Outlook 2016 VSTO 文件夹添加项目事件仅触发一次 [英] Outlook 2016 VSTO Folder Add item event fires only once

问题描述

我有一个插件，我想在邮件发送成功后做点什么，我写:

I have an add-in, I want to do something when the email sent successful, I write:

    private void ThisAddIn_Startup(object sender, System.EventArgs e)
    {
        Outlook.Application application = this.Application;

        var sentMail = Application.Session.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderSentMail);
        sentMail.Items.ItemAdd += new Outlook.ItemsEvents_ItemAddEventHandler(Items_ItemAdd);
    }

    void Items_ItemAdd(object item)
    {
      // do something
    }

但是当我发送第一封电子邮件成功时，我的方法只运行一个，下一封电子邮件不会触发事件.

But my method runs only one when I sent first email success, the next emails not fires event.

请帮帮我！

推荐答案

您正在为隐式局部变量设置事件处理程序.一旦垃圾收集器释放该变量，就不会触发任何事件.您需要有一个全局(类)Items 变量:

You are setting an event handler on a implicit local variable. As soon as that variable is released by the Garbage Collector, no events will fire. You need to have a global (class) Items variable:

private Outlook.Items _items;
private void ThisAddIn_Startup(object sender, System.EventArgs e)
    {
        Outlook.Application application = this.Application;

        _items = Application.Session.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderSentMail).Items;
        _items.ItemAdd += new Outlook.ItemsEvents_ItemAddEventHandler(Items_ItemAdd);
    }

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