I found a temporary solution.

I found the nsServiceHelper after looking through ~/App_Plugins/NewsLetterStudio/assets/compiled folder.

But i would like to know if there is a better approch, that are more future safe?

I added mailinglist.html to ~/App_Plugins/UmbracoForms/Backoffice/Common/SettingTypes/

<div ng-controller="Custom.SettingTypes.MailingListController">
    <select class="-full-width"
            ng-options="field.value as field.name for field in fields"
            ng-model="mailinglist"
            ng-change="changeValue()">
        <option value="">Choose a mailing list</option>
    </select>
</div>

Added javascript controller file to a package.manifest in a custom pluigin inside ~/App_Plugins/CustomPlugin/

angular.module("umbraco").controller("Custom.SettingTypes.MailingListController",
    function ($scope, $routeParams, notificationsService, nsServiceHelper) {

        function init() {

            if ($scope.setting.value) {
                $scope.mailinglist = $scope.setting.value;
            }

            var formId = $routeParams.id;

            if (formId === -1 && $scope.model && $scope.model.fields) {

            } else {
                nsServiceHelper.http({
                    method: "GET",
                    url: "/backofficeApi/GetAllMailingLists"
                }).success(function (response) {
                    $scope.fields = response;
                    console.log(response);
                    }).error(function () {
                        notificationsService.error("Load failed", "Could not load mailinglists from newsletter studio");
                });
            }
        }

        $scope.changeValue= function () {
            $scope.setting.value = $scope.mailinglist;
        };

        init();

    });

Now i can get the attribute setting inside a WorkFlowType

[Umbraco.Forms.Core.Attributes.Setting("Mailing list", description = "Choose mailinglist to use", view = "mailinglist")]'
public string MailingListId { get; set; }

Hi!

Hmm, nsServiceHelper is basically a "wrapper" around $http that adds some error-handling and stuff.

Since you're only interested in the internal mailing lists (Newsletter Studios own and not any lists from a external Subscription Providers) I think that you're best of by creating your own API controller and return the mailing lists.

You can get them using our "Service Locator", something like this:

GlobalFactory.Current.MailingListRepository.GetAll()

Hope this points you in the right direction?

By the way, there is also some code that you can look at in our Contrib-project: https://github.com/enkelmedia/NewsletterStudioContrib/tree/master/Newsletter%20Studio%20V2/NewsletterStudioContrib/UmbracoForms this is stuff that I created for some Meetup-presentation some years ago but I think that there should be valuable pointers in there.

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