ActiveExplorer().Selection 在 Outlook C# 中返回以前选择的邮件

Question

我有以下代码。当用户点击回复或回复按钮时，它将传递原始电子邮件，该电子邮件将在 SendAndComplete 按钮上进行处理。

public partial class ThisAddIn
    {
        public object selectedObject = null;
        Outlook.MailItem mailItem = null;

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

            //Get this event fire when selection changes
            currentExplorer.SelectionChange += new Outlook.ExplorerEvents_10_SelectionChangeEventHandler(CurrentExplorer_Event);
        }

        public void CurrentExplorer_Event()
        {
            if (this.Application.ActiveExplorer().Selection.Count == 1
             && this.Application.ActiveExplorer().Selection[1] is Outlook.MailItem)
            {

                selectedObject = this.Application.ActiveExplorer().Selection[1];
                mailItem = selectedObject as Outlook.MailItem;
                ((Outlook.ItemEvents_10_Event)mailItem).Reply += new Outlook.ItemEvents_10_ReplyEventHandler(MailItem_Reply);
                ((Outlook.ItemEvents_10_Event)mailItem).ReplyAll += new Outlook.ItemEvents_10_ReplyAllEventHandler(MailItem_ReplyAll);
            }
        }

        void MailItem_Reply(object response, ref bool cancel)
        {
            //No code here

        }

        void MailItem_ReplyAll(object response, ref bool cancel)
        {
            //No code here
        }
    }

现在selectedObject 将在按钮单击时在 Ribbon.cs 上使用。

public void SendnCompleteButton_Click(Office.IRibbonControl control)
        {
            Outlook.Application application = new Outlook.Application();
            var addIn = Globals.ThisAddIn;
            Outlook.MailItem mailItem = addIn.selectedObject as Outlook.MailItem;
            MessageBox.Show(mailItem.Subject + " " + mailItem.ReceivedTime + " " + mailItem.Sender.Name)
        }

消息框显示之前选择的邮件，如何释放之前选择的对象？

谢谢。

Answer 1

首先，无需在功能区按钮的事件处理程序中创建新的 Outlook Application 实例：

Outlook.Application application = new Outlook.Application();

相反，您需要使用Globals.ThisAddIn.Application 属性或仅提供开箱即用的Application 属性的加载项类。

其次，必须在全局范围内声明事件源对象，例如：

Outlook.Explorer currentExplorer;
private void ThisAddIn_Startup(object sender, System.EventArgs e)
        {
            currentExplorer = Application.ActiveExplorer();

            //Get this event fire when selection changes
            currentExplorer.SelectionChange += new Outlook.ExplorerEvents_10_SelectionChangeEventHandler(CurrentExplorer_Event);
        }

第三，在Outlook UI中检查单个项目是否被选中是不正确的。相反，您应该检查是否选择了任何项目：

if (this.Application.ActiveExplorer().Selection.Count > 0)