public static async Task <IActionResult> Run(
        [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest req,
        ILogger log, [TokenStoreBinding(Token_url = "https://sample-token-store.tokenstore.azure.net/services/dropbox/tokens/sampleToken",
                                        Auth_flag = "msi")] TokenBindingOutput tokenbindingoutput) // set input binding parameters
    {
        log.LogInformation("C# HTTP trigger function processed a request.");

        var filesList = new List <string>();

        if (!string.IsNullOrEmpty(tokenbindingoutput.outputToken)) // If token is avaliable, list dropbox directories/files
        {
            using (var dbx = new DropboxClient(tokenbindingoutput.outputToken))
            {
                var list = await dbx.Files.ListFolderAsync(string.Empty);

                // show folders then files
                foreach (var item in list.Entries.Where(i => i.IsFolder))
                {
                    filesList.Add($"{item.Name}/");
                }

                foreach (var item in list.Entries.Where(i => i.IsFile))
                {
                    filesList.Add($"{item.Name} \n");
                }
            }
        }
        System.Text.StringBuilder sb = new System.Text.StringBuilder();
        foreach (var file in filesList)
        {
            sb.Append(file);
        }
        return((ActionResult) new OkObjectResult($"Files: \n {sb.ToString()}"));
    }
    public static async void Run([TimerTrigger("*/1 * * * * * ")] TimerInfo myTimer, ILogger log,
                                 [TokenStoreBinding(Token_url = "https://sample-token-store.tokenstore.azure.net/services/dropbox/tokens/sampleToken",
                                                    Auth_flag = "msi")] TokenBindingOutput tokenbindingoutput) // update binding inputs
    {
        // timer triggered every second (note: may be slowed down since this is an async method)
        log.LogInformation($"C# Timer trigger function executed at: {DateTime.Now}");

        if (!string.IsNullOrEmpty(tokenbindingoutput.outputToken))
        {
            using (var dbx = new DropboxClient(tokenbindingoutput.outputToken))
            {
                var list = await dbx.Files.ListFolderAsync(string.Empty);


                // show folders then files
                foreach (var item in list.Entries.Where(i => i.IsFolder))
                {
                    log.LogInformation($"Directory: {item.Name}");
                }

                foreach (var item in list.Entries.Where(i => i.IsFile))
                {
                    log.LogInformation($"File: {item.Name}");
                }
            }
        }
    }