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Showing content from https://www.mimekit.net/docs/html/T_MailKit_BodyPartBasic.htm below:

A basic message body part.

MailKit (in MailKit.dll) Version: 4.12.1

public class BodyPartBasic : BodyPart

The BodyPartBasic type exposes the following members.

Represents any message body part that is not a multipart, message/rfc822 part, or a text part.

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);

        
        var query = SearchQuery.SubjectContains ("MimeKit").Or (SearchQuery.SubjectContains ("MailKit"));
        var uids = client.Inbox.Search (query);

        
        
        var items = client.Inbox.Fetch (uids, MessageSummaryItems.UniqueId | MessageSummaryItems.BodyStructure);

        foreach (var item in items) {
            
            var directory = Path.Combine (baseDirectory, item.UniqueId.ToString ());

            
            Directory.CreateDirectory (directory);

            
            var bodyPart = item.TextBody;

            if (bodyPart != null) {
                
                var plain = (TextPart) client.Inbox.GetBodyPart (item.UniqueId, bodyPart);

                
                
                var text = plain.Text;

                File.WriteAllText (Path.Combine (directory, "body.txt"), text);
            }

            
            bodyPart = item.HtmlBody;

            if (bodyPart != null) {
                
                var html = (TextPart) client.Inbox.GetBodyPart (item.UniqueId, bodyPart);

                
                
                var text = html.Text;

                File.WriteAllText (Path.Combine (directory, "body.html"), text);
            }

            
            foreach (var attachment in item.Attachments) {
                
                var entity = client.Inbox.GetBodyPart (item.UniqueId, attachment);

                
                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;

                    
                    var fileName = attachment.FileName;

                    if (string.IsNullOrEmpty (fileName)) {
                        
                        if (!MimeTypes.TryGetExtension (attachment.ContentType.MimeType, out string extension))
                            extension = ".dat";

                        fileName = Guid.NewGuid ().ToString () + extension;
                    }

                    var path = Path.Combine (directory, fileName);

                    
                    using (var stream = File.Create (path))
                        part.Content.DecodeTo (stream);
                }
            }
        }

        client.Disconnect (true);
    }
}

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