I have a project that targets both .Net 2.0 and .Net 4.5. I built+published it successfully in Visual Studio 2013. The .Net configuration in the .csproj file still says
<TargetFrameworkVersion>v2.0</TargetFrameworkVersion>
Yet, when I open the project in VS 2015, it targets .Net 4.5.
I have 2.0 available in the Target Framework dropdown:
when I click ".Net Framework 2.0" it gives me a popup saying
Changing the target framework requires that the current project be closed and then reopened.
Any unsaved changes within the project will be automatically saved.
Changing Target Framework my require manual modification of project files in order to build.
Are you sure you want to change the Target Framework for this project?
When I click yes, the target framework goes back to 4.5 and nothing else happens.
I've tried reopening the project and VS, with no luck.
I've tried running the .Net 3.5 installer (which apparently includes 2.0), but it says I need to use "Turn Windows Features on/off"
I've ensured the .Net 3.5 Windows Feature is enabled.
And now I'm out of ideas. Has anyone else encountered this?
Running Windows 7.
In case, the .NET Framework 2.0 is corrupted, use the .NET Framework setup verification tool: https://blogs.msdn.microsoft.com/astebner/2013/11/06/net-framework-setup-verification-tool-and-cleanup-tool-now-support-net-framework-4-5-1/ to verify and once it found any corrupted, you can use the .NET Framework Repair Tool: https://www.microsoft.com/en-us/download/details.aspx?id=30135 to repair it.
Or under ‘Turn Windows Features on or off’, uncheck .NET Framework 3.5 (includes .NET 2.0 and 3.0), then check it.
As Hans Passant mentions in the comments, I apparently(?) edited the .csproj to use different frameworks for different configurations. I swear this didn't cause any issues in VS 2013.
But in any case, I verified using ILSpy that the .dll being generated is .Net 2.0, even though the dropdown says 4.5. So I guess all's well that ends well?
Related
I have a problem of debugging. I have the window created with the buttons, labels and everything, but when i try to debug it, the UI/GUI doesn't show up.
I am on windows 10 Visual studio 2019, with Developers mode on (since Visual Studio is asking for it when creating WFA or Windows Forms App). I have .Net Framework 3.5 Installed and i dont see the reason why it shouldn't work. I see it every time i create a project.
The Application i am trying to create is a .Net Framework WPF
The Reason why the Debugging doesn't show the UI is because of the .Net Framework you are using is not compatible with the .Net Framework version your project is set to work on
you can set the normal .Net Framework version you want your Project to work on in the Section when the Visual Studio is asking for the Name of the Project, the Solution Name and the path. At the very bottom, you will see something along the lines of ".Net Framework". Click on that and choose any Version you want your project to work on. (Warning Note: .Net framework 4.5 and .Net Framework 4.8 may have compatibility issues. This info is in th link below)
You would need .Net Framework 4.5 or above
I highly recommend getting .Net Framework 4.8 since it is a .Net Framework version that supports .Net Framework 4.7.2
I had this issue and when i installed .Net 4.8, the Debugging instantly started working.
For More Information, Check out this Link:
https://learn.microsoft.com/en-us/dotnet/framework/migration-guide/runtime/4.5-4.8
[18th April 2022] - Edit: .Net 6 is a thing. You can use that instead of .Net Framework 4.8
I tried to open a script in VS2015 from Unity 5.6.
For some reasons, this popup shows up and I click the first option and change the target to .Net Framework 4.5.2 and everything builds and works as expected.
However, every time I made changes in the Unity editor and switched back to Visual Studio, this dialog pops up again.
When I looked into the csproj files, I can see that, after I made changes in the Unity editor, I see this:
<TargetFrameworkIdentifier>.NETFramework</TargetFrameworkIdentifier>
<TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
<TargetFrameworkProfile>Unity Full v3.5</TargetFrameworkProfile>
Then after I selected "Change the target to .NET Framework 4.5.2"
I see this:
<TargetFrameworkIdentifier>.NETFramework</TargetFrameworkIdentifier>
<TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
It seems that the Unity editor is configured to change the .Net Framework to 4.5.
I tried to install .Net Framework 4.5 but it is already installed.
Is there any way I can either use .Net 4.5 in Visual Studio or change the target framework in Unity such that this dialog won't pop up again?
Before you do anything complicated, try this:
Open Edit>Project Setting>Player
Click Other Setting, go to Configuration, if the scripting runtime version is .NET 3.5, change it to .NET 4.x.
This not only fixed the warning, it also got back VS intellisense and the MathNet.Numerics can now be installed properly.
If this does not work, then try this link project-target-framework-not-installed.
