public UserInterfaceContainer(
            Outlook.Inspector inspector,
            Office.Core.CustomTaskPane taskPane,
            IRibbonConnector ribbonConnector)
        {
            if (inspector != null)
            {
                _inspector = inspector;
                _taskPane = taskPane;
                _ribbonConnector = ribbonConnector;

                // 接收 InspectorClose 事件以便我们能够进行清理。
                _inspectorEvents = (Outlook.InspectorEvents_10_Event)_inspector;
                _inspectorEvents.Close +=
                    new Outlook.InspectorEvents_10_CloseEventHandler(
                    _inspectorEvents_Close);
            }
        }
        void _inspectorEvents_Close()
        {
            // 将我们自身从 UI 对象集合中移除,
            // 解除挂钩关闭事件,然后清理所有引用。
            _inspectorEvents.Close -=
                new Outlook.InspectorEvents_10_CloseEventHandler(
                _inspectorEvents_Close);

            if (InspectorClose != null)
            {
                // 告诉所有侦听方我们正在关闭。
                InspectorClose(this, new EventArgs());
            }

            _inspector = null;
            _inspectorEvents = null;
            _taskPane = null;
            _formRegionControls = null;
            _ribbonConnector = null;
        }