我正在尝试创建一个响应新附件事件的简单Outlook 2010加载项。下面的代码仅在取消注释MessageBox.Show行时有效。但是删除它后，似乎没有添加事件处理程序。我对程序流程缺少什么，这意味着模式消息框会影响事件处理程序的位置？
public partial class ThisAddIn
{
private void ThisAddIn_Startup(object sender, System.EventArgs e)
{
Application.Inspectors.NewInspector += Inspectors_NewInspector;
}
void Inspectors_NewInspector(Outlook.Inspector Inspector)
{
Outlook.MailItem mailItem = Inspector.CurrentItem as Outlook.MailItem;
if (mailItem != null)
{
if (mailItem.EntryID == null)
{
mailItem.BeforeAttachmentAdd += mailItem_BeforeAttachmentAdd;
//System.Windows.Forms.MessageBox.Show("Twice");
}
}
}
void mailItem_BeforeAttachmentAdd(Outlook.Attachment Attachment, ref bool Cancel)
{
Cancel = true;
}
private void ThisAddIn_Shutdown(object sender, System.EventArgs e)
{
}
引发事件的COM对象必须处于活动状态。在您的情况下，您使用的是多个点符号，并且编译器会创建一个隐式变量。一旦该变量被垃圾回收，它将停止触发事件。邮件项目的同上-您将需要捕获检查器。Close事件并从_mailItems列表中删除邮件；
public partial class ThisAddIn
{
private Inspectors _inspectors;
private List<MailItem> _mailItems = new List<MailItem>();
private void ThisAddIn_Startup(object sender, System.EventArgs e)
{
_inspectors = Application.Inspectors;
_inspectors.NewInspector += Inspectors_NewInspector;
}
void Inspectors_NewInspector(Outlook.Inspector Inspector)
{
Outlook.MailItem mailItem = Inspector.CurrentItem as Outlook.MailItem;
if (mailItem != null)
{
if (mailItem.EntryID == null)
{
_mailItems.Add(mailItem):
mailItem.BeforeAttachmentAdd += mailItem_BeforeAttachmentAdd;
//System.Windows.Forms.MessageBox.Show("Twice");
}
}
}
void mailItem_BeforeAttachmentAdd(Outlook.Attachment Attachment, ref bool Cancel)
{
Cancel = true;
}
private void ThisAddIn_Shutdown(object sender, System.EventArgs e)
{
}
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