如何通過OMAP2身份驗證通過IMAP訪問Gmail的郵件，或者如何在asp.net c＃中使用Gmail API檢索Gmail的郵件？

Question

有什么方法可以通過ASP.NET C＃中的OAUTH2身份驗證通過IMAP訪問Gmail的郵件？

使用谷歌API，我能夠獲得MessageID。 但無法檢索該消息的詳細信息：

var gmailservice = new GmailService(new BaseClientService.Initializer()
                    {
                        HttpClientInitializer = credential,
                        ApplicationName = appName,
                    });
 List<Message> objList = ListMessages(gmailservice, "me", AnyFromEmailAddress);

foreach (Message objM in objList)
 {
     // I can retrieve  objM.Id but how to get message detail?
 }

還是有任何免費的IMAP客戶端使用OAUTH2進行登錄，例如Limilab的Mail.dll

Answer 1

使用NuGet的MailKit和Google的OAuth2框架，您可以這樣做：

using (var client = new ImapClient ()) {
    client.Connect ("imap.gmail.com", 993, true);

    var certificate = new X509Certificate2 (@"C:\path\to\certificate.p12", "password", X509KeyStorageFlags.Exportable);
    var credential = new ServiceAccountCredential (new ServiceAccountCredential.Initializer ("your-developer-id@developer.gserviceaccount.com") {
        // Note: other scopes can be found here: https://developers.google.com/gmail/api/auth/scopes
        Scopes = new[] { "https://mail.google.com/" },
        User = "user@gmail.com"
    }.FromCertificate (certificate));

    // Note: result will be true if the access token was received successfully
    bool result = await credential.RequestAccessTokenAsync (cancel.Token);

    // use the access token as the password string
    client.Authenticate ("user@gmail.com", credential.Token.AccessToken);

    // ...

    client.Disconnect (true);
}