事件处理程序未添加到新的邮件项目 [英] Event Handler not being added to new Mail Items
问题描述
我正在尝试创建一个响应新的附件事件的简单的Outlook 2010加载项。
以下代码仅在我取消注释MessageBox.Show行时有效。但是删除它似乎不添加事件处理程序。我缺少程序流程,意味着模态消息框会影响事件处理程序的位置?
I'm trying to create a simple Outlook 2010 add-in that responds to new attachment events. The code below only works when I uncomment the MessageBox.Show line. But with it removed it appears not to add the event handler. What am I missing about the program flow that means that a modal message box affect the placement of event handlers?
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)
{
}
推荐答案
引发事件的COM对象必须存活。在你的情况下,你使用多个点符号,编译器创建一个隐式变量;一旦该变量被垃圾回收,它将停止触发事件。同样的邮件项目 - 您将需要捕获检查员。关闭事件并从_mailItems列表中删除项目;
The COM object that raises the events must be alive. In your case you are using multiple dot notation and the compiler creates an implicit variable; once that variable is garbage collected, it will stop firing events. Ditto for the mail items - you will need to trap the inspector.Close event and remove the items from the _mailItems list;
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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