGet package versions?
Also can i update my NuGet packages to 3.1.5 without updating the .NET Core Runtime on my server?
Thanks,
Jens
Generally they don't have to match, unless some reflection that requires some exact version of some assembly (which happens to ASP.NET Core very often).
Due to the semantic versioning of .NET Core platform and packages, updates in the third version must bring no API changes, so they will always build without failure and regular calls to these packages would work properly.
I want to create a Nuget Package for a C# library that targets .NET Framework 4.0 and higher.
If I put my library in a directory named Net40, will this cause issues for projects that target say 4.1 and higher?
Should i just publish my library in a lib folder without specifying the supported .NET Framework version?
My library supports .NET Framework 4.0 and higher.
The reason why I am asking is that sometimes projects get messed up quickly when they target a different platform whilst the installed libraries via NuGet target another platform version. At least I want to avoid issues when developers target 4.0 and higher.
I hope your advice will be very helpful.
I'm having a .Net 4.7.2 application, in which I want to reference the package OpcFoundation.NetStandard.Opc.Ua. This project as a list of dependencies for .Net 4.6 that is quite small.
But when I install it, I get like 50+ additional packages to install. Is there a way to reduce this? I feel that a lot of thoses classes are already existing in the full .Net project(System.Threading.Tasks/Timer/...).
Thank you
If you look at many of these types (which are supplied by .NET Standard packages, not .NET Core), you'll find that the specific version that's used against .NET 4.7.2 will be an empty assembly just containing lots of TypeForwardedTo attributes pointing right back at the full-flavour .NET Framework.
So you still end up using the exact types you always would have done. There's just extra indirections which allows .NET Standard to work with both .NET Framework, .NET Core and other .NET Standard implementations.
I have a Xamarin Forms project and the majority of times that I want to install a nuget package I have an error saying that:
Install-Package : Could not install package 'Microcharts 0.7.1-pre'. You are trying to install this package into a project that targets
'.NETPortable,Version=v4.5,Profile=Profile259', but the package does not contain any assembly references or content files that are compatible with that framework.
I Assume I can work this out by changing the project .net framework target. But when I go and change it, I get an error saying that it cannot change the target because that implies upgrading nuget to 3.0 and It can´t do that.
So my question is: Which is the best way(and simplest) to change the target framework so I have less problems like above with nuget packages.
This library was built to target .NETStandard v1.4. You are trying to use it in a PCL project, that is not possible. PCL is on the way out as the previous not-so-good way to build cross-platform libraries, .NETStandard is the new way.
There is no older version available of this library, rebuilding it from source is a possible option. But realistically it is time to move on to avoid hitting this wall over and over again, you need to update your tooling so you can consume these kind of libraries. The VS2017 Community edition is freeware.
It is time to go from your
.NET PCL Library to an appropriate .NET Standard Library.
Here are some links concerning the migration to .NET Standard.
Upgrade PCL to .NET Standard Class Library
.NET Standard 2.0 Support in Xamarin.Forms
Converting PCL (Portable Class Libraries) to .NET Standard Class Libraries
.NET Standard - PCL Compatibility
.NET Standard Implementation Support
My Suggestion concerning the version of the .NET Standard to use.
If you don't care about backwards compatibility (You want to use the latest OS and SDKs) go all the way to .NET Standard 2.
If you want to have a good backward compatibility you should go on .NET Standard 1.1 - 1.5.
On most projects i use 1.4 - 1.5.