System.Runtime.InteropServices.COMException when calling AddFromTemplate

Question

System.Runtime.InteropServices.COMException when calling AddFromTemplate

Rudolf Meier 291

I have written a VS extension (for 2019). It shows a menu point. When it is clicked, I execute this code:

private void Execute(object sender, EventArgs e)
{
ThreadHelper.ThrowIfNotOnUIThread();

dte.SelectedItems.Item(1).Project.ProjectItems.AddFromTemplate("path to vstemplate for a dialog", "TestDialog");

}

Now... this works. It does show the wizard for this template. It does create and add the dialog (or whatever this template should do) ... it does also work for other templates. Everything fine... except, that I get an unhandled System.Runtime.InteropServices.COMException after the call. And... I don't understand why. Is this normal? Do I have to catch it? Is it because of something I'm not doing? ... what is it?

Tianyu Sun-MSFT 34,836 Reputation points Microsoft External Staff

2024-04-22T07:56:16.3933333+00:00

Hello @Rudolf Meier ,

Will this exception be caused due to some permission limitations?

Perhaps you can try to run VS as administrator or test in an experimental instance which was run as administrator.

Rudolf Meier 291

Hi @Tianyu Sun-MSFT ,

No, that's not the problem... the problem seems to be, that when I call AddFromTemplate, the call stack looks like this:

Microsoft.VisualStudio.TemplateWizard.dll!Microsoft.VisualStudio.TemplateWizard.Wizard.Execute(object application, int hwndOwner, ref object[] ContextParams, ref object[] CustomParams, ref EnvDTE.wizardResult retval)

msenv.dll!WizLoadAndRunFileEx(class CFileRepW *,struct tagSAFEARRAY * *,struct tagSAFEARRAY * *,enum VxDTE::wizardResult *)

msenv.dll!<Lambdafunktion>(void)()

msenv.dll!VsSupportErrorInfoSafeInvoke<<Lambdafunktion>(void)>()

msenv.dll!CExtSer::RunWizardFile(unsigned short *,long,struct tagSAFEARRAY * *,enum VxDTE::wizardResult *)

VCProject.dll!CVCExpandableNode::AddWizardOutputToProject(unsigned short const *,unsigned long,unsigned short const * * const,struct HWND__ *,enum __VSADDRESULT *)

VCProject.dll!CAutoItems::AddFromTemplate(unsigned short *,unsigned short *,struct VxDTE::ProjectItem * *)

MyDll.dll!VSMenu.AddSomething.Execute(object sender, System.EventArgs e)

while it looks like this, when I do it via the "add items" and then select the template from the dialog (as you would normally do in Visual Studio)

Microsoft.VisualStudio.TemplateWizard.dll!Microsoft.VisualStudio.TemplateWizard.Wizard.Execute(object application, int hwndOwner, ref object[] ContextParams, ref object[] CustomParams, ref EnvDTE.wizardResult retval)

msenv.dll!WizLoadAndRunFileEx(class CFileRepW *,struct tagSAFEARRAY * *,struct tagSAFEARRAY * *,enum VxDTE::wizardResult *)

msenv.dll!<Lambdafunktion>(void)()

msenv.dll!VsSupportErrorInfoSafeInvoke<<Lambdafunktion>(void)>()

msenv.dll!CExtSer::RunWizardFile(unsigned short *,long,struct tagSAFEARRAY * *,enum VxDTE::wizardResult *)

VCProject.dll!CVCExpandableNode::AddWizardOutputToProject(unsigned short const *,unsigned long,unsigned short const * * const,struct HWND__ *,enum __VSADDRESULT *)

VCProject.dll!CVCExpandableNode::HandleAddItemDlg(enum VSADDITEMOPERATION,unsigned short const *,unsigned long,unsigned short const * * const,struct HWND *,enum __VSADDRESULT *)

VCProject.dll!CVCArchy::DoAddItem(unsigned long,enum VSADDITEMOPERATION,unsigned short const *,unsigned long,unsigned short const * * const,struct HWND *,enum __VSADDRESULT *)

VCProject.dll!CVCArchy::AddItem(unsigned long,enum VSADDITEMOPERATION,unsigned short const *,unsigned long,unsigned short const * * const,struct HWND *,enum __VSADDRESULT *)

Microsoft.VisualStudio.Dialogs.dll!Microsoft.VisualStudio.Dialogs.ServiceHelper.AddNewItem(Microsoft.VisualStudio.TemplateProviders.Templates.IVsTemplate template, string itemLocation, Microsoft.Internal.VisualStudio.Shell.Interop.VSNEWPROJECTDLGCTX context, Microsoft.VisualStudio.Shell.Interop.IVsProject project, uint parentItemId, bool isCodeInSeparateFile, uint newWebItemOptions, bool isSelectMaster, string selectedLanguageForWebItems, Microsoft.VisualStudio.Dialogs.OpenWithEditorSelection openWithParameters, bool useRemoteApi)

or shorter

Microsoft.VisualStudio.TemplateWizard.dll!Microsoft.VisualStudio.TemplateWizard.Wizard.Execute

msenv.dll!WizLoadAndRunFileEx

msenv.dll!CExtSer::RunWizardFile

VCProject.dll!CVCExpandableNode::AddWizardOutputToProject

VCProject.dll!CAutoItems::AddFromTemplate

MyDll.dll!VSMenu.AddSomething.Execute

versus

Microsoft.VisualStudio.TemplateWizard.dll!Microsoft.VisualStudio.TemplateWizard.Wizard.Execute

msenv.dll!WizLoadAndRunFileEx

msenv.dll!CExtSer::RunWizardFile

VCProject.dll!CVCExpandableNode::AddWizardOutputToProject

VCProject.dll!CVCExpandableNode::HandleAddItemDlg

VCProject.dll!CVCArchy::DoAddItem

VCProject.dll!CVCArchy::AddItem

Microsoft.VisualStudio.Dialogs.dll!Microsoft.VisualStudio.Dialogs.ServiceHelper.AddNewItem

The difference is, that via the standard dialog, it enters the VCProject dll via the "CVCArchy::AddItem" which does a "DoAddItem->HandleAddItemDlg->AddWizardOutputToProject" ... while when I enter the VCProject dll via "CAutoItems::AddFromTemplate" it then does directly a "AddWizardOutputToProject"... but, this results in strange COM exceptions.

And, by the way: This also happens when I don't call my template but the "AddClass.vstemplate" which is the most basic template that I can think of.

So... my guess is, that something is wrong (or different) inside the VCProject.dll or how it handles those 2 calls. It could still be something that I'm not doing correctly. But for the moment I don't see what should be wrong with what I do here.