Outlook 加载项中的回复、全部回复和转发事件处理程序消失？

Question

当激活回复/全部回复/转发窗口时，我正在尝试从 Outlook 2007 VSTO 加载项捕获事件。所以我这样做：

private void ThisAddIn_Startup(object sender, System.EventArgs e)
{
    this.Application.ItemLoad += new Microsoft.Office.Interop.Outlook.ApplicationEvents_11_ItemLoadEventHandler(onItemLoad);
}

Outlook.ItemEvents_10_Event gObj_itemEvt = null;

private void onItemLoad(object Item)
{
    gObj_itemEvt = (Outlook.ItemEvents_10_Event)Item;

    gObj_itemEvt.Reply += new Microsoft.Office.Interop.Outlook.ItemEvents_10_ReplyEventHandler(on_Reply);
    gObj_itemEvt.ReplyAll += new Microsoft.Office.Interop.Outlook.ItemEvents_10_ReplyAllEventHandler(on_ReplyAll);
    gObj_itemEvt.Forward += new Microsoft.Office.Interop.Outlook.ItemEvents_10_ForwardEventHandler(on_Forward);
}

private void on_Reply(object Item, ref bool cancel)
{
    //Called when user loads Reply window
    LogMessage("Reply opened");
}

private void on_ReplyAll(object Item, ref bool cancel)
{
    //Called when user loads Reply-All window
    LogMessage("Reply-All opened");
}

private void on_Forward(object Item, ref bool cancel)
{
    //Called when user loads Forward window
    LogMessage("Forward opened");
}

这工作了几次，但随后停止。在这种情况下，我仍然会收到 onItemLoad 事件，但 on_Reply、on_ReplyAll 和 on_Forward 不再广播。

我在这里做错了什么？

Answer 1

您将单个对象定义为Reply、ReplyAll 或Forward 等事件的源。这意味着只能打开一个项目来处理这些事件。让我们想象以下场景，当打开两个项目并触发 ItemLoad 事件时。在第一个项目的情况下，一切顺利，源项目设置正确。但是第二个事件会导致重写源项目，因此您将不再持有对第一个项目的引用，也不会获得它的事件。如果您想处理所有打开的 Outlook 项目的事件，您需要维护一个对象列表而不是单个对象引用：

private void ThisAddIn_Startup(object sender, System.EventArgs e)
{
    this.Application.ItemLoad += new Microsoft.Office.Interop.Outlook.ApplicationEvents_11_ItemLoadEventHandler(onItemLoad);
}

List<Outlook.ItemEvents_10_Event> gObj_itemEvtList = new List<Outlook.ItemEvents_10_Event>();

private void onItemLoad(object Item)
{
    ItemEvents_10_Event gObj_itemEvt = (Outlook.ItemEvents_10_Event)Item;

    gObj_itemEvt.Reply += new Microsoft.Office.Interop.Outlook.ItemEvents_10_ReplyEventHandler(on_Reply);
    gObj_itemEvt.ReplyAll += new Microsoft.Office.Interop.Outlook.ItemEvents_10_ReplyAllEventHandler(on_ReplyAll);
    gObj_itemEvt.Forward += new Microsoft.Office.Interop.Outlook.ItemEvents_10_ForwardEventHandler(on_Forward);

   gObj_itemEvtList.Add(gObj_itemEvt);
}

private void on_Reply(object Item, ref bool cancel)
{
    //Called when user loads Reply window
    LogMessage("Reply opened");
}

private void on_ReplyAll(object Item, ref bool cancel)
{
    //Called when user loads Reply-All window
    LogMessage("Reply-All opened");
}

private void on_Forward(object Item, ref bool cancel)
{
    //Called when user loads Forward window
    LogMessage("Forward opened");
}