In the Unity roadmap is stated that support for .net 4.6 will be added arround july 2017. The beta is out allready.
Scripting Runtime Upgrade (Preview)
Upgrade Mono and IL2CPP .NET runtimes to support the latest .NET functionality and APIs. This includes access to C# 6 and the .NET 4.6.x class library profile.
Currently Unity is only compatible with .net 3.5 but here is an workaround which may help.
If you have any of the .NET Framework v4.6 series allready installed you only need to install the Visual Studio 2015 Tools for Unity to be able to use the project without conversions.
So I am trying to open one of my team's project and I think it is in .NET 4.6.2. and it gave me usual error of you do not have this framework version, do you want to install it?
So I went ahead and installed that version and also restarted my computer. After that even if I see in my Control panel that I have already installed .NET Framework 4.6.2 Visual studio continues to complain about not having that particular version of .NET
Any idea on how to address this issue?
You need the .NET 4.6.2 targeting pack, not just the runtime.
Download can download it here https://www.microsoft.com/en-us/download/details.aspx?id=53321
The issue comes up when you install Visual studio 2012 on a machine without Visual studio 2010 installed previously (I think). I want to target .net 4.0, while building on Visual Studio 2012. I already have set up the machine without VisualStudo 2010. I end up with messages like:
*Warning 2 The primary reference "blablaLibraryproject" could not be resolved because it was built against the ".NETFramework,Version=v4.5" framework. This is a higher version than the currently targeted framework ".NETFramework,Version=v4.0". blablaExecutableproject*
The answering post here(Can a build server with .NET 4.5 installed successfully deploy a project targeting 4.0 to a server with only .NET 4.0 installed?) says:
You can correct this, but you need to add the 4.0 reference assemblies to your build server (so the compiler finds them), and not
just rely on the .NET 4.5 versions.
So how does one "add the 4.0 reference assemblies to your build server (so the compiler finds them)"?
They are already present on the machine. Just change the Target Framework setting of the project from 4.5 to 4.0
The problem discussed in that linked question is a pretty common one for programmers that try to setup a build server without paying for the VS license. Which goes pretty far, but is missing an otherwise freely available component, the multi-targeting packs for the .NET Framework versions.
Which is penny-wise but pound-foolish. They then make a fatal mistake, they add reference assemblies from c:\windows\microsoft.net instead. Like it was done in framework versions prior to .NET 4.0. This causes horrible to diagnose runtime exceptions when the built product is ran on a machine that only has 4.0 installed. The asker of the question was pretty lucky, he got a relatively easy to diagnose one. That however can be a lot worse, getting pretty bizarre TypeLoadExceptions for common framework types.
You don't have this problem, you installed VS so you already got the multi-targeting packs. The 4.0 version is available in C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0. Both MSBuild and VS know how to find it there without your help. Just change the project setting to tell them that you want to target 4.0
In addition to Hans' answer, here is another possible reason for this:
My build server had Visual Studio installed, however, my project targeted .NET 4.0.3 and that specific target framework was missing on my build server. Therefore it silently defaulted to .NET 4.5.
I fixed this by changing the target framework of my project to .NET 4.
I have a C# project that I previously had targeting .NET 4.0, and now I want to target .NET 3.5, but I am getting this warning:
The version of the .NET Framework launch condition '.NET Framework 3.5' does not match the selected .NET Framework bootstrapper package. Update the .NET Framework launch condition to match the version of the .NET Framework selected in the Prerequisites Dialog Box.
But when I look under Publish->Prerequisites, .NET framework 3.5 SP1 is checked.
What do I need to do to get rid of this warning? There is no checkbox for .NET framework 3.5 without SP1, can I just not check any box?
I checked the launch condition, and the .NET framework launch condition version is already 3.5.
I found that I needed to right click on my Setup and Deployment project, hit properties, go to prerequisites, and uncheck .NET framework 4 and check .NET framework 3.5.
I had done that for all of the projects but for the setup and deployment project. I didn't realize it had its own prerequisites section.
It's likely coming from the installer project that you have within the solution. I'm guessing you do have one, as it's the only place I've seen Visual Studio talk about launch conditions.
Select it in Solution Explorer, and then at the top click the little icon with binoculars (Launch Condition Editor).
Under Launch Conditions, right click on the .NET Framework and open the properties, and then change the Version to .NET Framework 3.5.
I just got that error and i fixed it easily by double clicking the error message.
A window shows up. Then you can modify the properties of the different elements on the page by right clicking them -->> properties.
Just make sure all the items on this page have the desired framework version.
PS: on VS2010