尝试在Exchange安装程序中获取项目时出现C#Outlook VSTO加载项错误 [英] C# Outlook VSTO add-in error while trying to get item in an Exchange setup

问题描述

我正在用C#开发Office VSTO加载项，该加载项在Outlook中查找日历约会，并在其中读取/写入一些数据.

I'm developing an Office VSTO add-in in C# which looks up calendar appointments in Outlook, and reads/writes some data in them.

最近，其中一位客户的外接程序有问题，即他们无法读/写日历约会，并且抛出异常:

Recently, one of the clients had issues with the add-in, namely they can't read/write the calendar appointment, and it throws an exception :

操作失败.

The operation failed.

异常日志中没有太多信息，但我怀疑它们与Exchange存在同步问题.

There's not much info from the exception log, but I suspect they have synchronization problems with Exchange.

我问客户，他们说，他们在Outlook中也有一个随机弹出窗口，有时在与Exchange同步时发生意外时会发生这种情况.我告诉他们修复" Outlook数据文件，但这并不能解决问题.

I asked the client, and they said, that they also have a random popup in Outlook as well, which sometimes happens when there's a mishap while syncing with Exchange. I told them to 'repair' the Outlook data files, but that didn't fix the problem.

基本上根据Outlook的Outlook EntryID 或主题(主题是唯一的，为了简单起见，我翻译了一些代码)来查找Outlook项目

The outlook items are basically looked up based on their Outlook EntryIDs OR a Subject (the subjects are unique, and for the sake of simplicity I translated the code a little bit)

...main alghorythm...
    Outlook.AppointmentItem calAppointment = null;
    calAppointment = SearchforCalendarMatch(EntryID, Subject); //we try to find either by EntryID or by Subject
    if (calAppointment != null)
    {
        calAppointment.Start = StartDate;
        calAppointment.End = FinishDate;
        calAppointment.Body = Notes;
        calAppointment.Save(); //we're changing the found calendar appointment here
    }
...

public Outlook.AppointmentItem SearchforCalendarMatch(String EntryID, String Subject)
{
    Outlook.NameSpace ns = null;
    Outlook.MAPIFolder calendarFolder = null;
    Outlook.Items calendarFolderItems = null;
    Outlook.Items filteredcalendarFolderItems = null;
    Outlook.AppointmentItem calAppointment = null;

    Outlook.Application OutlookApp = new Outlook.Application();
    outlookversion = OutlookApp.Version;
    ns = OutlookApp.Session;

    //Try to find the calendar appointment by the EntryID
    dynamic OutlookItem = ns.GetItemFromID(t.Text28);
    if (OutlookItem != null)
    {
        if (OutlookItem is Outlook.AppointmentItem)
        {
            Outlook.AppointmentItem foundItem = (Outlook.AppointmentItem)OutlookItem;
            return foundItem;
        }
    }

    //If the EntryID was missing, we try to find the calendar appointment by the Subject. 
    //(original code is very long, and there are multiple things here, but let's just assume that 100% sure that the subject is unique, so it will find it)
    String SubjectMatch = "[Subject] = '" + Subject + "'";
    filteredcalendarFolderItems = calendarFolderItems.Restrict(SubjectMatch);
    for (int i = 1; i <= filteredcalendarFolderItems.Count; i++)
    {
        //appointment has to be one of these
        calAppointment = (Microsoft.Office.Interop.Outlook.AppointmentItem)filteredcalendarFolderItems[i];
        if (!calAppointment.IsConflict) //conflict check here, not sure if it helps at all
        {
            return calAppointment; //this is not the complete code, but this is the basic idea of it.
        }
    }
}

有什么想法可以使应用程序识别这些失败的Exchange同步，并以不同的方式处理它们?

Any ideas how I could make the application recognize these failed Exchange syncs, and handle them differently?

如果可能的话，我仍然想在这些情况下进行同步...(在Outlook中更改本地数据"，然后让Outlook处理所有内容)

I would still like to sync in these cases, if it's possible... (change the 'local data' in Outlook, then let Outlook handle everything from that on)

推荐答案

您需要立即释放基础COM对象.使用 System.Runtime.InteropServices.Marshal.ReleaseComObject 以在使用完Outlook对象后将其释放.如果您的加载项尝试枚举Microsoft Exchange Server上存储的集合中的256个以上Outlook项目，则这一点尤其重要.如果不及时释放这些对象，则可以达到Exchange对任意一次打开的最大项目数施加的限制.然后在Visual Basic中将变量设置为Nothing(在C#中为null)以释放对该对象的引用.在系统地发布对象文章.

You need to release underlying COM objects instantly. Use System.Runtime.InteropServices.Marshal.ReleaseComObject to release an Outlook object when you have finished using it. This is particularly important if your add-in attempts to enumerate more than 256 Outlook items in a collection that is stored on a Microsoft Exchange Server. If you do not release these objects in a timely manner, you can reach the limit imposed by Exchange on the maximum number of items opened at any one time. Then set a variable to Nothing in Visual Basic (null in C#) to release the reference to the object. Read more about that in the Systematically Releasing Objects article.

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