public void Test_ObservableCollection_Remove()
{
var list = new ObservableCollection<int>() { 4, 5, 6 };
Assert.Equal(3, list.Count);
list.Remove(4);
Assert.Equal(2, list.Count);
Assert.DoesNotContain(4, list);
var collection = list as ICollection<int>;
Assert.NotNull(collection);
Assert.True(collection.Remove(5));
Assert.Equal(1, collection.Count);
Assert.DoesNotContain(5, list);
list = new ObservableCollection<int>() { 4, 5, 6 };
list.CollectionChanged += (o, e) =>
{
Assert.Same(list, o);
Assert.Equal(NotifyCollectionChangedAction.Remove, e.Action);
Assert.Null(e.NewItems);
Assert.NotNull(e.OldItems);
Assert.Equal(1, e.OldItems.Count);
Assert.Equal(5, e.OldItems[0]);
};
list.RemoveAt(1);
Assert.Equal(2, list.Count);
Assert.DoesNotContain(5, list);
}
static void Main()
{
ObservableCollection<string> items = new ObservableCollection<string>();
items.CollectionChanged += items_CollectionChanged;
items.Add("new item");
items.Add("another item");
items.Add("one more item");
items[1] = "new value";
items.RemoveAt(0);
}
/// <summary>
/// Verifies that the item is removed from a given index in the collection.
/// </summary>
public void RemoveItemAtTest(ReadOnlyObservableCollection<string> readOnlyCol, ObservableCollection<string> collection,
int itemIndex)
{
INotifyPropertyChanged readOnlyPropertyChanged = readOnlyCol;
readOnlyPropertyChanged.PropertyChanged += Collection_PropertyChanged;
_expectedPropertyChanged = new[]
{
new PropertyNameExpected(COUNT),
new PropertyNameExpected(ITEMARRAY)
};
INotifyCollectionChanged readOnlyCollectionChange = readOnlyCol;
readOnlyCollectionChange.CollectionChanged += Collection_CollectionChanged;
string itemAtOldIndex = collection[itemIndex];
_expectedCollectionChangedFired++;
_expectedAction = NotifyCollectionChangedAction.Remove;
_expectedNewItems = null;
_expectedNewStartingIndex = -1;
_expectedOldItems = new string[] { itemAtOldIndex };
_expectedOldStartingIndex = itemIndex;
int expectedCount = collection.Count - 1;
collection.RemoveAt(itemIndex);
Assert.Equal(expectedCount, readOnlyCol.Count);
Assert.Equal(_expectedCollectionChangedFired, _numCollectionChangedFired);
foreach (var item in _expectedPropertyChanged)
Assert.True(item.IsFound, "The propertychanged event should have fired for" + item.Name + ", since we replaced an item");
readOnlyCollectionChange.CollectionChanged -= Collection_CollectionChanged;
readOnlyPropertyChanged.PropertyChanged -= Collection_PropertyChanged;
}
public static void RemoveAtTest_Negative()
{
Guid[] anArray = { Guid.NewGuid(), Guid.NewGuid(), Guid.NewGuid() };
ObservableCollection<Guid> collection = new ObservableCollection<Guid>(anArray);
ReadOnlyObservableCollection<Guid> readonlyCol = new ReadOnlyObservableCollection<Guid>(collection);
((INotifyCollectionChanged)readonlyCol).CollectionChanged += (o, e) => { throw new ShouldNotBeInvokedException(); };
int[] iArrInvalidValues = new Int32[] { -1, -2, -100, -1000, -10000, -100000, -1000000, -10000000, -100000000, -1000000000, Int32.MinValue };
foreach (var index in iArrInvalidValues)
{
Assert.Throws<ArgumentOutOfRangeException>(() => collection.RemoveAt(index));
Assert.Equal(anArray.Length, readonlyCol.Count);
}
int[] iArrLargeValues = new Int32[] { collection.Count, Int32.MaxValue, Int32.MaxValue / 2, Int32.MaxValue / 10 };
