C#からOutlookを操作

「メールを受信したときに実行するプログラム」と「メールボックス内のフォルダ情報やinbox内にあるメールを表示する」サンプルコードです。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Office.Interop.Outlook;

namespace OutlookExample
{
    public class OutlookExample
    {
        public static void RunOutlookExample()
        {
            ApplicationClass appClass = new ApplicationClass();
            appClass.NewMail += new ApplicationEvents_10_NewMailEventHandler(outLookApp_NewMailEx);

            PrintInbox(appClass);
        }

        private static void outLookApp_NewMailEx(string EntryIDCollection)
        {
            // do something nice when mail is coming
        }

        public static void PrintInbox(ApplicationClass o)
        {
            // get items in my inbox (using MAPI)
            NameSpace outlookNS = o.GetNamespace("MAPI");
            MAPIFolder inboxFolder
              = outlookNS.GetDefaultFolder(OlDefaultFolders.olFolderInbox);
            foreach (MAPIFolder folder in outlookNS.Folders)
            {
                Console.WriteLine(folder.Name);
                foreach (MAPIFolder subFolder in folder.Folders)
                {
                    Console.WriteLine("  " + subFolder.Name);
                }
            }

            // print out some basic info. 
            Console.WriteLine("You have {0} e-mails in your box", inboxFolder.Items.Count);
            Console.WriteLine();

            // save as txt (assume the mail format is html)
            int i = 0;
            foreach (object obj in inboxFolder.Items)
            {
                i++;
                MailItem item = obj as MailItem;
                if (item != null)
                {
                    Console.WriteLine("  Received: {0}", item.ReceivedTime.ToString());
                    Console.WriteLine("  Sender: {0}",   item.SenderName);
                    Console.WriteLine("  Subject: {0}",  item.Subject);
                    item.SaveAs(@"c:\temp\message" + i + ".txt", OlSaveAsType.olHTML);
                    Console.WriteLine();
                }
            }
        }
    }
}