public void TestingOurOwnIEnumerable()
{
var stops = new Stops();
foreach (var stop in stops)
{
Console.WriteLine(stop);
}
var results = stops.Where(x => x.StopID > 3);
}
public void IEnumerableAsReturnValue()
{
// fyi, constructor populates collection with some stops
Stops stops = new Stops();
// linq returns IEnumerable
IEnumerable <Stop> results = stops.Where(s => s.StopID > 2);
// verify that the IEnumerable results IS a reference to stops
foreach (var result in results)
{
result.StopID = 100;
}
foreach (var stop in stops)
{
Console.WriteLine(stop);
}
// unless .ToList() is used
Stops stops2 = new Stops();
IEnumerable <Stop> results2 = stops.Where(s => s.StopID > 2).ToList();
}
public TrailViewModel(Trail trail)
{
this.trail = trail;
LoadTrailStopAsync();
ItemTappedCommand = new Command((obj) =>
{
StopViewModel stop = obj as StopViewModel;
var stopViews = Stops
.Where(d => d.StopID == stop.StopID)
.Select(d => d)
.Single();
var mainPage = App.Current.MainPage;
var navgation = mainPage.Navigation;
navgation.PushAsync(new Views.StopPage(stopViews));
});
}
public void TestDoesAlteringResultChangeOriginalSequence()
{
var stops = new Stops();
// OrderBy does not alter the original list
var sorted = stops.OrderByDescending(s => s.StopID);
sorted.ElementAt(0).StopID = 88;
var result = stops.Where(x => x.StopID % 2 == 0);
foreach (var evenStop in result)
{
evenStop.StopID = 99;
}
foreach (var stop in stops)
{
Debug.WriteLine(stop);
}
}
public void TestSimpleLambdaWithIEnumerable()
{
Stops stops = new Stops();
var result = stops.Where(x => x.StopID > 3);
}