foreach (var index in iArrLargeValues)
{
Assert.Throws<ArgumentOutOfRangeException>(() => collection.RemoveAt(index));
Assert.Equal(anArray.Length, readonlyCol.Count);
}
}
public static void RemoveAtTest_Negative()
{
Guid[] anArray = { Guid.NewGuid(), Guid.NewGuid(), Guid.NewGuid() };
ObservableCollection<Guid> collection = new ObservableCollection<Guid>(anArray);
collection.CollectionChanged += (o, e) =>
{
Assert.True(false, "Should not have thrown collection changed event when removing items from invalid indices");
};
int[] iArrInvalidValues = new Int32[] { -1, -2, -100, -1000, -10000, -100000, -1000000, -10000000, -100000000, -1000000000, Int32.MinValue };
foreach (var index in iArrInvalidValues)
{
Assert.Throws<ArgumentOutOfRangeException>(() => collection.RemoveAt(index));
Assert.Equal(anArray.Length, collection.Count);
}
int[] iArrLargeValues = new Int32[] { collection.Count, Int32.MaxValue, Int32.MaxValue / 2, Int32.MaxValue / 10 };
foreach (var index in iArrLargeValues)
{
Assert.Throws<ArgumentOutOfRangeException>(() => collection.RemoveAt(index));
Assert.Equal(anArray.Length, collection.Count);
}
}
public static void RemoveAtTest()
{
Guid[] anArray = { Guid.NewGuid(), Guid.NewGuid(), Guid.NewGuid() };
ObservableCollection<Guid> col0 = new ObservableCollection<Guid>((IEnumerable<Guid>)anArray);
ObservableCollection<Guid> col1 = new ObservableCollection<Guid>((IEnumerable<Guid>)anArray);
ObservableCollection<Guid> col2 = new ObservableCollection<Guid>((IEnumerable<Guid>)anArray);
col0.RemoveAt(0);
string collectionString = "";
foreach (var item in col1)
collectionString += item + ", ";
Assert.False(col0.Contains(anArray[0]), "Collection0 should no longer contain the item: " + anArray[0] + " Collection: " + collectionString);
col1.RemoveAt(1);
collectionString = "";
foreach (var item in col1)
collectionString += item + ", ";
Assert.False(col1.Contains(anArray[1]), "Collection1 should no longer contain the item: " + anArray[1] + " Collection: " + collectionString);
col2.RemoveAt(2);
collectionString = "";
foreach (var item in col2)
collectionString += item + ", ";
Assert.False(col2.Contains(anArray[2]), "Collection2 should no longer contain the item: " + anArray[2] + " Collection: " + collectionString);
string[] anArrayString = { "one", "two", "three", "four" };
ObservableCollection<string> col = new ObservableCollection<string>(anArrayString);
CollectionAndPropertyChangedTester helper = new CollectionAndPropertyChangedTester();
helper.RemoveItemAtTest(col, 1);
}
public async Task OnRemoveNotifyCollectionChangedThenIndexProvided()
{
await ExecuteOnUIThread(() =>
{
var originalCollection = new ObservableCollection<ItemMetadata>();
originalCollection.Add(new ItemMetadata("a"));
originalCollection.Add(new ItemMetadata("b"));
originalCollection.Add(new ItemMetadata("c"));
IViewsCollection viewsCollection = new ViewsCollection(originalCollection, (i) => true);
var eventTracker = new CollectionChangedTracker(viewsCollection);
originalCollection.RemoveAt(1);
var removeEvent = eventTracker.NotifyEvents.Single(e => e.Action == NotifyCollectionChangedAction.Remove);
Assert.IsNotNull(removeEvent);
Assert.AreEqual(1, removeEvent.OldStartingIndex);
});
}
/// <summary>
/// Removes a set of tracks from a given collection of tracks.
