public async Task <IEnumerable <IPartyRoleState> > GetAsync(ICriterion filter, IList <string> orders = null, int firstResult = 0, int maxResults = int.MaxValue, IList <string> fields = null)
        {
            IEnumerable <IPartyRoleState> states = null;
            var q = new PartyRolesGetQuery();

            q.FirstResult = firstResult;
            q.MaxResults  = maxResults;
            q.Sort        = PartyRoleProxyUtils.GetOrdersQueryValueString(orders);
            q.Fields      = PartyRoleProxyUtils.GetReturnedFieldsQueryValueString(fields, QueryFieldValueSeparator);
            q.Filter      = PartyRoleProxyUtils.GetFilterQueryValueString(filter);
            var req = new PartyRolesGetRequest();

            req.Query = q;
            var resp = await _ramlClient.PartyRoles.Get(req);

            PartyRoleProxyUtils.ThrowOnHttpResponseError(resp);
            states = (resp.Content == null) ? null : resp.Content.Select(e => e.ToPartyRoleState());
            return(states);
        }