public void SelectManyTest()
{
var c1 = new ObservableCollection <string>()
{
"Item1",
"Item2",
"Item3",
"Item4",
"Item5",
};
var c2 = new ObservableCollection <ObservableCollection <string> >()
{
c1,
c1,
c1,
};
var o = new SelectManyOperation <IEnumerable <string>, string>(new OperationContext(),
Expression.Call(typeof(Enumerable), "SelectMany", new Type[] { typeof(IEnumerable <string>), typeof(string) },
Expression.Constant(c2),
Expression.Lambda <Func <IEnumerable <string>, IEnumerable <string> > >(
Expression.Parameter(typeof(IEnumerable <string>), "p"),
Expression.Parameter(typeof(IEnumerable <string>), "p"))));
int added = 0;
int removed = 0;
o.CollectionChanged += (s, a) =>
{
switch (a.Action)
{
case NotifyCollectionChangedAction.Add:
added++;
break;
case NotifyCollectionChangedAction.Remove:
removed++;
break;
}
};
c1.Add("Item6");
Assert.AreEqual(3, added);
Assert.AreEqual(0, removed);
c1.Remove("Item6");
Assert.AreEqual(3, added);
Assert.AreEqual(3, removed);
}
public void SelectManyTest()
{
var c1 = new ObservableCollection<string>()
{
"Item1",
"Item2",
"Item3",
"Item4",
"Item5",
};
var c2 = new ObservableCollection<ObservableCollection<string>>()
{
c1,
c1,
c1,
};
var o = new SelectManyOperation<IEnumerable<string>, string>(new OperationContext(),
Expression.Call(typeof(Enumerable), "SelectMany", new Type[] { typeof(IEnumerable<string>), typeof(string) },
Expression.Constant(c2),
Expression.Lambda<Func<IEnumerable<string>, IEnumerable<string>>>(
Expression.Parameter(typeof(IEnumerable<string>), "p"),
Expression.Parameter(typeof(IEnumerable<string>), "p"))));
int added = 0;
int removed = 0;
o.CollectionChanged += (s, a) =>
{
switch (a.Action)
{
case NotifyCollectionChangedAction.Add:
added++;
break;
case NotifyCollectionChangedAction.Remove:
removed++;
break;
}
};
c1.Add("Item6");
Assert.AreEqual(3, added);
Assert.AreEqual(0, removed);
c1.Remove("Item6");
Assert.AreEqual(3, added);
Assert.AreEqual(3, removed);
}