问无法使用Users.messages:修改google选项

EN

/// <summary>
/// This method requests Authentcation from a user using Oauth2.  
/// Credentials are stored in System.Environment.SpecialFolder.Personal
/// Documentation https://developers.google.com/accounts/docs/OAuth2
/// </summary>
/// <param name="clientSecretJson">Path to the client secret json file from Google Developers console.</param>
/// <param name="userName">Identifying string for the user who is being authentcated.</param>
/// <returns>DriveService used to make requests against the Drive API</returns>
public static GmailService AuthenticateOauthGmail(string clientSecretJson, string userName)
{
    try
    {
        if (string.IsNullOrEmpty(userName))
            throw new ArgumentNullException("userName");
        if (string.IsNullOrEmpty(clientSecretJson))
            throw new ArgumentNullException("clientSecretJson");
        if (!File.Exists(clientSecretJson))
            throw new Exception("clientSecretJson file does not exist.");

        // These are the scopes of permissions you need. It is best to request only what you need and not all of them
        string[] scopes = new string[] { GmailService.Scope.GmailSettingsSharing,   //Manage your sensitive mail settings, including who can manage your mail
                                         GmailService.Scope.GmailSettingsBasic,     //Manage your basic mail settings                                 
                                         GmailService.Scope.GmailReadonly,          //View your emails messages and settings
                                         GmailService.Scope.GmailCompose,           //Manage drafts and send emails
                                         GmailService.Scope.GmailInsert,            //Insert mail into your mailbox
                                         GmailService.Scope.GmailLabels,            //Manage mailbox labels
                                         GmailService.Scope.GmailModify,            //View and modify but not delete your email
                                         GmailService.Scope.GmailSend,              //Send email on your behalf
                                         GmailService.Scope.MailGoogleCom};                             //View and manage your mail
        UserCredential credential;
        using (var stream = new FileStream(clientSecretJson, FileMode.Open, FileAccess.Read))
        {
            string credPath = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
            credPath = Path.Combine(credPath, ".credentials/", System.Reflection.Assembly.GetExecutingAssembly().GetName().Name);

            // Requesting Authentication or loading previously stored authentication for userName
            credential = GoogleWebAuthorizationBroker.AuthorizeAsync(GoogleClientSecrets.Load(stream).Secrets,
                                                                     scopes,
                                                                     userName,
                                                                     CancellationToken.None,
                                                                     new FileDataStore(credPath, true)).Result;
        }

        // Create Drive API service.
        return new GmailService(new BaseClientService.Initializer()
        {
            HttpClientInitializer = credential,
            ApplicationName = "Gmail Oauth2 Authentication Sample"
        });
    }
    catch (Exception ex)
    {
        Console.WriteLine("Create Oauth2 account GmailService failed" + ex.Message);
        throw new Exception("CreateServiceAccountGmailFailed", ex);
    }
}

// find the label I want to use.
var findLabel = serviceGmail.Users.Labels.List("me").Execute().Labels.Where(a => a.Name.ToLower().Equals("daimto")).FirstOrDefault();

// search for the mails that I want to add it to
var request = serviceGmail.Users.Messages.List("me");
request.Q = "from:stuff@daimto.com";
request.Execute();

var allmails = request.Execute();           

ModifyMessageRequest mods = new ModifyMessageRequest();
mods.AddLabelIds = new List<string> { allLabels.Id };

// loop though each email.
foreach (var item in allmails.Messages)
   {
   var result = serviceGmail.Users.Messages.Modify(mods, "me", item.Id).Execute();
   }