/// </summary>
/// <param name="tracksToRemove">The tracks to remove</param>
/// <param name="tracks">The collection from where to remove the tracks</param>
/// <param name="progressDelta">The amount to increase the scanner progressbar for total scan</param>
private void RemoveTracks(SortedList<string, TrackData> tracksToRemove, ObservableCollection<TrackData> tracks, double progressDelta = -1)
{
//double progress = 0;
//double trackDelta = 0;
//if (progressDelta > 0)
//{
// Dispatcher.Invoke(DispatcherPriority.Background, new Action(delegate()
// {
// trackDelta = progressDelta / tracks.Count;
// progress = ScanProgressBar.Value;
// }));
//}
for (int i = 0, j=0; i < tracks.Count; i++,j++)
{
if (tracksToRemove.ContainsKey(tracks[i].Path))
{
Dispatcher.Invoke(DispatcherPriority.Background, new Action(delegate()
{
tracks.RemoveAt(i--);
}));
}
//if (progressDelta > 0)
//{
// if (j % 100 == 0 || (int)progress % 10 == 0)
// Dispatcher.Invoke(DispatcherPriority.Background, new Action(delegate()
// {
// ScanProgressBar.Value += progressDelta;
// }));
// progress += trackDelta;
//}
}
}
/// <summary>
/// Checks the object validation for fields warnings or errors.
/// </summary>
/// <param name="value">The value.</param>
/// <param name="propertyChanged">The property changed.</param>
/// <param name="infoList">The info list containing the warning or error info.</param>
/// <param name="validationType">Type of the validation.</param>
private static void CheckObjectValidationForFields(object value, string propertyChanged, ObservableCollection<FieldWarningOrErrorInfo> infoList,
ValidationType validationType)
{
if (string.IsNullOrEmpty(propertyChanged))
{
infoList.Clear();
}
else
{
for (int i = 0; i < infoList.Count; i++)
{
if (string.Compare(infoList[i].Field, propertyChanged) == 0)
{
infoList.RemoveAt(i);
}
}
}
Dictionary<string, string> fieldWarningsOrErrors = CheckFieldWarningsOrErrors(value, propertyChanged, validationType);
foreach (var fieldWarningOrError in fieldWarningsOrErrors)
{
var fieldWarningOrErrorInfo = new FieldWarningOrErrorInfo(fieldWarningOrError.Key, fieldWarningOrError.Value);
if (!infoList.Contains(fieldWarningOrErrorInfo))
{
infoList.Add(new FieldWarningOrErrorInfo(fieldWarningOrError.Key, fieldWarningOrError.Value));
}
}
}
private void UpdateUnconsumedProperties(CategoryEditor newEditor, ObservableCollection<PropertyEntry> unconsumedProperties)
{
for (int i = unconsumedProperties.Count - 1; i >= 0; i--)
{
if (newEditor.ConsumesProperty(unconsumedProperties[i]))
{
unconsumedProperties.RemoveAt(i);
}
}
}
public void SetItemsSourceAndModifyCollection()
{
// Create the DataGrid and setup its binding
ObservableCollection<string> strings = new ObservableCollection<string>() { "one", "two", "three" };
bool isLoaded = false;
DataGrid dataGrid = new DataGrid();
dataGrid.Loaded += delegate { isLoaded = true; };
// Set the ItemsSource and verify the slot counts
dataGrid.ItemsSource = strings;
dataGrid.SelectedIndex = 0;
Assert.AreEqual(3, dataGrid.SlotCount, "Incorrect SlotCount after setting ItemsSource");
Assert.AreEqual(3, dataGrid.VisibleSlotCount, "Incorrect VisibleSlotCount after setting ItemsSource");
Assert.AreEqual(0, dataGrid.SelectedIndex, "SelectedIndex incorrect");
// Remove an item and verify that the DataGrid is updated
strings.RemoveAt(1);
Assert.AreEqual(2, dataGrid.SlotCount, "Incorrect SlotCount after removing an item");
Assert.AreEqual(2, dataGrid.VisibleSlotCount, "Incorrect VisibleSlotCount after removing an item");
Assert.AreEqual(0, dataGrid.SelectedIndex, "SelectedIndex incorrect after removing an item");
