The difference between my question and previously asked questions is that I don't mind having .NET 4.5 installed on the server or the development environment. However, I don't currently intend to change the target framework of my original 4.0 projects in the solution. I wish to have only one new project that targets .NET 4.5 and have one of the other 4.0 projects call it.
I tried to add existing item and 'Add as Link' as described here but that didn't help.
Can my purpose be implemented anyhow? I don't mind adding a web service to one of my projects if that would be a resolution.
An assembly/application that is targeted to 4.0 will not be able to make calls to classes/methods in 4.5. If you cannot update the targeting to 4.5, then splitting your app into two separate apps and using webservices would work, as long as your client application doesn't need the 4.5 framework to consume those services (e.g. a data type only in the 4.5 framework.)
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I'm porting my WPF application from .NET Framework to .NET Core 3. I got this generic UI library that is published on NuGet, that is currently targeting .NET Framework v4.6.1. Now, if I just change the target to .NET Core 3, then it won't work anymore in .NET Framework projects. .NET Standard is designed to solve this kind of problem but I don't think it will help in the case of WPF projects.
What's the right thing to do here? Publish and manage 2 separate packages?
Then this library has 2 other derived libraries. If I create 2 separate packages for the base library, that means I'd have to publish and manage 2 of each derived libraries as well. This solution stinks. Got anything better?
A WPF application that targets .NET Core 3 may actually reference and consume a control library or NuGet package that targets .NET Framework 4.6.1.
You shouldn't have to do anything with the control library itself for this to work, assuming you don't use any APIs that is not present in .NET Core because then you will eventually get runtime errors.
Try to add a reference to the DLL or install the NuGet package as usual. It should work even if the NuGet package only contains a single assembly in lib\net461.
I'd really like to start using .NET Core and slowly migrate applications and libraries to it. However, I can't realistically upgrade my entire code base to use .NET Core and then go through the process of testing and deploying a plethora of applications in production.
As an example, if I create a new .NET Core application and try to reference one of my .NET Framework projects I get the following:
The following projects are not supported as references: -
Foobar.NetFramework has target frameworks that are incompatible with
targets in current project Foobar.NetCore.
Foobar.NetCore: .NETCoreApp,Version=v1.0
Foobar.NetFramework: .NETFramework,Version=v4.5
Is it possible to create a new .NET Core application and reference my existing .NET Framework libraries? If so, what's the process for doing that? I've spent hours going through Microsoft's documentation and searching their issues on GitHub, but I can't find anything official on how to achieve this or what their long-term vision is for this process.
Old question, but with the release of .NetStandard 2.0 and .netcore 2.0 and vs2017.3, the game has changed.
You can use the Full .NET Framework (TFM) with .NetCore 2.0, but how?
In Visual Studio 2017.3, you can reference the Full .NET Framework (any version) directly from within a .NetCore2 project.
You can build the .NetStandard2 class library and reference your TFM. Then reference your .NetStandard2 library from your .NetCore2 project.
For example, referencing json.net net45 from .NetStandard2.
Browse to the folder and select version net45 (not netstandard1.3)
See the dependency in the image below, no yellow warning as you see.
Even if a Nuget library is not ready to be ported to .Netstandard 2, you can use any API in the library that is compliant to net461.
Quoting for the .NET Core 2/Standard 2.0 announcement with links:
.NET Core 2.0 is able to freely reference libraries that have been built for .NET Framework up to version 4.6.1
However, some libraries may fail at run time if they try to use API methods that aren't available on .NET Core
Reference: .NET Core App target .NET framework 4.5.2 on Linux
A need to use third-party .NET libraries or NuGet packages not available for .NET Core
So only in cases where the libraries or NuGet packages use technologies that aren't available in .NET Standard/.NET Core, you need to use the .NET Framework.
Reference: Choosing between .NET Core and .NET Framework for server apps
You can now reference .NET Framework libraries from .NET Standard libraries using Visual Studio 2017 15.3. This feature helps you migrate .NET Framework code to .NET Standard or .NET Core over time (start with binaries and then move to source). It is also useful in the case that the source code is no longer accessible or is lost for a .NET Framework library, enabling it to be still be used in new scenarios.
Reference: Announcing .NET Core 2.0
Yes, we are currently attempting the same thing. The trick is to make sure that you are supporting the same .NET frameworks. Inside your project.json file, make sure the framework matches the framework of the project you wish to include. For example:
"frameworks": {
"net46": { --This line here <<<<
"dependencies": {
"DomainModel": {
"target": "project"
},
"Models": {
"target": "project"
}
}
}
},
FYI: You might need to change the framework of your .NET Core or your older projects to achieve this. .NET Core can be changed just by editing the project.json file as seen above. You can so the same in .NET projects by right clicking the project and opening properties. Change the framework level there.
Once you have matched the two project frameworks then you should be able to include them. Good Luck!
