System.Reflection.ReflectionTypeLoadException when calling Microsoft.CodeAnalysis.MSBuild.MSBuildWorkspace.Create().OpenProjectAsync

[shaggygi]

Version Used:
Visual Studio 2017 RC4
Microsoft.CodeAnalysis NuGet package 2.0.0-rc4

Steps to Reproduce:

1. Create new WPF app (.NET 4.6.1)
2. Add CodeAnalysis package from NuGet
3. Add code (I did within an async Button Click event.

Project project = await Microsoft.CodeAnalysis.MSBuild.MSBuildWorkspace.Create().OpenProjectAsync(@"C:\Projects\WpfApp4\WpfApp4\WpfApp4.csproj");

4. Run/debug code.

Expected Behavior:
Should be able to load a Project object.

Actual Behavior:
Get the following error.

System.Reflection.ReflectionTypeLoadException occurred
HResult=0x80131602
Message=Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
Source=mscorlib
StackTrace:
at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module)
at System.Reflection.RuntimeAssembly.get_DefinedTypes()
at System.Composition.Hosting.ContainerConfiguration.b__0(Assembly a)
at System.Linq.Enumerable.d__162.MoveNext() at System.Composition.TypedParts.TypedPartExportDescriptorProvider..ctor(IEnumerable1 types, AttributedModelProvider attributeContext)
at System.Composition.Hosting.ContainerConfiguration.CreateContainer()
at Microsoft.CodeAnalysis.Host.Mef.MefHostServices.Create(IEnumerable`1 assemblies)
at Microsoft.CodeAnalysis.Host.Mef.DesktopMefHostServices.get_DefaultServices()
at Microsoft.CodeAnalysis.MSBuild.MSBuildWorkspace.Create()
at WpfApp4.MainWindow.<Test_OnClick>d__2.MoveNext() in c:\Projects\WpfApp4\WpfApp4\MainWindow.xaml.cs:line 38

I couldn't repro this. What's the value of the LoaderExceptions property? (see the Message above)

[shaggygi]

I tried this in VS 2015 with similar results. I looked in the View Detail dialog. @0xd4d Were you asking for the data under the LoaderExceptions? It shows the following, does that help?

[System.Exception {System.IO.FileNotFoundException}]
{"Could not load file or assembly 'Microsoft.Build, Version=15.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.":"Microsoft.Build, Version=15.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"}

[shaggygi]

OK, it looks like I got it to work, but had to download a few other NuGet packages.

Microsoft.Build
Microsoft.Build.Framework
Microsoft.Build.Tasks.Core

I guess my question now is why would these not already be included or not pulled down when getting Microsoft.CodeAnalysis? Is it because of VS RC and RC packages?

[Pilchie]

Yes, this is related to #15056, but we should probably add dependencies to our packages now. Tagging @mattwar

[shaggygi]

Thank you

[kristersz]

I get the same issue on a machine running VS 2015.3 while trying to call MSBuildWorkspace.Create(). I have added Microsoft.Build and Microsoft.Build.Tasks.Core NuGet packages both v15.1.1012 to the project. I have no issues running the application on a machine with VS 2017 installed. Anything I am missing?

LoaderExceptions:
Could not load file or assembly 'Microsoft.Build, Version=15.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

Could not load file or assembly 'Microsoft.Build.Tasks.Core, Version=15.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

[rigofunc]

I get the same issue on VS2017 running on Windows 10 while trying to call var workspace = MSBuildWorkspace.Create();

var workspace = MSBuildWorkspace.Create();
var solution = workspace.OpenSolutionAsync(_slnPath).Result;

_documents = new List<Document>();

foreach (var projectId in solution.ProjectIds)
{
    var project = solution.GetProject(projectId);
    foreach (var documentId in project.DocumentIds)
    {
        var document = solution.GetDocument(documentId);
        if (document.SupportsSyntaxTree)
        {
            _documents.Add(document);
        }
    }
}