private ProjectId GetActiveContextProjectIdAndWatchHierarchies(string moniker, IEnumerable <ProjectId> projectIds, IVsHierarchy hierarchy)
{
_foregroundAffinitization.AssertIsForeground();
// First clear off any existing IVsHierarchies we are watching. Any ones that still matter we will resubscribe to.
// We could be fancy and diff, but the cost is probably negligible.
UnsubscribeFromWatchedHierarchies(moniker);
if (hierarchy == null)
{
// Any item in the RDT should have a hierarchy associated; in this case we don't so there's absolutely nothing
// we can do at this point.
return(projectIds.First());
}
void WatchHierarchy(IVsHierarchy hierarchyToWatch)
{
_watchedHierarchiesForDocumentMoniker.Add(moniker, _hierarchyEventSinkCache.GetOrCreate(hierarchyToWatch, h => new HierarchyEventSink(h, this)));
}
// Take a snapshot of the immutable data structure here to avoid mutation underneath us
var projectToHierarchyMap = _workspace._projectToHierarchyMap;
var solution = _workspace.CurrentSolution;
// We now must chase to the actual hierarchy that we know about. First, we'll chase through multiple shared asset projects if
// we need to do so.
while (true)
{
var contextHierarchy = hierarchy.GetActiveProjectContext();
// The check for if contextHierarchy == hierarchy is working around downstream impacts of https://devdiv.visualstudio.com/DevDiv/_git/CPS/pullrequest/158271
// Since that bug means shared projects have themselves as their own owner, it sometimes results in us corrupting state where we end up
// having the context of shared project be itself, it seems.
if (contextHierarchy == null || contextHierarchy == hierarchy)
{
break;
}
WatchHierarchy(hierarchy);
hierarchy = contextHierarchy;
}
// We may have multiple projects with the same hierarchy, but we can use __VSHPROPID8.VSHPROPID_ActiveIntellisenseProjectContext to distinguish
if (ErrorHandler.Succeeded(hierarchy.GetProperty(VSConstants.VSITEMID_ROOT, (int)__VSHPROPID8.VSHPROPID_ActiveIntellisenseProjectContext, out var contextProjectNameObject)))
{
WatchHierarchy(hierarchy);
if (contextProjectNameObject is string contextProjectName)
{
var project = _workspace.GetProjectWithHierarchyAndName(hierarchy, contextProjectName);
if (project != null && projectIds.Contains(project.Id))
{
return(project.Id);
}
}
}
// At this point, we should hopefully have only one project that maches by hierarchy. If there's multiple, at this point we can't figure anything
// out better.
var matchingProjectId = projectIds.FirstOrDefault(id => projectToHierarchyMap.GetValueOrDefault(id, null) == hierarchy);
if (matchingProjectId != null)
{
return(matchingProjectId);
}
// If we had some trouble finding the project, we'll just pick one arbitrarily
return(projectIds.First());
}