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QuestionHow to reliably exit Outlook using Interop.Outlook? Pin
Server Automator30-Aug-20 14:43
professionalServer Automator30-Aug-20 14:43 
This is the scenario & I was able to make 1/2 of it work: Programmatically launch Outlook 365, send an message & quit Outlook; it must exit. The quitting is the problematic part-- it likes to keep running so I'm thinking I'm not releasing the resources fully forcing it to keep running.

Tons of samples to launch & send a simple message & this is not about that. Outlook 365 has to quit.

This works (simplified for this post though & should be accurate enough): Outlook launches, sends, quits---

using ol = Microsoft.Office.Interop.Outlook;
void Send(string Subject, string EmailBody, string BCC)
{
	ol.Application olOutlook = null;
	ol.MailItem olMsg = null;

	olOutlook = new ol.Application();    //new Outlook app
	olMsg = ( ol.MailItem )olOutlook.CreateItem( ol.OlItemType.olMailItem );
	olMsg.BodyFormat = ol.OlBodyFormat.olFormatHTML;
	olMsg.HTMLBody = EmailBody;
	olMsg.Subject = Subject;
	olMsg.Importance = Microsoft.Office.Interop.Outlook.OlImportance.olImportanceNormal;
        olMsg.BCC = BCC;
		
         olMsg.Send();
					
	System.Runtime.InteropServices.Marshal.FinalReleaseComObject( olMsg );
	olMsg = null;

	System.Runtime.InteropServices.Marshal.FinalReleaseComObject( olOutlook.Session );
	olOutlook.Quit();
	System.Runtime.InteropServices.Marshal.FinalReleaseComObject( olOutlook.Application );
	System.Runtime.InteropServices.Marshal.FinalReleaseComObject( olOutlook );
	olOutlook = null;
	GC.WaitForPendingFinalizers();
	GC.Collect();
	GC.WaitForPendingFinalizers();
	GC.Collect();


Question part 1: Outlook does not quit whenever the EventHandler is subscribed to so the reminders window is suppressed. I'm adding & immediately removing the EventHandler because that's what I've narrowed it down to as the issue for not closing for me. Commenting out the 2 event lines is what's above btw.

using ol = Microsoft.Office.Interop.Outlook;
void Send(string Subject, string EmailBody, string BCC)
{
	ol.Application olOutlook = null;
        
        olOutlook.Reminders.BeforeReminderShow += Reminders_BeforeReminderShow;
        olOutlook.Reminders.BeforeReminderShow -= Reminders_BeforeReminderShow;

	ol.MailItem olMsg = null;

	olOutlook = new ol.Application();    //new Outlook app
	olMsg = ( ol.MailItem )olOutlook.CreateItem( ol.OlItemType.olMailItem );
	olMsg.BodyFormat = ol.OlBodyFormat.olFormatHTML;
	olMsg.HTMLBody = EmailBody;
	olMsg.Subject = Subject;
	olMsg.Importance = Microsoft.Office.Interop.Outlook.OlImportance.olImportanceNormal;
        olMsg.BCC = BCC;
		
         olMsg.Send();
					
	System.Runtime.InteropServices.Marshal.FinalReleaseComObject( olMsg );
	olMsg = null;

	System.Runtime.InteropServices.Marshal.FinalReleaseComObject( olOutlook.Session );
	olOutlook.Quit();
	System.Runtime.InteropServices.Marshal.FinalReleaseComObject( olOutlook.Application );
	System.Runtime.InteropServices.Marshal.FinalReleaseComObject( olOutlook );
	olOutlook = null;
	GC.WaitForPendingFinalizers();
	GC.Collect();
	GC.WaitForPendingFinalizers();
	GC.Collect();


The EventHandler:
private void Reminders_BeforeReminderShow(ref bool Cancel)
{
    Cancel = true;  //suppresses Outlook reminders from opening
}


Part 2 of this question is where I am right now: Once I add an attachment & send the message, Outlook again does not quit.

What am I missing with releasing these resources? Why is adding & then removing this EventHandler causing issues with quitting Outlook? This is tricky because there are a gazillion "how to send mail" posts but much fewer "how to send mail & quit Outlook" posts.

Also, anything related to killing a task is not being considered because that's a dirty shutdown & will only cause deeper issues with mailboxes etc. over time, so don't post it as a solution.

Thank you

Smile | :)
AnswerRe: How to reliably exit Outlook using Interop.Outlook? Pin
Gerry Schmitz31-Aug-20 4:50
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AnswerRe: How to reliably exit Outlook using Interop.Outlook? Pin
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AnswerRe: How to reliably exit Outlook using Interop.Outlook? Pin
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Questionfind TIMES in string of text Pin
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