Google drive Offline Access using .net

Question

I need to have to access the google drive from my application. The functionality,i need is when particular user first authenticate the application, i need to have some infor

Answer 1

Googles Client lib will handle all that for you. nuget.org/packages/Google.Apis.Drive.v2 By default its going to use FileDatastore. I recommend making your own implementation of Idatastore and storing the refresh tokens in the database.

Simple example of login to Google Drive. Using the Google.apis.drive.v2

 String CLIENT_ID = "{...}.apps.googleusercontent.com";
            String CLIENT_SECRET = "GeE-cD7PtraV0LqyoxqPnOpv";

            string[] scopes = new string[] { DriveService.Scope.Drive,
                                             DriveService.Scope.DriveFile};
            // here is where we Request the user to give us access, or use the Refresh Token that was previously stored in %AppData%
            UserCredential credential = GoogleWebAuthorizationBroker.AuthorizeAsync(new ClientSecrets { ClientId = CLIENT_ID, ClientSecret = CLIENT_SECRET }
                                                                                    , scopes
                                                                                    , Environment.UserName
                                                                                    , CancellationToken.None
                                                                                    , new FileDataStore("Daimto.GoogleDrive.Auth.Store")).Result;

            DriveService service = new DriveService(new BaseClientService.Initializer()
            {
                HttpClientInitializer = credential,
                ApplicationName = "Drive API Sample",
            });

Filedatastore will store everthing in the %AppData% directory on the server. This really isn't ideal for web applications. I recommend having a look at DatabaseDataStore.cs and altering it for your own uses.

Code ripped from the sample project that goes along with the Google drive API c# tutorial series found here