I tried upgrading a .NET standard project to a .NET 6 project using this upgrade assistant tool:
https://dotnet.microsoft.com/en-us/platform/upgrade-assistant/tutorial/install-upgrade-assistant
I ran the tool as the steps describe (installing it, using upgrade-assistant analyze with the project csproj path and then upgrade-assistant upgrade with the path), but after it was done, the project still remains with a target framework of .net standard 2.0.
Is there something else needs to be done in order to upgrade the framework?
I eventually simply edited the project file directly. To convert it to .net 6 all you need to do is change the <TargetFramework> to be like this:
<TargetFramework>net6.0</TargetFramework>
It's a 3 seconds work so no need for any tools
.NET standard works parallelly. That means you would have to update to .NET standard 2.1 if you need it for other old framework projects. Otherwise create new libraries in .NET 6 and migrate your code.
According to microsoft:
https://dotnet.microsoft.com/en-us/platform/dotnet-standard,
.NET 6 supports .NET Standard 2.1.
Future versions of .NET will also support .NET Standard 2.1 and earlier versions.
The interface Project > Property tools isn't the way to update version from .Net standard to other versions other than standard versions. The right/easiest way is updating the TargetFramework in .csproj file of the project directly.
Related
I'm currently writing a project in C# 7.3 but I need to change it to C# 10.0
When I go to my project's properties' advanced build settings, the option to change the language version is disabled. I'm not sure why it's grayed out, but I don't know how to manually change the C# version. If someone could help, that would be great, thanks!
Screenshot of the advanced build settings
Taken directly from the documentation
The compiler determines a default based on these rules:
Target framework
version
C# language version default
.NET
7.x
C# 11
.NET
6.x
C# 10
.NET
5.x
C# 9.0
.NET Core
3.x
C# 8.0
.NET Core
2.x
C# 7.3
.NET Standard
2.1
C# 8.0
.NET Standard
2.0
C# 7.3
.NET Standard
1.x
C# 7.3
.NET Framework
all
C# 7.3
C# 10 is supported only on .NET 6 and newer
You haven't provided the target framework for your project. But you likely need to retarget your project to a framework that supports C#10
You can try to edit the .csproj file by adding something like this:
<PropertyGroup>
<LangVersion>10.0</LangVersion>
</PropertyGroup>
C#10 is already the default language version if your target framework is .NET 6, provided you're not overriding it with the LangVersion entry as mentioned in other answers. If you're not targeting .NET 6 or compiling with VS/Build Tools 2022, you'll need to upgrade those first in order to have proper C#10 support.
If you are attempting to set the C# language version manually, keep in mind the default can be overridden in two locations (or programmatically): the project file (aka ProjectName.csproj), or a Directory.Build.props file (for explicitly overriding multiple projects at once). If the aforementioned props file exists, check it as well as your project file to ensure you don't have conflicting entries.
In your case, there's really no reason to manually specify the language version; just upgrade your compiler and use the default. If at that point you still find the project targeting anything < C#10, be aware that the culprit isn't necessarily confined to being the project file.
I'm just getting started in NuGet packages creation thing and I know how to create a NuGet package for .NET Framework and .NET Core applications but I'm not sure if there any way of creating the NuGet package where it will support both .NET Core as well as .NET Framework. But I've seen the NuGet packages that works with both .NET Core and Framework.
For example, if I open .nupkg file of NewtonSoft.JSON I see the something like this.
Newtonsoft.JSON hierarchy
And yes, currently I'm developing my packages using .NET Framework 4.5, so it supports both. But I want a native support for that package not with the backwards compatibility in my .NET Core applications. Also, I don't want to develop using .NET Standard, because in Newtonsoft.JSON package it looks like they are using the .NET Standard.
.NET Standard is a specification that has multiple implementations including .NET Framework and Core/5/6.
If you want to support Framework 4.5 in addition to core the most up-to-date version you can target is Standard version 1.1.
ref: https://learn.microsoft.com/en-us/dotnet/standard/net-standard?tabs=net-standard-1-1
In one of my .NET Framework projects, I introduced a new .NET Standard 2.0 project. This project has dependencies on some existing .NET Framework projects. I was wondering if this is right to do.?
