Question

How is it possible to return some kind of list from a WCF service, this the method in my WCF service.

My interface:

[OperationContract]
[WebInvoke(Method = "GET",
 ResponseFormat = WebMessageFormat.Json,
 BodyStyle = WebMessageBodyStyle.Wrapped,
 UriTemplate = "Locations")]
IList<Location> GetLocations();

public IList<Location> GetLocations()
{
   Pazar.Data.Repositories.LocationRepository locRepository = 
       new Pazar.Data.Repositories.LocationRepository();
   return locRepository.GetRootLocations().ToList<Location>();
 }

and this how my GetRootLocations looks like, It returns IQueryable, I wonder if I can maybe return IQueryable from my WCF service?

public IQueryable<Location> GetRootLocations()
{
   IQueryable<Location> locations = GetAll().Where(p => !p.ID_Parent.HasValue).OrderBy(p => p.Sequence);
   return locations;
}

Answer 1

There is no way to return a List from WCF as this is a .NET specific type. WCF is designed to be consumed by any client, not just .NET clients. To get a List on the client, you must take the array that comes across the wire and create a List in your client side code.