如何释放Outlook MailItem正确？

Question

我只是无法释放我的Outlook MailItems.打开200 Mails后,Exchange Sever返回达到的最大打开电子邮件数.

我将从所有选定的邮件中删除我的UserProperty.

我的代码:

foreach (var selection in Globals.ThisAddIn.Application.ActiveExplorer().Selection)
{
 if (selection is MailItem)
 {
  MailItem mi = (MailItem)selection;
  UserProperty up = mi.UserProperties.Find("MyProp");
  if (up != null)
  {
   up.Delete();
   //##################################
   // I also tried :
   //----------------------------------
   //    Marshal.ReleaseComObject(up);
   //    up = null;
   //----------------------------------
  }

  mi.Save();

  //##################################
  // I also tried :
  //----------------------------------
  //     mi.Close(OlInspectorClose.olDiscard);
  //----------------------------------


  // I don't know if this loop is necessary, but I have found it somewhere on the web
  while (Marshal.ReleaseComObject(mi) > 0);
  mi = null;

  //##################################
  // I also tried :
  //----------------------------------
  //    GC.Collect();
  //    GC.WaitForPendingFinalizers();
  //----------------------------------
 }
}

知道什么是错的吗？

Answer 1

我相信这就像博卢所说的任何一种错误。再次非常感谢博鲁的帮助。

我现在正在使用以下解决方法：

List entryids = new List();

foreach (var selection in Globals.ThisAddIn.Application.ActiveExplorer().Selection)
{
    MailItem mi = selection as MailItem;
    if (mi != null)
    {
        // For any reason it's not possible to change the mail here

        entryids.Add(mi.EntryID);

        Marshal.ReleaseComObject(mi);
        mi = null;

    }
}

foreach (string id in entryids)
{
    MailItem mi = Globals.ThisAddIn.Application.ActiveExplorer().Session.GetItemFromID(id);

    // My changes on the mail

    mi.Save();
    Marshal.ReleaseComObject(mi);
    mi = null;
}