通過UID搜索MailKit IMAP並下載各個MIME部分

Question

我已經能夠檢索到我檢查的最后一條消息之后的UID列表，因此我只能從IMAP服務器獲取新消息 ：

using(var client = new ImapClient())
{
   //client authentication code...

   var inbox = client.Inbox;
   inbox.Open(FolderAccess.ReadOnly);

   //msgIdx contains the UID of the last message I've checked,
   // so I can retrieve all the new messages after this one.
    var range = new UniqueIdRange(new UniqueId((uint) msgIdx), UniqueId.MaxValue);


    IList<UniqueId> uids = inbox.Search(range, SearchQuery.All);
    foreach(var uid in uids)
    {
       //With the following instruction I download the whole message...
       var message = inbox.GetMessage(uid);
       LblMessageLog.Text += uid + " Subject:" + message.Subject + " []<br/>";
    }
    client.Disconnect(true);
}

問題是我不想下載整個郵件，而只下載特定的附件 ，據我所知，它將始終存在於所有郵件中。

MailKit網站上有一個示例，但它與我上面的搜索有沖突：

foreach (var summary in inbox.Fetch (0, -1, MessageSummaryItems.UniqueId | MessageSummaryItems.BodyStructure)) {
    if (summary.Body is BodyPartMultipart) {
        var multipart = (BodyPartMultipart) summary.Body;

        var attachment = multipart.BodyParts.OfType<BodyPartBasic> ().FirstOrDefault (x => x.FileName == "cert.xml");
        if (attachment != null) {
            // this will download *just* the attachment
            var part = inbox.GetBodyPart (summary.UniqueId, attachment);
        }
    }
}

如何在UID上過濾數據然后僅下載一部分電子郵件的兩個過程？

Answer 1

這是如何混合兩者：

var range = new UniqueIdRange(new UniqueId((uint) msgIdx),    UniqueId.MaxValue);

var items = inbox.Fetch(uids, MessageSummaryItems.UniqueId | MessageSummaryItems.Envelope);
foreach(var item in items)
{
    LblMessage.Text += item.UniqueId + " Subject:" + item.Envelope.Subject + "<br/>";
}

提取方法有一個重載，它接受一個I​​List of UniqueIDs