Best way to detect target framework(s) in a CPS project

[ErikEJ]

I tried:

await project.GetAttributeAsync("TargetFrameworkMoniker");

But it breaks with:

<TargetFrameworks>netstandard2.1;net6.0</TargetFrameworks>

(Only the first one is returned)

"TargetFrameworkMonikers" retrurns an empty string

[MagicAndre1981]

GetProjectFrameworksAsync from public interface IActiveDebugFrameworkServices, but getting the nugets is difficult you need to use a custom nuget.config with sources for vs-impl source because the interface is not included in the latest version on nuget.org.

But for what ever reasons, getting the nugets doesn't work for all users all time.

[ErikEJ]

But for what ever reasons, getting the nugets doesn't work for all users all time.

They look too internal/wip to me. Hoping a more general solution from @reduckted perhaps? 😄

[MagicAndre1981]

Microsoft has some plans to maybe publish them on nuget when a new VS 2022 update is released. As you can see this is a long open issue and it can still take some time to get it solved

[ErikEJ]

I ended up doing this:

        private static async Task<string> GetTargetFrameworkMonikersAsync(Project project)
        {
            string result = null;

            project.GetItemInfo(out IVsHierarchy hierarchy, out uint itemId, out _);

            await ThreadHelper.JoinableTaskFactory.SwitchToMainThreadAsync();

            try
            {
                var vsProject = (IVsProject)hierarchy;

                if (vsProject != null)
                {
                    var props = vsProject.ToProject().Properties;
                    result = props.Item("TargetFrameworkMonikers")?.Value?.ToString();
                }
            }
            catch
            {
                // Ignore
            }

            if (string.IsNullOrEmpty(result))
            {
                result = await project.GetAttributeAsync("TargetFrameworkMoniker");
            }

            return result;
        }

        private static EnvDTE.Project ToProject(this IVsProject vsProject)
        {
            ThreadHelper.ThrowIfNotOnUIThread();

            var vsHierarchy = (IVsHierarchy)vsProject;
            var hr = vsHierarchy.GetProperty(
                (uint)VSConstants.VSITEMID.Root,
                (int)__VSHPROPID.VSHPROPID_ExtObject,
                out var project);
            Marshal.ThrowExceptionForHR(hr);

            return (EnvDTE.Project)project;
        }