Im trying to get a node by type where one or more categories is choosen on the node. This method is used by calling the api from ajax.

public IList<object> getAllFromCriteria(string categories)
    {
        List<object> resultList = new List<object>();
         try
        {
            string[] categoryList = categories.Split(',');
            List<umbraco.NodeFactory.Node> nodes = uQuery.GetNodesByType("TYPE").Where(x => categoryList.Any(x.GetProperty("PROPERTYALIAS").Value.ToString().Contains)).ToList();
            InServiceFunctions isFunc = new InServiceFunctions();
            resultList = isFunc.MakeListWithObject(nodes);
        }
        catch (Exception e)
        {
             object error = new { error = e };
             resultList.Add(error);
        }
        return resultList;
    }

This always return an error at the line where i try to get the nodes. I have tryed alot of diffrend things here but can't find a solution does anyone know a way to check if string[] list items contains in node property value.

And the property is populated with a Umbraco.MultiNodeTreePicker if this make any different