private bool IsReferenceInCycle(Guid projectGuid)
{
// use same logic as C#:
// vsproject\langbuild\langref.cpp
// BOOL CLanguageReferences::IsCircularReference(CLangReference *pclref, BOOL fCalculateDependencies)
int isCircular = 0;
IVsHierarchy otherHier = VsShellUtilities.GetHierarchy(this.ProjectMgr.Site, projectGuid);
IVsSolutionBuildManager2 vsSBM = this.ProjectMgr.GetService(typeof(SVsSolutionBuildManager)) as IVsSolutionBuildManager2;
vsSBM.CalculateProjectDependencies();
vsSBM.QueryProjectDependency(otherHier, this.ProjectMgr.InteropSafeIVsHierarchy, out isCircular);
return(isCircular != 0);
}