I'm trying to get a list of the available users from the Core Service. I spend quite some time looking at the available service methods and the most obvious seemed to be this:
TrusteesFilterData trusteesFilterData = new TrusteesFilterData
{
BaseColumns = ListBaseColumns.IdAndTitle,
IsPredefined = false,
ItemType = ItemType.User
};
XElement listTrustees = client.GetSystemWideListXml(trusteesFilterData);
However, the code throws an error when calling GetSystemWideListXml - Unable to create Abstract Class
. Am I using the correct approach and, if so what am I doing wrong? If not, what should I be doing instead?