private string CreateUserNameFilter(string usernameToMatch) { var defaultFilter = configuration.Users.Filter; if (configuration.Users.Attributes.Any()) { return(filterBuilder.AttachAttributeFilters(usernameToMatch, defaultFilter, configuration.Users.RdnAttribute, configuration.Users.Attributes)); } return(filterBuilder.AttachFilter(configuration.Users.RdnAttribute, usernameToMatch, defaultFilter)); }