/// <summary>
/// Create a list of all visits preceding the supplied visit
/// </summary>
/// <param name="visit">The visit for which the history of visits is requested</param>
/// <returns></returns>
public ICollection <Visit> GetPastVisits(Visit visit)
{
if (visit == null)
{
return(null);
}
var pastVisits = new ObservableCollection <Visit>();
var list = Visits.OrderBy(v => v.PlannedStart);
foreach (var pastVisit in list)
{
if (pastVisit.Id == visit.Id)
{
break;
}
pastVisits.Add(pastVisit);
}
return(pastVisits);
}