Forking threads in VSTO outlook add-in

I've a toolbar add-in that is intended to add selected mails to a very slow internal archive. At the moment I loop through each email one at a time, which is painfully slow.
Am I allowed to fork a thread for each upload from my add-in and then join when all done? or is that banned from within the Outlook sandbox?

1 Answer
1

Apologies for the lazy question, for anyone who finds it in the future, there's nothing that prevents you from creating threads in a VSTO application. The test sub(s) below can be used to confirm this:

Private Sub Button3_Click(sender As Object, e As RibbonControlEventArgs) Handles Button3.Click

Dim myData As String() = New String() "a", "b", "c"
Debug.WriteLine("Starting")
Using signalEv As CountdownEvent = New CountdownEvent(1)

For Each s As String In myData
signalEv.AddCount()
ThreadPool.QueueUserWorkItem(Sub(state)
Try
ProcessData(state)
Finally
signalEv.Signal()
End Try
End Sub,
s)

Next

signalEv.Signal()
signalEv.Wait()
End Using
Debug.WriteLine("all done")


End Sub
Private Sub ProcessData(s As String)
Debug.WriteLine(Thread.CurrentThread.ManagedThreadId.ToString & " data: " & s)
End Sub


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