Roslyn does not load ASP.NET Core 2 documents

[CamiloTerevinto]

Version Used: Visual Studio 15.3.1

Steps to Reproduce:

1. Create a solution with ASP.NET Core 2 over .NET Framework 4.7
2. Create another solution with a Console Application over .NET Framework 4.7
3. Use the following code to compile the ASP.NET Core project:

var workspace = MSBuildWorkspace.Create();
var solution = await workspace.OpenSolutionAsync(solutionPath);
var compilation = await solution.Projects.Single().GetCompilationAsync();
var result = compilation.Emit(memoryStream);

Expected Behavior:
The memoryStream, when written to a file, contains the correct DLL which, when read, has the types defined in the ASP.NET Core project (like Program, Startup, Controllers, etc).

Actual Behavior:
The project has HasDocuments = false and the generated DLL does not contain any type. See this SO question for further details

[CamiloTerevinto]

Looking at the Worskpace after loading the solution, I have an error message on the Diagnostics property:

Msbuild failed when processing the file 'D:\MyWebProject.csproj' with message: The SDK 'Microsoft.NET.Sdk.Web' specified could not be found.

[DustinCampbell]

Unfortunately, MSBuildWorkspace does not support .NET Core projects very well yet. We're working on it but don't have an estimate of when it will be done.

[CamiloTerevinto]

@DustinCampbell is there any other approach I could be taking? Maybe a nightly build or executing through command line?

[DustinCampbell]

There's nothing available yet (work quite literally began this week 😄). There are some tricks you can try to workaround but I have no idea how well they might work.

For the particular error above you might consider setting the "MSBuildSdksPath" environment variable to the location of the appropriate .NET Core SDK on your machine before creating the MSBuildWorkspace. For example, on my machine, I might have the following:

Environment.SetEnvironmentVariable("MSBuildSdksPath", @"C:\Program Files\dotnet\sdk\2.0.0");

[CamiloTerevinto]

@DustinCampbell I tried with both 2.0.0 and 2.0.1 preview, didn't make a difference. Notice, though, that before setting that variable, it is not set (GetEnvironmentVariable returns null).

Would it possible to run dotnet msbuild with Process or something alike?

[DustinCampbell]

"MSBuildSdksPath" is an override that MSBuild looks for. If set, it will try and use it when handling the "Sdk" attribute. Honestly, it was a bit of a long shot to see if it would work.

Would it possible to run dotnet msbuild with Process or something alike?

I'm not sure what you mean by this.

[CamiloTerevinto]

@DustinCampbell I was referring to something like this: https://docs.microsoft.com/en-us/dotnet/core/tools/cli-msbuild-architecture but running from C#.

Is there any property I can check to see whether the variable is being used at all?

[DustinCampbell]

Is there any property I can check to see whether the variable is being used at all?

Unfortunately, no.

@DustinCampbell I was referring to something like this: https://docs.microsoft.com/en-us/dotnet/core/tools/cli-msbuild-architecture but running from C#.

Sure, I just didn't understand how it's relevant. MSBuildWorkspace uses MSBuild inproc. It's not related to the .NET CLI at all.

[BjarkeMeier]

@DustinCampbell What is the current status? I still have the same problem. Is there any known solution or workaround to get access to the semantic model of a solution (*.sln) having .NET Core projects?

[AlexeiScherbakov]

@BjarkeMeier did you try Microsoft.Build.Locator?

var vsVersions = MSBuildLocator.QueryVisualStudioInstances().ToArray();
var vsVersion = vsVersions.First();
MSBuildLocator.RegisterInstance(vsVersion);

See - https://docs.microsoft.com/ru-ru/visualstudio/msbuild/updating-an-existing-application?view=vs-2019#use-microsoftbuildlocator

[BjarkeMeier]

@AlexeiScherbakov , thanks a lot. It works. This issue should be closed with your answer as the solution.

[AlexeiScherbakov]

I have similar problem, and it takes MANY days before I found answer. It's funny, that problem is solved by MS long time ago, but this feature has advanced usage (for example I use it for custom codegenerator), and only few persons know about it. I subscribed for about 5 similar issues with roslyn to find answer :-) пт, 15 нояб. 2019 г., 11:43 BjarkeMeier <notifications@github.com>:

…

@AlexeiScherbakov <https://github.com/AlexeiScherbakov> , thanks a lot. It works. This issue should be closed with your answer as the solution. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#21660?email_source=notifications&email_token=ACCDWO7GIDVY54J42WUZGC3QTZOK7A5CNFSM4DX4GDC2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEEEXBRY#issuecomment-554266823>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACCDWO2A6T7PMYNPY7DTI5DQTZOK7ANCNFSM4DX4GDCQ> .