c# - 在 C# 中读取来自 Gmail 的电子邮件

Question

我正在尝试阅读来自 Gmail 的电子邮件。我已经尝试了我能找到的每一个 API/开源项目，但都无法正常工作。

有没有人有工作代码示例，可以让我从 Gmail 帐户验证和下载电子邮件？

下面发布的最终工作版本:https://stackoverflow.com/a/19570553/550198

Answer 1

使用来自:https://github.com/pmengal/MailSystem.NET 的库

这是我的完整代码示例:

电子邮件存储库

using System.Collections.Generic;
using System.Linq;
using ActiveUp.Net.Mail;

namespace GmailReadImapEmail
{
    public class MailRepository
    {
        private Imap4Client client;

        public MailRepository(string mailServer, int port, bool ssl, string login, string password)
        {
            if (ssl)
                Client.ConnectSsl(mailServer, port);
            else
                Client.Connect(mailServer, port);
            Client.Login(login, password);
        }

        public IEnumerable<Message> GetAllMails(string mailBox)
        {
            return GetMails(mailBox, "ALL").Cast<Message>();
        }

        public IEnumerable<Message> GetUnreadMails(string mailBox)
        {
            return GetMails(mailBox, "UNSEEN").Cast<Message>();
        }

        protected Imap4Client Client
        {
            get { return client ?? (client = new Imap4Client()); }
        }

        private MessageCollection GetMails(string mailBox, string searchPhrase)
        {
            Mailbox mails = Client.SelectMailbox(mailBox);
            MessageCollection messages = mails.SearchParse(searchPhrase);
            return messages;
        }
    }
}

用法

[TestMethod]
public void ReadImap()
{
    var mailRepository = new MailRepository(
                            "imap.gmail.com",
                            993,
                            true,
                            "yourEmailAddress@gmail.com",
                            "yourPassword"
                        );

    var emailList = mailRepository.GetAllMails("inbox");

    foreach (Message email in emailList)
    {
        Console.WriteLine("<p>{0}: {1}</p><p>{2}</p>", email.From, email.Subject, email.BodyHtml.Text);
        if (email.Attachments.Count > 0)
        {
            foreach (MimePart attachment in email.Attachments)
            {
                Console.WriteLine("<p>Attachment: {0} {1}</p>", attachment.ContentName, attachment.ContentType.MimeType);
            }
        }
    }
}

---

另一个例子，这次使用MailKit

public class MailRepository : IMailRepository
{
    private readonly string mailServer, login, password;
    private readonly int port;
    private readonly bool ssl;

    public MailRepository(string mailServer, int port, bool ssl, string login, string password)
    {
        this.mailServer = mailServer;
        this.port = port;
        this.ssl = ssl;
        this.login = login;
        this.password = password;
    }

    public IEnumerable<string> GetUnreadMails()
    {
        var messages = new List<string>();

        using (var client = new ImapClient())
        {
            client.Connect(mailServer, port, ssl);

            // Note: since we don't have an OAuth2 token, disable
            // the XOAUTH2 authentication mechanism.
            client.AuthenticationMechanisms.Remove("XOAUTH2");

            client.Authenticate(login, password);

            // The Inbox folder is always available on all IMAP servers...
            var inbox = client.Inbox;
            inbox.Open(FolderAccess.ReadOnly);
            var results = inbox.Search(SearchOptions.All, SearchQuery.Not(SearchQuery.Seen));
            foreach (var uniqueId in results.UniqueIds)
            {
                var message = inbox.GetMessage(uniqueId);

                messages.Add(message.HtmlBody);

                //Mark message as read
                //inbox.AddFlags(uniqueId, MessageFlags.Seen, true);
            }

            client.Disconnect(true);
        }

        return messages;
    }

    public IEnumerable<string> GetAllMails()
    {
        var messages = new List<string>();

        using (var client = new ImapClient())
        {
            client.Connect(mailServer, port, ssl);

            // Note: since we don't have an OAuth2 token, disable
            // the XOAUTH2 authentication mechanism.
            client.AuthenticationMechanisms.Remove("XOAUTH2");

            client.Authenticate(login, password);

            // The Inbox folder is always available on all IMAP servers...
            var inbox = client.Inbox;
            inbox.Open(FolderAccess.ReadOnly);
            var results = inbox.Search(SearchOptions.All, SearchQuery.NotSeen);
            foreach (var uniqueId in results.UniqueIds)
            {
                var message = inbox.GetMessage(uniqueId);

                messages.Add(message.HtmlBody);

                //Mark message as read
                //inbox.AddFlags(uniqueId, MessageFlags.Seen, true);
            }

            client.Disconnect(true);
        }

        return messages;
    }
}

用法

[Test]
public void GetAllEmails()
{
    var mailRepository = new MailRepository("imap.gmail.com", 993, true, "YOUREMAILHERE@gmail.com", "YOURPASSWORDHERE");
    var allEmails = mailRepository.GetAllMails();

    foreach(var email in allEmails)
    {
        Console.WriteLine(email);
    }

    Assert.IsTrue(allEmails.ToList().Any());
}