public void NotifyCollectionChangedEventArgsConstructor2Test()
{
/* Expected Behavior:
*
* If action is Add, success.
* If action is Remove, success.
* If action is Reset:
* If changedItems is null, success.
* If changedItems is non-null, throw an Argument Exception
* If action is Move or Replace, throw an Argument Exception
*/
IList changedItems = new List <object>();
// Trying with Add
var args = new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, changedItems);
CollectionChangedEventValidators.ValidateAddOperation(args, changedItems, "#B01");
// Trying to add a null array
try
{
GC.KeepAlive(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, null));
Assert.Fail("Cannot call .ctor if changedItems is null.");
}
catch (ArgumentNullException ex)
{
No.Op(ex);
}
// Trying with Remove
args = new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, changedItems);
CollectionChangedEventValidators.ValidateRemoveOperation(args, changedItems, "#B02");
// Trying with Reset (works if changedItems is null)
args = new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset, null);
CollectionChangedEventValidators.ValidateResetOperation(args, "#B03");
try
{
args = new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset, changedItems);
GC.KeepAlive(args);
Assert.Fail("Should not be able to call .ctor with NotifyCollectionChangedAction.Reset.");
}
catch (ArgumentException ex)
{
No.Op(ex);
}
// Trying with Move
try
{
GC.KeepAlive(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Move, changedItems));
Assert.Fail("Should not be able to call .ctor with NotifyCollectionChangedAction.Move.");
}
catch (ArgumentException ex)
{
No.Op(ex);
}
// Trying with Replace
try
{
GC.KeepAlive(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Replace, changedItems));
Assert.Fail("Should not be able to call .ctor with NotifyCollectionChangedAction.Replace.");
}
catch (ArgumentException ex)
{
No.Op(ex);
}
// Add some items, and repeat
changedItems.Add(new object());
changedItems.Add(new object());
changedItems.Add(new object());
// Trying with Add
args = new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, changedItems);
CollectionChangedEventValidators.ValidateAddOperation(args, changedItems, "#B04");
// Trying with Remove
args = new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, changedItems);
CollectionChangedEventValidators.ValidateRemoveOperation(args, changedItems, "#B05");
}
public void NotifyCollectionChangedEventArgsConstructor3Test()
{
/* Expected Behavior:
*
* If action is Add, success.
* If action is Remove, success.
* If action is Reset:
* If changedItem is null, success.
* If changedItem is non-null, throw an Argument Exception
* If action is Move or Replace, throw an Argument Exception
*/
var changedItem = new object();
// Trying with Add
var args = new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, changedItem);
CollectionChangedEventValidators.ValidateAddOperation(args, new[] { changedItem }, "#C01");
// Trying with Remove
args = new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, changedItem);
CollectionChangedEventValidators.ValidateRemoveOperation(args, new[] { changedItem }, "#C02");
// Trying with Reset
args = new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset, (object)null);
CollectionChangedEventValidators.ValidateResetOperation(args, "#C03");
try
{
GC.KeepAlive(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset, changedItem));
Assert.Fail("Should not be able to call .ctor with NotifyCollectionChangedAction.Reset.");
}
catch (ArgumentException ex)
{
No.Op(ex);
}
// Trying with Move
try
{
GC.KeepAlive(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Move, changedItem));
Assert.Fail("Should not be able to call .ctor with NotifyCollectionChangedAction.Move.");
}
catch (ArgumentException ex)
{
No.Op(ex);
}
// Trying with Replace
try
{
GC.KeepAlive(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Replace, changedItem));
Assert.Fail("Should not be able to call .ctor with NotifyCollectionChangedAction.Replace.");
}
catch (ArgumentException ex)
{
No.Op(ex);
}
}
public void ClassTest()
{
// Because the collection cannot change, check to make sure exceptions are thrown for modifications.
List <char> initial = new List <char> ();
initial.Add('A');
initial.Add('B');
initial.Add('C');
ObservableCollection <char> collection = new ObservableCollection <char> (initial);
ReadOnlyObservableCollection <char> readOnlyCollection = new ReadOnlyObservableCollection <char> (collection);
// Test the events
PropertyChangedEventHandler pceh = delegate(object sender, PropertyChangedEventArgs e)
{
Assert.Fail("No properties should change.");
};
NotifyCollectionChangedEventHandler ncceh = delegate(object sender, NotifyCollectionChangedEventArgs e)
{
Assert.Fail("The collection should not change.");
};
((INotifyPropertyChanged)readOnlyCollection).PropertyChanged += pceh;
((INotifyCollectionChanged)readOnlyCollection).CollectionChanged += ncceh;
// Done with the events.
((INotifyPropertyChanged)readOnlyCollection).PropertyChanged -= pceh;
((INotifyCollectionChanged)readOnlyCollection).CollectionChanged -= ncceh;
Assert.AreEqual(3, readOnlyCollection.Count, "RO_1");
CollectionChangedEventValidators.AssertEquivalentLists(initial, readOnlyCollection, "RO_2");
// Modifying the underlying collection
bool propChanged = false;
pceh = delegate(object sender, PropertyChangedEventArgs e)
{
propChanged = true;
};
ncceh = delegate(object sender, NotifyCollectionChangedEventArgs e)
{
CollectionChangedEventValidators.ValidateAddOperation(e, new char []
{ 'I' }, 3, "RO_3");
};
((INotifyPropertyChanged)readOnlyCollection).PropertyChanged += pceh;
((INotifyCollectionChanged)readOnlyCollection).CollectionChanged += ncceh;
// In theory, this will cause the properties to change.
collection.Add('I');
Assert.IsTrue(propChanged, "RO_4");
}
