public GroupingProductListingViewModel(Factories factories, BackgroundWorkerFactory workerFactory)
: base(factories, workerFactory)
{
Grouping = new SortedGroupingViewModel<ProductViewModel, CategoryViewModel, string, string>(this,
() => Products,
keySelector: product => product.Category,
predicate: product => product.Name.ContainsIgnoringCase(search),
choose: Choose,
itemSort: product => product.Name,
groupSort: group => group.Key.Name);
}
public void CanSort()
{
var unsorted = new GroupingViewModel<string, int>(viewModel, () => viewModel.Items,
item => item.Length, item => filterResult, choose);
viewModel.Load();
Assert.AreEqual(4, unsorted.Groups[0].Key);
Assert.AreEqual("foo", unsorted.Groups[1].First());
var sorted = new SortedGroupingViewModel<string, int, string, int>(viewModel, () => viewModel.Items,
item => item.Length, item => filterResult, choose, itemSort: item => item,
groupSort: group => -group.Key);
viewModel.Refresh();
Assert.AreEqual(4, sorted.Groups[0].Key);
Assert.AreEqual("bar", sorted.Groups[1].First());
}
