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POEnumerating Outlook Mailbox using Visual Studio
 

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    <p>I have the following class which is intended to return the subject line of all the emails in a folder</p> <p>It is Visual Studio 2008 against Outlook 2007 running on Windows 7 64bit</p> <pre><code>using System; using System.Windows; using System.Collections.Generic; using System.Linq; using System.Text; using Microsoft.Office.Interop.Outlook; namespace MarketingEmails { public class MailUtils { public static string[] processMailMessages(object outlookFolder) // Given an Outlook folder as an object reference, return // a list of all the email subjects in that folder { // Set a local object from the folder passed in Folder theMailFolder = (Folder)outlookFolder; string[] listSubjects = new string[theMailFolder.Items.Count]; int itemCount = 0; // Now process the MAIL items foreach (MailItem oItem in theMailFolder.Items) { listSubjects[itemCount] = oItem.Subject.ToString(); itemCount++; } return listSubjects; } } </code></pre> <p>}</p> <p>However the code throws the exception below:</p> <p>Unable to cast COM object of type 'System.__ComObject' to interface type 'Microsoft.Office.Interop.Outlook.MailItem'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{00063034-0000-0000-C000-000000000046}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).</p> <p>I understand that the error which has occurred because it is trying to process a ReportItem in the selected mailbox. </p> <p>What I don't understand is <strong>why</strong> is it trying ro process non-Mail Items when I have specified:</p> <pre><code>foreach (MailItem oItem in theMailFolder.Items) </code></pre> <p>If I wanted it to process Report Item entries in the mailbox I would have written: </p> <pre><code>foreach (ReportItem oItem in theMailFolder.Items) </code></pre> <p>I would dearly like to find out if this is a bug or if it is just my mis-understanding</p> <p>Regards, Nigel Ainscoe</p>
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