public void CountTestWithNoItems()
{
List<int> intList = new List<int>();
PagedCollectionView pcv = new PagedCollectionView(intList);
Assert.AreEqual(0, pcv.Count);
// update the PageSize and verify that we still have a Count of 0.
pcv.PageSize = 10;
Assert.AreEqual(0, pcv.Count);
// update the PageSize during a DeferRefresh and verify that we still have a Count of 0.
pcv.PageSize = 0;
using (pcv.DeferRefresh())
{
pcv.PageSize = 10;
pcv.MoveToPage(1);
}
Assert.AreEqual(0, pcv.Count);
// now try those same tests above with grouping
pcv.GroupDescriptions.Add(new PropertyGroupDescription(""));
pcv.PageSize = 0;
Assert.AreEqual(0, pcv.Count);
// update the PageSize and verify that we still have a Count of 0.
pcv.PageSize = 10;
Assert.AreEqual(0, pcv.Count);
// update the PageSize during a DeferRefresh and verify that we still have a Count of 0.
pcv.PageSize = 0;
using(pcv.DeferRefresh())
{
pcv.PageSize = 5;
}
Assert.AreEqual(0, pcv.Count);
}
public void CannotDeferRefresh()
{
ObservableCollection<TestClass> collection = new ObservableCollection<TestClass>() { new TestClass() };
PagedCollectionView pcv = new PagedCollectionView(collection);
// show that we will throw an exception if we try to change the PageSize while adding
pcv.AddNew();
PagedCollectionViewTest.AssertExpectedException(
new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, PagedCollectionViewResources.OperationNotAllowedDuringAddOrEdit, "DeferRefresh")),
delegate
{
pcv.DeferRefresh();
});
pcv.CancelNew();
// show that we will throw an exception if we try to change the PageSize while editing
pcv.EditItem(pcv[0]);
PagedCollectionViewTest.AssertExpectedException(
new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, PagedCollectionViewResources.OperationNotAllowedDuringAddOrEdit, "DeferRefresh")),
delegate
{
pcv.DeferRefresh();
});
}