We delayed migrations as long as could as it seemed daunting as first. But we got an insistent client who wanted to migrate ASAP.
So we migrated their Fintech Web App developed on .NET Framework 4.8 Web Forms to .NET 6 Razor Page. Our team scoured though hundreds of online resources & spoke to Microsoft Tech Support before we started the project. Hope the high-level walkthrough of our journey help you plan your migrations.
Our .NET Framework Website consisted of 1 .NET Web Forms project and 12 Class Libraries.
Here is how we did it.
Refactored the .NET Framework 4.8 Web Forms code
We ensured that the Web Forms code behind did not have a single line of service or business logic code. When we did find some business logic code in the web forms code behind, we refactored it, by moving it to the class libraries.
Created new .NET Standard projects
We created a new .Standard 2.0 Class library project for every .NET Framework 4.8 Class Library. If the original project was called "FintechProjectName.StockMarketClient", we named the .NET standard project "FintechProjectName.StockMarketClient.Standard".
Copied all files from .NET framework to .NET standard
We copied all the class files from .NET framework to .NET standard projects. We then removed all the .NET framework class libraries from the solution and added references to the new class libraries. All projects compiled on the 1st try itself and all our test cases too passed with minor changes.
Create new .NET 6 Web App Project
We created a new .NET 6 Web App Project. We had to entirely redo the front-end as there is no direct path for migrating Web Forms to Razor Pages. This was the only project which took us about 1 month to migrate.
Reference .NET standard class libraries in the new .NET 6 website
We copied all the .NET Standard libraries to this new solution containing the Razor Pages web site. Added the references and got it to work.
Move from .NET Standard to .NET 6 class libraries
Once the new website was up and running, with all test cases passed, we did the last step in the process which was the simplest. Created .NET 6 class library projects for each of the .NET standard libraries and named the projects appropriately. Copied all class files from .NET standard projects to their corresponding .NET 6 projects. Then we removed the .NET Standard libraries and added references to the new class libraries.
Overall project timelines were about a month and a half, most of it spend on Razor Pages implementation using the same html design.
Note:
If you are using any 3rd party library which does not have a .NET standard or .NET 5 version, then you are out of luck. You will need to find a replacement nuget package and recode your application to use this new library.
In my case with .net6 referencing framework 4.8 library ( both winforms), the trick seems to be to add the reference to the framework dll as a shared reference.
I have an application called NinjaTrader that uses .Net 3.5. I have a Strategy that will send order information to a .dll written in .Net 3.5. I need to send this order information to a platform called T4 that currently uses .Net 4.0. I thought about using C++ as my .dll however everything still seems to target "some" .Net assembly. I am currently using a asynchronous client server connection that does a decent job. I just think it would be better to just run it through a .dll or something. Does anybody have any ideas of the most stable solution?
If you're planning on using .NET from C++ you would need to use C++/CLI.
Also, in order to use CLR v4 you would need your project to run in .NET 4.
See this question.
The best solution IMO would be to just recompile your project to target .NET 4. There shouldn't be many changes to make in your project assuming it's not a huge project. Have you tried recompiling for .NET 4?
Stuck with a legacy web app that has its entire Biz & Data logic inside a .NET Remoting project.
Web project runs in 4.0, however Remoting layer is under 2.0.
Trying to see if its possible to migrate those DLL's to .NET 4.0 to simplify deployment process and remove the need to have 2 separate application pools.
Is this possible ?
According MSDN "legacy technology that is retained for backward compatibility with existing applications and is not recommended for new development." - so I'm assuming the namespaces should still be present in 4.0.
Yes, this is possible. The remoting stuff still works fine in .NET 4.0.
I am new to .NET and c#.
There are so many good examples out there made for .NET 4.0, but when I do NUGET it complains that the target .net version mismatches.
I am developing for Windows 8 and Windows Phone 8, so they use .NET 4.5.
Is there any way to just convert the old projects and force them to use .NET 4.5?
Or do I need to wait for the author to update his project?
You can develop for Windows 8 with .NET 4.0, that's not a problem. Also you can load .NET 4.0 projects into Visual Studio 2012 and then change the properties of the project to .NET 4.5 if you want to. Also all APIs should be usable by themselves without modification.
So do you have a project that is for .NET 4.5 and you're trying to add .NET 4.0 stuff from NUGET or what?
Naturally WinRT projects are totally different from "normal" .NET projects, so they will need converting.
If you're developing Windows Store or phone applications, you'll need updated projects, as it's a separate runtime. It's "4.5", but it's not the standard 4.5 runtime. If you're developing desktop applications using .NET 4.5, you should be able to use .NET 4 (and earlier) assemblies without issue.
The best option here, when possible, is to have the dependencies by a Portable Class Library usable by all target platforms, but this would require the other projects to be designed this way.
Depends on what references you use in your code, if they are untouched by 4.0 to 4.5 conversation then you are in luck, however if that is not case you will need author to update code of project to match 4.5.