// Add an item and verify that the DataGrid is updated
strings.Add("four");
Assert.AreEqual(3, dataGrid.SlotCount, "Incorrect SlotCount after adding an item");
Assert.AreEqual(3, dataGrid.VisibleSlotCount, "Incorrect VisibleSlotCount after adding an item");
Assert.AreEqual(0, dataGrid.SelectedIndex, "SelectedIndex incorrect after adding an item");
// Insert an item an dverify that the DataGrid is updated
strings.Insert(0, "zero");
Assert.AreEqual(4, dataGrid.SlotCount, "Incorrect SlotCount after inserting an item");
Assert.AreEqual(4, dataGrid.VisibleSlotCount, "Incorrect VisibleSlotCount after inserting an item");
Assert.AreEqual(1, dataGrid.SelectedIndex, "SelectedIndex incorrect after inserting an item");
// Add the DataGrid to the visual tree
TestPanel.Children.Add(dataGrid);
this.EnqueueConditional(delegate { return isLoaded; });
this.EnqueueYieldThread();
this.EnqueueCallback(delegate
{
Assert.AreEqual(4, dataGrid.SlotCount, "Incorrect SlotCount after adding and removing items");
Assert.AreEqual(4, dataGrid.VisibleSlotCount, "Incorrect VisibleSlotCount after adding and removing items");
Assert.AreEqual(1, dataGrid.SelectedIndex, "SelectedIndex was not updated when collection changed");
Assert.AreEqual("one", dataGrid.SelectedItem, "SelectedItem was not updated when collection changed");
DataGridRow row = dataGrid.DisplayData.GetDisplayedRow(0);
Assert.IsNotNull(row);
Assert.AreEqual(0, row.Slot, "Incorrect Row.Slot");
Assert.AreEqual(0, row.Index, "Incorrect Row.Index");
Assert.AreEqual("zero", row.DataContext, "Incorrect Row.DataContext");
row = dataGrid.DisplayData.GetDisplayedRow(1);
Assert.IsNotNull(row);
Assert.AreEqual(1, row.Slot, "Incorrect Row.Slot");
Assert.AreEqual(1, row.Index, "Incorrect Row.Index");
Assert.AreEqual("one", row.DataContext, "Incorrect Row.DataContext");
row = dataGrid.DisplayData.GetDisplayedRow(2);
Assert.IsNotNull(row);
Assert.AreEqual(2, row.Slot, "Incorrect Row.Slot");
Assert.AreEqual(2, row.Index, "Incorrect Row.Index");
Assert.AreEqual("three", row.DataContext, "Incorrect Row.DataContext");
row = dataGrid.DisplayData.GetDisplayedRow(3);
Assert.IsNotNull(row);
Assert.AreEqual(3, row.Slot, "Incorrect Row.Slot");
Assert.AreEqual(3, row.Index, "Incorrect Row.Index");
Assert.AreEqual("four", row.DataContext, "Incorrect Row.DataContext");
});
this.EnqueueTestComplete();
}
// keep inner and outer CollViews' GroupDescription collections in synch
private void SynchronizeGroupDescriptions(NotifyCollectionChangedEventArgs e, ObservableCollection<GroupDescription> origin, ObservableCollection<GroupDescription> clone)
{
if (clone == null)
return; // the clone might be lazily-created _groupBy
int i;
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
Debug.Assert(e.NewStartingIndex >= 0);
if (clone.Count + e.NewItems.Count != origin.Count)
goto case NotifyCollectionChangedAction.Reset;
for (i = 0; i < e.NewItems.Count; i++)
{
clone.Insert(e.NewStartingIndex + i, (GroupDescription) e.NewItems[i]);
}
break;
case NotifyCollectionChangedAction.Remove:
Debug.Assert(e.OldStartingIndex >= 0);
if (clone.Count - e.OldItems.Count != origin.Count)
goto case NotifyCollectionChangedAction.Reset;
for (i = 0; i < e.OldItems.Count; i++)
{
clone.RemoveAt(e.OldStartingIndex);
}
break;
case NotifyCollectionChangedAction.Replace:
Debug.Assert(e.OldStartingIndex >= 0);
if (clone.Count + e.NewItems.Count - e.OldItems.Count != origin.Count)
goto case NotifyCollectionChangedAction.Reset;
// If there are as many new items as old items, then
// this is a straight replace.
