c# - VSTO: How to trigger the Check Names action in Active Mail item -

i'm creating microsoft office 2013 add-in behaviour similar address book in active mail item:

i'm working microsoft.office.interop.outlook.mailitem , using recipients property, , recipients.resolveall() method load , remove addresses it, seems work fine until click ok on loaded send control active mail item. @ point outlook goes crazy , doesn't place addresses in or cc, or of them go missing.

i'm thinking 1 solution problem trigger check names when user ready click ok , send addresses form active mail item.

how can trigger action / button?

i couldn't find in mailitem class. similar (but use within poped-out windows form in outloook):

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update:

this bits of code add more context:

i use method addrecipienttoactiveitem each item have. verify if exists (it added), if not resolve , if correct add it.

  private void addrecipienttoactiveitem(string recipientaddress, recipients recipientlist, olmailrecipienttype recipienttype)         {             recipient recipientobject = default(recipient);             if (!string.isnullorwhitespace(recipientaddress) && !emailrecipientalreadyexists(recipientaddress, recipienttype))             {                 recipientobject = recipientlist.add(recipientaddress);                 recipientobject.resolve();                 if (recipientobject.resolved)                 {                     recipientobject.type = (int)recipienttype;                     recipientlist.resolveall();                 }                 else                 {                     recipientobject.delete();                 }             }         } 

for this, have iterate through each element in list of recipients , compare address + type (from,to,cc,bcc) pair:

private bool emailrecipientalreadyexists(string fullemailaddress, olmailrecipienttype recipienttype) {   foreach (microsoft.office.interop.outlook.recipient recipientobject in activemailitem.recipients)         {             if (getrecipientemailaddress(recipientobject) != null)             {                 if (getrecipientemailaddress(recipientobject).equals(fullemailaddress) && recipientobject.type == (int)recipienttype)                     return true;             }         }         return false;    } 

but user can add addresses email item manually, , of them exist in exchange server, others simple smtp address, when comparing have handle both scenarios:

    private string getrecipientemailaddress(microsoft.office.interop.outlook.recipient recipientobject) {     outlook.exchangeuser objexchangeuser = null;                  if (recipientobject.address != null && recipientobject.addressentry != null)             objexchangeuser = recipientobject.addressentry.getexchangeuser();         if (recipientobject.address == null && objexchangeuser == null)             return recipientobject.name;         if (objexchangeuser == null)             return recipientobject.address;         return objexchangeuser.primarysmtpaddress;     }  } 

it seems i've done not enough keep consistent states of email addresses when read them mail item , put them in text box of form, add more addresses , send them mail item , close form, , repeat process.

the namespace class provides getselectnamesdialog method obtains selectnamesdialog object current session. displays select names dialog box user select entries 1 or more address lists, , returns selected entries in collection object specified property selectnamesdialog.recipients.

 sub selectrecipients()    dim omsg mailitem    set omsg = application.createitem(olmailitem)    dim odialog selectnamesdialog    set odialog = application.session.getselectnamesdialog    odialog     .initialaddresslist = _     application.session.getglobaladdresslist     .recipients = omsg.recipients     if .display      'recipients resolved      omsg.subject = "hello"      omsg.send     end if    end   end sub 

the dialog box displayed selectnamesdialog.display similar select names dialog box in outlook user interface. observes size , position settings of built-in select names dialog box. however, default state not show message recipients above to, cc, , bcc edit boxes. more information on using selectnamesdialog object display select names dialog box, see display names address book.