Microsoft.Office.Interop.Outlook.SelectNamesDialog get Email Group

Question

Currently I'm using Outlook Microsoft.Office.Interop.Outlook.SelectNamesDialog to get Contacts, But in the Address Book (Microsoft.Office.Interop.Outlook.SelectNamesDialog) there are group emails also.

I'm looking for a way to get all the emails in that email group?

Answer 1

Here is an example on how to retrieve members from an Exchange Distribution List via SelectNamesDialog selection.

Outlook.SelectNamesDialog names =  Globals.ThisAddIn.Application.Session.GetSelectNamesDialog();
names.SetDefaultDisplayMode(Outlook.OlDefaultSelectNamesDisplayMode.olDefaultMembers);
names.ForceResolution = true;
names.Caption = "Please selection something";
if (names.Display())
{
    Outlook.Recipients recipients = names.Recipients;
    foreach (Outlook.Recipient recipient in recipients)
    {
        Outlook.AddressEntry entry = recipient.AddressEntry;
        if (entry.AddressEntryUserType == Outlook.OlAddressEntryUserType.olExchangeDistributionListAddressEntry)
        {
            Outlook.ExchangeDistributionList list = entry.GetExchangeDistributionList();
            Outlook.AddressEntries members = list.GetExchangeDistributionListMembers();
            foreach (Outlook.AddressEntry member in members)
            {
                Outlook.ExchangeUser user = member.GetExchangeUser();
                string address = user.PrimarySmtpAddress;
            }
        }
    }
}

Once you have the addresses, it would be easily to add them to a collection.

Answer 2

The previous answer will fail for the distribution lists from your Contacts folder. All you need to do is access Recipient.AddressEntry.Members collection (be prepared to handle nulls).