public async Task <IEnumerable <IPermissionState> > GetChildrenAsync(string parentId, ICriterion filter, IList <string> orders = null, int firstResult = 0, int maxResults = int.MaxValue, IList <string> fields = null)
{
IEnumerable <IPermissionState> states = null;
var q = new PermissionTreesGetQuery();
var parentIdObj = (parentId);
q.ParentId = parentIdObj;
q.FirstResult = firstResult;
q.MaxResults = maxResults;
q.Sort = PermissionProxyUtils.GetOrdersQueryValueString(orders);
q.Fields = PermissionProxyUtils.GetReturnedFieldsQueryValueString(fields, QueryFieldValueSeparator);
q.Filter = PermissionProxyUtils.GetFilterQueryValueString(filter);
var req = new PermissionTreesGetRequest();
req.Query = q;
var resp = await _ramlClient.PermissionTrees.Get(req);
PermissionProxyUtils.ThrowOnHttpResponseError(resp);
states = resp.Content;
return(states);
}