无法获取有关 MailItem 的任何信息

Question

我有一个 outlook 插件，它运行一堆文件夹，将它们保存到磁盘并将它们移动到垃圾文件夹。

我添加的代码适用于 99% 的电子邮件。一堆try缓存是调试用的，请无视

它每天提取几千封邮件，适用于所有内容，但一个文件夹中的邮件除外。

我检查项目是否为 MailItems 并且所有内容都已检查完毕，但是当我尝试在其上获取属性时，它会给我这种类型的错误。

No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE))

10:57:51 AM: at Microsoft.Office.Interop.Outlook._MailItem.get_ReceivedTime()

方法会根据我尝试访问的内容而变化。

一段时间以来一直在寻找解决方案，但无济于事。

请帮忙。

 while (unreadFolders.Count > 0 && count < COUNT)
            {
                Outlook.Folder currentFolder = unreadFolders.FirstOrDefault().Key;
                string path = unreadFolders.FirstOrDefault().Value;
                Debug.WriteLine("reading folder: " + currentFolder.Name);
                unreadFolders.Remove(currentFolder);

                Outlook.Folder parent = GetParent(currentFolder);
                var t = parent?.FullFolderPath;
                //replenish the list
                foreach (Outlook.Folder f in currentFolder.Folders) unreadFolders.Add(f, path + "\" + f.Name);

                //create directory if it doesnt exist
                Directory.CreateDirectory(path);

                Outlook.Items items = currentFolder.Items;
                foreach (var item in items)
                {
                    if (item != null && item is Outlook.MailItem)
                    {
                        if (count++ > COUNT) break;
                        var mailItem = (Outlook.MailItem)item;
                        if (mailItem == null) continue;
                        var fullpath = path + "\";
                        try
                        {
                            fullpath += "[(R)" + mailItem.ReceivedTime.ToWeirdDateFormat() + "]";
                        }
                        catch (Exception ex)
                        {
                            using (StreamWriter file = new StreamWriter(@"C:\temp\logs.txt", true))
                            {
                                file.WriteLine(DateTime.Now.ToLongTimeString() + ":\t\tReceived Time Broken");
                                file.WriteLine(DateTime.Now.ToLongTimeString() + ":\t\t" + ex.Message);
                                file.WriteLine(DateTime.Now.ToLongTimeString() + ":\t\t" + ex.StackTrace);
                            }
                        }
                        try
                        {
                            fullpath += "[(T)" + mailItem.To.MakeWindowsSafe() + "]";
                        }
                        catch (Exception ex)
                        {
                            using (StreamWriter file = new StreamWriter(@"C:\temp\logs.txt", true))
                            {
                                file.WriteLine(DateTime.Now.ToLongTimeString() + ":\t\tTo Broken");
                                file.WriteLine(DateTime.Now.ToLongTimeString() + ":\t\t" + ex.Message);
                                file.WriteLine(DateTime.Now.ToLongTimeString() + ":\t\t" + ex.StackTrace);
                            }
                        }
                        try
                        {
                            fullpath += "[(F)" + mailItem.SenderName.MakeWindowsSafe() + "]";
                        }
                        catch (Exception ex)
                        {
                            using (StreamWriter file = new StreamWriter(@"C:\temp\logs.txt", true))
                            {
                                file.WriteLine(DateTime.Now.ToLongTimeString() + ":\t\tSender name Broken");
                                file.WriteLine(DateTime.Now.ToLongTimeString() + ":\t\t" + ex.Message);
                                file.WriteLine(DateTime.Now.ToLongTimeString() + ":\t\t" + ex.StackTrace);
                            }
                        }
                        try
                        {
                            fullpath += "[+][(S)" + mailItem.Subject.MakeWindowsSafe() + "]";
                        }
                        catch (Exception ex)
                        {
                            using (StreamWriter file = new StreamWriter(@"C:\temp\logs.txt", true))
                            {
                                file.WriteLine(DateTime.Now.ToLongTimeString() + ":\t\tSubject Broken");
                                file.WriteLine(DateTime.Now.ToLongTimeString() + ":\t\t" + ex.Message);
                                file.WriteLine(DateTime.Now.ToLongTimeString() + ":\t\t" + ex.StackTrace);
                            }
                        }
                        fullpath += ".msg";
                        //save message to directory
                        mailItem.SaveAs(fullpath, Outlook.OlSaveAsType.olMSG);

                        //move message to deleted
                        if (parent == null)
                        {
                            using (StreamWriter file = new StreamWriter(@"C:\temp\logs.txt", true))
                            {
                                file.WriteLine(DateTime.Now.ToLongTimeString() + ":\t\tParent Null");
                                file.WriteLine(DateTime.Now.ToLongTimeString() + ":\t\t" + currentFolder.FullFolderPath);
                            }
                        }
                        else
                        {
                            mailItem.Move(parent.Folders["Deleted Items"]);
                        }
                    }
                }
            }

Answer 1

检查 MailItem.Class 属性的值 - 它可能是 46 (OlObjectClass.olReport)（而 MailItem.MessageClass 将是 REPORT.IPM.Note.NDR）。无法投递的报告消息是 ReportItem 对象，但它们可能会被视为 MailItem 对象，从而通过您的评估。

还要确保您使用反向 for 计数器循环，因为您可能通过将项目移动到另一个文件夹来修改集合（加上 for each 循环不适合用于 Outlook 对象）。对保存 Outlook 对象的变量调用 Marshal.ReleaseCOMObject 也是一个好主意。

无法获取有关 MailItem 的任何信息

Failing to get any info on MailItem

c#

outlook

outlook-addin

outlook-2013