Outlook上下文菜单,已选择多个日历事件

事实证明,使用“ContextMenuMultipleItems”idMso可以与添加的“getVisible”方法一起工作。我的XML现在看起来像:

<?xml version="1.0" encoding="utf-8"?>
<customUI onLoad="Ribbon_Load" xmlns="http://schemas.microsoft.com/office/2009/07/customui" loadImage="GetImage">
  <contextMenus>    
    <contextMenu idMso="ContextMenuCalendarItem">
        <button id="MyContextMenuCalendarItem"
            label="Copy To Google Calendar"
                        image="Google_Calendar_Logo.png"
            onAction="CopyToGoogleCalendar_Click"/>
    </contextMenu>  
    <contextMenu idMso="ContextMenuMultipleItems">
        <button id="MyContextMenuMultipleItems" 
            label="Copy To Google Calendar" 
                        image="Google_Calendar_Logo.png"
                        getVisible="ContextMenuMultipleItems_IsVisible"
            onAction="CopyToGoogleCalendar_Click"/>
    </contextMenu>   
    </contextMenus>     
</customUI>

ContextMenuMultipleItems\u IsVisible如下所示:

public bool ContextMenuMultipleItems_IsVisible(Office.IRibbonControl control)
{
    if (control.Context is Outlook.Selection)
    {
        Outlook.Selection selection = control.Context as Outlook.Selection;
        if (selection[1] is Outlook.AppointmentItem)
            return true;
    }
    return false;
}