c# Outlook外接程序在电子邮件位于已发送邮箱后获取发送日期

using Outlook = Microsoft.Office.Interop.Outlook;

public void GetSentDate()
{
    Outlook.Application outlookApp = new Outlook.Application();
    Outlook.NameSpace outlookNamespace = outlookApp.GetNamespace("MAPI");
    Outlook.MAPIFolder sentFolder = outlookNamespace.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderSentMail);
    Outlook.Items items = sentFolder.Items;

    foreach (Outlook.MailItem mail in items)
    {
        DateTime sentDate = mail.SentOn;
        Console.WriteLine("Sent Date: " + sentDate);
    }
}