outlook - Outlook VSTO AddIn 如何避免 RaceOnRCWCleanup

问题描述

我要实现的目标是使用 Inspector 上的 AppProperty Change 事件正确处理日历上的拖放事件：

每当用户与界面交互（Explorer.SelectionChange、NewInspector、CloseInspector 等）时，我都会更新 currentAppointmentItem。每当用户与界面交互（SelectionChange、NewInspector、CloseInspector）时，我都会更新 currentInspector 更新意味着我尝试设置/取消设置相应的事件处理程序和 Marshal.ReleaseComObject。最后将引用归零。

但是，当用户只是单击日历中的 AppointmentItem 时，不会创建 Inspector 窗口。因此我无法捕捉 AppPropertyChange 事件。所以我决定在选定的 AppointmentItem 上调用 GetInspector，以防它不为空。我尝试使用它来接收 AppProperty 事件的更改，以便我可以正确处理日历上的拖放事件

问题：从 Microsoft 文档中，我了解到，每当您丢失对 currentAppointmentItem 的引用时，您还应该使用 Marshal.ReleaseComObject ，否则您会冒其他问题的风险。现在我遇到了我无法捕捉到的异常：RaceOnRCWCleanup ...似乎我试图释放一个仍在使用的 COM 对象（可能由 Outlook 使用）。我怎样才能避免这种情况？Marshal.ReleaseComObject(currentAppointmentItem) 是否正确

我注册了 Outlook.Explorer 上的 SelectionChange 事件。在那里，我尝试使用以下方式注册 currentAppointment：

[...]
            log.Info("Selection_Change");
            if (currentExplorer == null)
            {
                return;
            }

            try
            {
                log.Info("Selection_Change: " + currentExplorer.Caption);
                Outlook.MAPIFolder selectedFolder = currentExplorer.CurrentFolder;
                if (currentExplorer.Selection.Count > 0)
                {
                    Object selObject = currentExplorer.Selection[1];
                    if (selObject is Outlook.AppointmentItem)
                    {
                        currentAppointmentItem = (Outlook.AppointmentItem)selObject;
                        Inspectors_NewInspector(currentAppointmentItem.GetInspector);                     
                    }

[...]

请注意：INspectors_NewInspector 也会在 Inspectors 集合中调用。

NewInspector 的代码就像

    void Inspectors_NewInspector(Microsoft.Office.Interop.Outlook.Inspector Inspector)
            {
                try
                {
                    log.Info("Inspectors_NewInspector");
                    //  This function (apparently) gets kicked off whenever a user opens a new or existing item
                    //  in Outlook (Calendar appointment, Email, etc).  
                    //  We can intercept it, modify it's properties, before letting our Ribbon know about its existance.
                    //            
                    if (Inspector != null)
                    {
                        log.Info("Inspectors_NewInspector: " + Inspector.Caption);
                        unregisterCurrentInspector();
                        currentInspector = Inspector;

                        object item = Inspector.CurrentItem;
                        if (item == null)
                            return;

                        if (!(item is Outlook.AppointmentItem))
                            return;
                        unregisterCurrentAppointmentItem();
                        currentAppointmentItem = (Outlook.AppointmentItem)item;
                        currentAppointmentItem.PropertyChange += AppPropertyChanged; // Handle situations where the 
                                                                                     // user tries to convert an appointment w/ an agreedo protocol to a recurring appointment. 
                                                                                     // This needs to be avoided .                
                        currentAppointmentItem.CustomPropertyChange += AppPropertyChanged;
                    }
                    ((Microsoft.Office.Interop.Outlook.InspectorEvents_10_Event)Inspector).Close += Inspector_Close;

                } catch (Exception ex)
                {
                    log.Error(ex.Message);
                }
            }

unregisterCurrentApppointmentItem ：

private void unregisterCurrentAppointmentItem()
    {
        try
        {
            log.Info("unregisterCurrentAppointmentItem");
            if (currentAppointmentItem != null)
            {
                currentAppointmentItem.PropertyChange -= AppPropertyChanged; // Handle situations where the 
                currentAppointmentItem.CustomPropertyChange -= AppPropertyChanged;

                Marshal.ReleaseComObject(currentAppointmentItem);
                currentAppointmentItem = null;
            }
        } catch (Exception ex)
        {
            log.Error(ex.Message);
        }
    }

unregisterCurrentInspector：

    private void unregisterCurrentInspector()
            {
                log.Info("unregisterCurrentInspector");
                if (currentInspector != null)
                {
                    ((Microsoft.Office.Interop.Outlook.InspectorEvents_10_Event)currentInspector).Close -= Inspector_Close;
                    Marshal.ReleaseComObject(currentInspector);
                    currentInspector = null;
                }
            }

对此有何建议？

我已经尝试/考虑的内容：

标签： outlookvstooutlook-addin

outlook - Outlook VSTO AddIn 如何避免 RaceOnRCWCleanup

问题描述

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