The reason I added a .NETStandard project is that we have plans to move the whole repository to .NET Core / Standard. Hence I thought, the new project we add can target .NET Standard. With .NET Standard project I get the new SDK style project file, package references, etc by default.
The consuming application is still .NET Framework.
Do I have to retarget the new project to .NET Framework 4.7.2 so that the project will have the above SDK style project file and package references but targets .NET Framework 4.7.2 now. It will then be as easy as changing the target framework when we move to .NET Core?
Depends on your purpose of introducing the Standard 2.0 project. Normally, you make a Standard when you need it to be accessible both from .NET Framework and Core. In your case, your Standard project won't be operable from Core under macOS or Linux.
Yes, this can be done.
https://learn.microsoft.com/en-us/dotnet/standard/net-standard?tabs=net-standard-2-0
.NET Framework compatibility mode
Starting with .NET Standard 2.0, the .NET Framework compatibility mode was introduced. This compatibility mode allows .NET Standard projects to reference .NET Framework libraries as if they were compiled for .NET Standard. Referencing .NET Framework libraries doesn't work for all projects, such as libraries that use Windows Presentation Foundation (WPF) APIs.
This is necessary as an intermediate step for some projects, but in order to get to your final goal you will of course have to go all in on .net core which will require updating those projects not to use framework or they will crash at runtime.
I am pretty new in C# and .NET and I have the following problem.
I created a NUnit (version 3.10.1) project in my solution. The thing that I can't understand is: why the framework version is the 2.1? Is not a very old version? If I try to change it I obtain older version, I am attaching a screenshot:
The strange thing is that the other project into my solution uses the .NET 4.5.2 framnework version.
Why this NUnit project is using an old framework version? there is a way to update it?
What is wrong or what am I missing?
You are targetting .NET Core, which is a completely different framework than the Full .NET Framework.
When you create a new project, you specify the framework to target. You created this one to target .NET Core.
To change your project to target Full framework 4.5.2:
Right click the csproj and select edit <yourprojectname>.csproj
Locate the <TargetFramework> element
Change it from netcoreapp2.1 to net452
Close the csproj file
For more info on .NET Core, you should have a look at the About .NET Core documentation.
.NET Core is an open-source, general-purpose development platform maintained by Microsoft and the .NET community on GitHub. It's cross-platform (supporting Windows, macOS, and Linux) and can be used to build device, cloud, and IoT applications.
And taken from the .NET Core on Wikipedia
I really wanted to be a good citizen... copied all my classes to .net standard 1.6 libraries. Just to find out that my test DLL can't use it. I get the following error
Project X targets '.NETStandard,Version=v1.6'. It cannot be referenced by a project that targets '.NETFramework,Version=v4.6.1'.
Of course, when I check .Net Standard (https://learn.microsoft.com/en-us/dotnet/articles/standard/library) it says that with 1.6 it can target 4.6.1.
I tried 4.6.2 without better luck. I installed the .net standard 1.6.1 NuGet package. Anyway, you guys are awesome, I'm sure you'll tell me which stupid mistake I'm making that is preventing me from doing something as basic as running unit tests with a .net standard library.
Thanks
P.S. I did find a work around (kind of) by using a .net core unit test project instead of a .net framework one. It doesn't solve my problem, so I can't mark that as an answer, but at least I can go back to coding...
You need to upgrade to .Net Core SDK 2.x+
Once that is installed restart your machine and you should be able to reference NetStandard 1.6 in .Net Framework 4.6.1+
With .Net Core SDK 1.x you can only reference Net Standard 1.5 in .Net Framework 4.6.2
Best would be to upgrade your Net Standard project to version 2.0 if you can.
In case of errors with similar titles that are targeting different versions of .net framework, this usually means that you need to (install if already not and) change the target of your project to newer/newest version of .net framework to comply with the project that targets newer .net standard.