How to assign generic ObservableCollection<T> to ObservableCollection of known T parameter?

Question

I am even not sure, that the question is asked correctly, because I have no idea how to name it. Sorry if confusing, but I will try to explain what I dont know step by step. In my VM one of the methods is calling a service method:

public ObservableCollection<LoadedJockey> Jockeys { get; private set; }
Jockeys = await _updateDataService.UpdateDataAsync(Jockeys, JPlFrom, JPlTo, "updateJockeysPl");

The service method takes argument of type ObservableCollection<T>, so instead of Jockeys can be Horses, Cars, Poneys etc. And inside of my service method I need to assign to ObservableCollection<LoadedJockeys> (known type) that generic collection passed to the parameter, to get something like this:

public async Task<ObservableCollection<T>> UpdateDataAsync<T>(ObservableCollection<T> genericCollection, int idFrom, int idTo, string jobType)
           if (jobType.Contains("Horses"))
           {
                  ObservableCollection<LoadedHorses> horses = genericCollection;
           }
           else if (jobType.Contains("Jockeys"))
           {
                  ObservableCollection<LoadedJockeys> jockeys = genericCollection;
           }

How to do it?

Answer 1

Cast the elements

ObservableCollection<LoadedJockeys> jockeys = 
new ObservableCollection<LoadedJockeys>(genericCollection.Cast<LoadedJockeys>());

or take only the matching elements

ObservableCollection<LoadedJockeys> jockeys = 
new ObservableCollection<LoadedJockeys>(genericCollection.OfType<LoadedJockeys>());