Specified cast is not valid

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J

Janni

I'm developing a VSTO (second edition) addin for Outlook. One of my

customers gets the following error:

"System.InvalidCastException: Specified cast is not valid.

at

System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal

(Int32 errorCode, IntPtr errorInfo)

at

System.Runtime.InteropServices.CustomMarshalers.EnumerableViewOfDispatch.GetEnumerator

()

at System.Collections.IEnumerable.GetEnumerator() "

when looping through the items in the calendar folder.

Dim oFolder As MsOutlook.MAPIFolder = oSession.GetDefaultFolder

(Outlook.OlDefaultFolders.olFolderCalendar)

Dim oItems As MsOutlook.Items = m_oFolder.Items

For Each oItem As Object In oItems

> ...

Next

Anyone who has any clue about the cause of this error?
 
What line is the exception thrown on? Is it in the For Each line?

Does the exception get thrown if the code is changed to use a normal For

loop with a loop counter?

Dim count as Integer = oItems.Count

Dim i As Integer

For i = 1 To count

' code here

Next

"Janni" <janni.kajbrink@hotmail.com> wrote in message

news:11495981-e5ec-4efa-b616-c698bef62550@g37g2000yqn.googlegroups.com...
> I'm developing a VSTO (second edition) addin for Outlook. One of my
> customers gets the following error:

> "System.InvalidCastException: Specified cast is not valid.
> at
> System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal
> (Int32 errorCode, IntPtr errorInfo)
> at
> System.Runtime.InteropServices.CustomMarshalers.EnumerableViewOfDispatch.GetEnumerator
> ()
> at System.Collections.IEnumerable.GetEnumerator() "

> when looping through the items in the calendar folder.

> Dim oFolder As MsOutlook.MAPIFolder = oSession.GetDefaultFolder
> (Outlook.OlDefaultFolders.olFolderCalendar)
> Dim oItems As MsOutlook.Items = m_oFolder.Items

> For Each oItem As Object In oItems
> ...
> Next

> Anyone who has any clue about the cause of this error?
>
 
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