Question

我在C＃中开发Office VSTO加载项，在Outlook中查找日历约会，并在其中读取/写入一些数据。

最近，其中一个客户端出现了加载项问题，即他们无法读取/写入日历约会，并引发异常：

操作失败。

异常日志中的信息不多，但我怀疑它们与Exchange存在同步问题。

我问客户，他们说，他们在Outlook中也有一个随机弹出窗口，有时会在与Exchange同步时发生意外。我告诉他们要修理＆＃39; Outlook数据文件，但没有解决问题。

Outlook项目基本上是基于他们的Outlook EntryID s或者一个主题（主题是唯一的，为了简单起见，我翻译了一些代码）

...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.
        }
    }
}

我是如何让应用程序识别这些失败的Exchange同步并以不同方式处理它们的想法？

我仍然希望在这些情况下同步，如果可能的话......（更改Outlook中的本地数据＆＃39;然后让Outlook处理所有内容）

Answer 1

您需要立即释放基础COM对象。完成使用后，使用System.Runtime.InteropServices.Marshal.ReleaseComObject释放Outlook对象。如果您的加载项尝试枚举存储在Microsoft Exchange Server上的集合中超过256个Outlook项目，这一点尤为重要。如果您未及时发布这些对象，则可以达到Exchange对任何时候打开的最大项目数的限制。然后在Visual Basic中将变量设置为Nothing（C＃中为null）以释放对该对象的引用。请在Systematically Releasing Objects文章中详细了解相关内容。

尝试在Exchange安装程序中获取项目时出现C＃Outlook VSTO加载项错误

1 个答案: