WPF Window within VSTO outlook AddIn project

Question

I created a simple VSTO outlook Add-In project and just wanted to have the functionality of a button in outlook would execute a VBA code that would show the WPF window,

when i ran this, Com addin project, with a WinForms it showed the from both via the debug mode via visual studio and by executing the Outlook and clicking the button which ran the VBA code to execute the com addin, however when i changed it to WPF Window it ran fine from the visual studio, by this i mean that i ran the project, it executed the outlook, then i selected an email and clicked the button, which executed the com addin and showed the WPF form, but as soon as i tried this by running outlook (without the VS environment) it through this error over and over again no matter what i have tried .

i attached the outlookAddin project and VBA code in the following link:

https://www.dropbox.com/sh/sbd9upmxthrigha/AACjx2jfmVZKFcqwQfX6SjCJa?dl=0

if i replace this method in TCMSCom.cs file from the existing (Run WPF Form)

    public string OpenConfirmationWizard()
    {

        // run WPF

        TCMSWizard ui = new TCMSWizard();
        ui.ShowDialog();

        // run winforms

        //UserControl1 ui = new UserControl1();
        //ui.ShowDialog();
        return string.Empty;
    }

to this it will run a winforms

    public string OpenConfirmationWizard()
    {
        //TCMSWizard ui = new TCMSWizard();
        //ui.ShowDialog();

        UserControl1 ui = new UserControl1();
        ui.ShowDialog();
        return string.Empty;
    }

stack trace of the first exception in chain: at System.Windows.Window..ctor() at TCMSCOMAddIn.TCMSWizard..ctor() in C:\Users\eranm\Documents\TFS\PI-HF_TCMSCOMAddIn\Features\TCMSCOMAddIn_Phase1\TCMSCOMAddIn\TCMSWizard.xaml.cs:line 23 at TCMSCOMAddIn.TCMSCom.OpenConfirmationWizard() in C:\Users\eranm\Documents\TFS\PI-HF_TCMSCOMAddIn\Features\TCMSCOMAddIn_Phase1\TCMSCOMAddIn\TCMSCom.cs:line 22

stack trace of the last exception in chain: at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind) at MS.Internal.FontCache.Util..cctor()

the exceptions messages in chain are like the following:

"the type initializer for 'system.windows.window' threw an exception"

"The type initializer for 'System.Windows.FrameworkElement' threw an exception."

"The type initializer for 'System.Windows.Documents.TextElement' threw an exception."

"The type initializer for 'MS.Internal.FontCache.Util' threw an exception."

"Invalid URI: The format of the URI could not be determined."

i would appreciate your help in resolving this

many thanks,

Eran

It would really help if you could post the StackTrace and the InnerException of your type initializer exception. — haindl
hi, i add the stack trace of the first and last exceptions and the messages of all exceptions in chain. — Eran Maymony
Check the answer here and check the registry key mentioned here by Microsoft. — haindl

Eran Maymony Eran Maymony · Accepted Answer · 2016-11-15T14:03:36

ok, The bug fixed,

the issue was that the path variable in environment in the registry was set to more than 2048 characters.

WPF Window within VSTO outlook AddIn project

1 Answers