project-system VS IsExternalInit

The .NET Core one was necessary once. Today msbuild (and I believe VS too) uses heuristics instead, so it does not matter which GUID you use.

The Visual Studio project system is extensible, allowing you to integrate your custom project and SDK right into VS.

From the https://github.com/dotnet/project-system/blob/main/docs/build-acceleration.md

https://github.com/dotnet/project-system/pull/8438 (note: will be available in 17.4)

You can do this via csproj or launch settings by hands, but it won't work, see https://github.com/dotnet/project-system/issues/3690

Did you change the startup form for your project? If so, this is a bug that should be addressed soon. The easiest way out is to undo the change you made to the startup object setting it back to form1.

Sdk at least works with .net standard so shared projects can be converted to that, we also had some success using the MSBuild.SDK.SystemWeb sdk nuget package for our MVC5 projects which I found from the github issue discussions on adding official support for it on older projects.

For sure. If you still have access to the project, file a bug on https://github.com/dotnet/project-system so that someone can fix it for others too.

So this would be related to the project system module in Visual Studio but I am not sure how C++ specifically is handled. Might be worth bringing up here to find out where to report things like this or at least find out why they work the way they do.

You can also just reference the https://github.com/manuelroemer/IsExternalInit NuGet package.

init only properties (likely to come up if you use records) - you can either use the IsExternalInit nuget package or manually define the attributes - either way, the feature works perfectly fine

…and a NuGet reference to https://www.nuget.org/packages/IsExternalInit, I can then do public record Foo(string s); and have it build.

You only need https://github.com/manuelroemer/IsExternalInit for that (and to set LangVersion).

Even for .NET Framework code, I tend to use recent C# versions. I reference https://github.com/jnm2/ReferenceAssemblyAnnotator to get nullable support and https://github.com/manuelroemer/IsExternalInit for records, and that takes care of most of the features I care about.

features that require BCL additions. Since you're on the older BCL, those will need to be backported. For example, to use init; and record, you can use https://github.com/manuelroemer/IsExternalInit.