CODEWITHSUNDEEP
c#eventsevent-handlingvstooutlook-addin
Shakti Prakash Singh
Shakti Prakash Singh

Reputation: 2533

Outlook does not fire the AttachmentAdd event except for one email when multiple emails are composed at the same time

I am writing an Outlook add-in and I am hooking into the AttachmentAdd event of the mailItem. It works as expected when one email is composed but when more than one emails are being composed at the same time, it seems the AttachmentAdd event fires only for the first email to which the attachment is being added.

I am not sure if it has anything to do with the RCW going out of scope.

I am using Outlook 365 64 bit, if that helps.

Here is the code:

public partial class MyAddIn
{
    private void OutlookAddIn_Startup(object sender, System.EventArgs e)
    {
            Application.ItemLoad += NewItem_Load;
    }

    private void NewItem_Load(object item)
    {
        Outlook.MailItem newMailItem = null;

        newMailItem = item as Outlook.MailItem;
        if (newMailItem != null)
        {
            newMailItem.AttachmentAdd -= MailItem_AttachmentAdd;
            newMailItem.AttachmentAdd += MailItem_AttachmentAdd;
        }
    }

    // This gets called only for one email.
    private void MailItem_AttachmentAdd(Outlook.Attachment attachment)
    {
       // Do some stuff here.
    }

    private void OutlookAddIn_Shutdown(object sender, System.EventArgs e)
    {
        Application.ItemLoad -= NewItem_Load;
        // Log
    }

    protected override Microsoft.Office.Core.IRibbonExtensibility CreateRibbonExtensibilityObject()
    {
        return new MyRibbon(this);
    }

    #region VSTO generated code

    
    private void InternalStartup()
    {
        this.Startup += new System.EventHandler(OutlookAddIn_Startup);
        this.Shutdown += new System.EventHandler(OutlookAddIn_Shutdown);
       
        AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException;
    }       
}

Upvotes: 0

Views: 151

Answers (1)

Dmitry Streblechenko
Dmitry Streblechenko

Reputation: 66286

You are setting up events the event handler on a local variable (newMailItem), that will be released at some point after NewItem_Load() exits.

The variable must stay alive to raise events. You could move the declaration to the class level, but you can have more than one open item. Try to create a wrapper class that holds MailItem as its member and store that wrapper in a list.

Upvotes: 1

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