Question

im trying to join those tables i have to use dynamic linq,
it`s working fine if the .Join(dbcontext.Providers) has and returning data
when i dont have data on the .Join(dbcontext.Providers) the all queryResolts returnig 0 results

how can i get data even if one of the join returning 0 results

var queryResolts = dbcontext.Tracks
            // Add Services
            .Join(dbcontext.Services,
                track => track.ServiceId,
                service => service.ServiceId,
                (track, service) => new { Track = track, Service = service })
            // Add ServiceInterfaces
            .Join(dbcontext.ServiceInterfaces,
                ts => ts.Track.ServiceInterfaceId,
                serviceInterface => serviceInterface.ServiceInterfaceId,
                (ts, serviceInterface) => new { Track = ts.Track, Service = ts.Service, ServiceInterfaces = serviceInterface })
            // Add Providers
            .Join(dbcontext.Providers,
                tss => tss.Track.ProviderId,
                provider => provider.ProviderId,
                (tss, provider) => new { Track = tss.Track, Service = tss.Service, ServiceInterfaces = tss.ServiceInterfaces, Providers = provider })
            .Where("ServiceInterfaces.ServiceInterfaceName == @0", "PublishPolicyInterface2")
            .Select(y => y.Track) 

            ;

thanks

miki

Answer 1

Join here works like join in SQL, it will not return any value if the joined table do not contain result.

if your need left or right outer join then use GroupJoin().