IMail |
public static Task<IList<IMessageSummary>> FetchAsync( this IMailFolder folder, IList<UniqueId> uids, MessageSummaryItems items, CancellationToken cancellationToken = default )
Exception | Condition |
---|---|
ArgumentNullException | uids is null. |
ArgumentException | One or more of the uids is invalid. |
ObjectDisposedException | The IMailStore has been disposed. |
ServiceNotConnectedException | The IMailStore is not connected. |
ServiceNotAuthenticatedException | The IMailStore is not authenticated. |
FolderNotOpenException | The folder is not currently open. |
OperationCanceledException | The operation was canceled via the cancellation token. |
IOException | An I/O error occurred. |
ProtocolException | The server's response contained unexpected tokens. |
CommandException | The command failed. |
Asynchronously fetches the message summaries for the specified message UIDs.
It should be noted that if another client has modified any message in the folder, the mail service may choose to return information that was not explicitly requested. It is therefore important to be prepared to handle both additional fields on a IMessageSummary for messages that were requested as well as summaries for messages that were not requested at all.
public static void DownloadBodyAndAttachments (string baseDirectory) { using (var client = new ImapClient ()) { client.Connect ("imap.gmail.com", 993, SecureSocketOptions.SslOnConnect); client.Authenticate ("username", "password"); client.Inbox.Open (FolderAccess.ReadOnly); // search for messages where the Subject header contains either "MimeKit" or "MailKit" var query = SearchQuery.SubjectContains ("MimeKit").Or (SearchQuery.SubjectContains ("MailKit")); var uids = client.Inbox.Search (query); // fetch summary information for the search results (we will want the UID and the BODYSTRUCTURE // of each message so that we can extract the text body and the attachments) var items = client.Inbox.Fetch (uids, MessageSummaryItems.UniqueId | MessageSummaryItems.BodyStructure); foreach (var item in items) { // determine a directory to save stuff in var directory = Path.Combine (baseDirectory, item.UniqueId.ToString ()); // create the directory Directory.CreateDirectory (directory); // IMessageSummary.TextBody is a convenience property that finds the 'text/plain' body part for us var bodyPart = item.TextBody; if (bodyPart != null) { // download the 'text/plain' body part var plain = (TextPart) client.Inbox.GetBodyPart (item.UniqueId, bodyPart); // TextPart.Text is a convenience property that decodes the content and converts the result to // a string for us var text = plain.Text; File.WriteAllText (Path.Combine (directory, "body.txt"), text); } // IMessageSummary.HtmlBody is a convenience property that finds the 'text/html' body part for us bodyPart = item.HtmlBody; if (bodyPart != null) { // download the 'text/html' body part var html = (TextPart) client.Inbox.GetBodyPart (item.UniqueId, bodyPart); // TextPart.Text is a convenience property that decodes the content and converts the result to // a string for us var text = html.Text; File.WriteAllText (Path.Combine (directory, "body.html"), text); } // now iterate over all of the attachments and save them to disk foreach (var attachment in item.Attachments) { // download the attachment just like we did with the body var entity = client.Inbox.GetBodyPart (item.UniqueId, attachment); // attachments can be either message/rfc822 parts or regular MIME parts if (entity is MessagePart) { var rfc822 = (MessagePart) entity; var path = Path.Combine (directory, attachment.PartSpecifier + ".eml"); rfc822.Message.WriteTo (path); } else { var part = (MimePart) entity; // default to using the sending client's suggested fileName value var fileName = attachment.FileName; if (string.IsNullOrEmpty (fileName)) { // the FileName wasn't defined, so generate one... if (!MimeTypes.TryGetExtension (attachment.ContentType.MimeType, out string extension)) extension = ".dat"; fileName = Guid.NewGuid ().ToString () + extension; } var path = Path.Combine (directory, fileName); // decode and save the content to a file using (var stream = File.Create (path)) part.Content.DecodeTo (stream); } } } client.Disconnect (true); } }