How to: Display the Select Names Dialog Box to Resolve Recipients

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This example attempts to resolve the recipients provided by the recips parameter, and displays the Outlook Select Names dialog box for each recipient that is ambiguous and cannot be resolved.

Example

This code sample calls the SelectNamesDialog object to display the Select Names dialog box which shows the Outlook address book. Through this dialog box, the user can select a name from the address book. If the name is not resolved, the recipient will be removed from recips. If the name is resolved, then the code sample will return the AddressEntry object of the recipient to recips.

If you use Microsoft Visual Studio to test this code sample, you must first add a reference to the Microsoft Outlook 12.0 Object Library component and specify the Outlook variable when you import the Microsoft.Office.Interop.Outlook namespace. The Imports or using statements must not occur right before the functions in the Code section but must be added before the public Class declaration. The following lines of code show how to do the import and assignment in Visual Basic and in C#:

Imports Outlook = Microsoft.Office.Interop.Outlook

using Outlook = Microsoft.Office.Interop.Outlook;

Private Sub ResolveRecipients(ByVal recips As Outlook.Recipients)
    If recips Is Nothing Then
        Throw New ArgumentNullException()
    End If
    If recips.ResolveAll() Then
        Return
    Else
        For i As Integer = recips.Count To 1 Step -1
            If Not (recips(i).Resolve()) Then
                Dim snd As Outlook.SelectNamesDialog = _
                    Application.Session.GetSelectNamesDialog()
                snd.Recipients.Add(recips(i).Name)
                snd.NumberOfRecipientSelectors = _
                    Outlook.OlRecipientSelectors.olShowTo
                snd.AllowMultipleSelection = False
                snd.Display()
                If Not (snd.Recipients.ResolveAll()) Then
                    recips.Remove(i)
                Else
                    recips.Remove(i)
                    recips.Add(snd.Recipients(1).Address)
                End If
                snd = Nothing
            End If
        Next
    End If
End Sub

private void ResolveRecipients(Outlook.Recipients recips)
{
    if (recips == null)
    {
        throw new ArgumentNullException();
    }
    if (recips.ResolveAll())
    {
        return;
    }
    else
    {
        for (int i = recips.Count; i > 0; i--)
        {
            if (!recips[i].Resolve())
            {
                Outlook.SelectNamesDialog snd =
                    Application.Session.
                    GetSelectNamesDialog();
                snd.Recipients.Add(recips[i].Name);
                snd.NumberOfRecipientSelectors =
                    Outlook.OlRecipientSelectors.olShowTo;
                snd.AllowMultipleSelection = false;
                snd.Display();
                if (!snd.Recipients.ResolveAll())
                {
                    recips.Remove(i);
                }
                else
                {
                    recips.Remove(i);
                    recips.Add(snd.Recipients[1].Address);
                }
                snd = null;
            }
        }
    }
}