How to obtain reference to IVsBrowseObjectContext from VSPackage?

Question

 
I've developed small extension that modifies content of csproj files. I follow standard pattern to get the Project object:
var dte = GetGlobalService(typeof(DTE)) as DTE2
var selectedProjects = (Array)dte.ActiveSolutionProjects;
var project = (Project)selectedProjects.GetValue(0);
However Project interface is not sufficient for my purposes (checking items metadata, reinserting items) and I had to fallback to using MSBuild's Project class like this:
var msBuildProject = new Microsoft.Build.Evaluation.Project(project.FullName);
ModifyProjectsContent(msBuildProject);
msBuildProject.Save();
ProjectCollection
.GlobalProjectCollection
.UnloadProject(msBuildProject);
This chunk of code is executed whenever an item is added/renamed/removed to the project.
This works fine however there is caveat - VS detects that file has been changed and prompts to reload project which bad because I want it to happen silently. This approach also does not play well with batch modifications or source control tools. And finally
it is just ugly.
So I decided to check how others are doing it, in particular how does nuget adds its properties. I found out that it uses UncofiguredProject object that retrieve MSBuildProject as following:
var project = .....
var solution = GetGlobalService(typeof(IVsSolution)) as IVsSolution;
IVsHierarchy hierarchy;
solution.GetProjectOfUniqueName(project.GetUniqueName(), out hierarchy);
var context = project as IVsBrowseObjectContext;
if (context == null)
var hierarchy2 = project as IVsHierarchy;
object extObject;
hierarchy2.GetProperty((uint)VSConstants.VSITEMID.Root, (int)__VSHPROPID.VSHPROPID_ExtObject, out extObject))
Project dteProject = extObject as Project;
context = dteProject.Object as IVsBrowseObjectContext;
var unconfiguredProject = context.UnconfiguredProject : null;
After unconfigureProject is obtained reference to msbuild project obtained like following:
var service = unconfiguredProject.ProjectService.Services.ProjectLockService;
using (var x = await service.WriteLockAsync())
await x.CheckoutAsync(unconfiguredProject.FullPath);
ConfiguredProject configuredProject = await unconfiguredProject.GetSuggestedConfiguredProjectAsync();
var buildProject = await x.GetProjectAsync(configuredProject);
// can modify buildProject here
await x.ReleaseAsync();
await Task.Run(() =>
unconfiguredProject.ProjectService.Services.ThreadingPolicy.SwitchToUIThread();
project.Save();
I tried the same approach however I could not obtain IVsBrowseObjectContext from Project reference.
What am I doing wrong? Why the same code works for nuget but does not work for my extension?

Answer 1

If you want to obtain a reference to the Package object within VSPackage MSVS extension, you can do something like this:
class MyPackage :
Package
    private static
MyPackage _instance;
    public static
MyPackage Instance
        get
            if(_instance
!= null)
                _instance
= new MyPackage();
             return _instance;
class SomeOtherClass
     void Whatever()
           // use MyPackage.Instance