if (e.OldItems.Count == e.NewItems.Count)
{
for (i = 0; i < e.OldItems.Count; i++)
{
clone[e.OldStartingIndex + i] = (GroupDescription) e.NewItems[i];
}
}
else
{
for (i = 0; i < e.OldItems.Count; i++)
{
clone.RemoveAt(e.OldStartingIndex);
}
for (i = 0; i < e.NewItems.Count; i++)
{
clone.Insert(e.NewStartingIndex + i, (GroupDescription) e.NewItems[i]);
}
}
break;
case NotifyCollectionChangedAction.Move:
Debug.Assert(e.OldStartingIndex >= 0);
if (clone.Count != origin.Count)
goto case NotifyCollectionChangedAction.Reset;
if (e.OldItems.Count == 1)
{
clone.Move(e.OldStartingIndex, e.NewStartingIndex);
}
else
{
if (e.NewStartingIndex < e.OldStartingIndex)
{
for (i = 0; i < e.OldItems.Count; i++)
{
clone.Move(e.OldStartingIndex + i, e.NewStartingIndex + i);
}
}
else if (e.NewStartingIndex > e.OldStartingIndex)
{
for (i = e.OldItems.Count - 1; i >= 0; i--)
{
clone.Move(e.OldStartingIndex + i, e.NewStartingIndex + i);
}
}
}
break;
// this arm also handles cases where the two collections have gotten
// out of [....] (typically because exceptions prevented a previous [....]
// from happening)
case NotifyCollectionChangedAction.Reset:
CloneList(clone, origin);
break;
default:
throw new NotSupportedException(SR.Get(SRID.UnexpectedCollectionChangeAction, e.Action));
}
}
//ObservableCollectionTest
public static void ObservableCollectionTest()
{
var data = new ObservableCollection<string>();
data.CollectionChanged += new NotifyCollectionChangedEventHandler(DataCollectionChanged);
data.Add("One");
data.Add("Two");
data.Add("Three");
data.Insert(1,"$^^$");
data.RemoveAt(1);
foreach (var tmp in data)
{
Console.WriteLine(tmp);
}
}
public void OnRemoveOfFilterMatchingItemThenViewCollectionRelativeIndexProvided()
{
var originalCollection = new ObservableCollection<ItemMetadata>();
originalCollection.Add(new ItemMetadata("a"));
originalCollection.Add(new ItemMetadata("b"));
originalCollection.Add(new ItemMetadata("c"));
IViewsCollection viewsCollection = new ViewsCollection(originalCollection, (i) => !"b".Equals(i.Item));
var eventTracker = new CollectionChangedTracker(viewsCollection);
originalCollection.RemoveAt(2);
var removeEvent = eventTracker.NotifyEvents.Single(e => e.Action == NotifyCollectionChangedAction.Remove);
Assert.IsNotNull(removeEvent);
Assert.AreEqual(1, removeEvent.OldStartingIndex);
}
/// <summary>
/// Removes tracks with a given filename for a specific collection of tracks
/// </summary>
/// <param name="filename">The filename of the tracks to remove</param>
/// <param name="tracks">The collection of tracks from which to remove</param>
private void RemoveTrack(String filename, ObservableCollection<TrackData> tracks)
{
for (int i = 0; i < tracks.Count; i++)
{
if (tracks[i].Path == filename)
{
tracks.RemoveAt(i);
break;
}
}
}
public void RemovingFromFilteredCollectionDoesNotThrow()
{
var originalCollection = new ObservableCollection<ItemMetadata>();
originalCollection.Add(new ItemMetadata("a"));
originalCollection.Add(new ItemMetadata("b"));
originalCollection.Add(new ItemMetadata("c"));
IViewsCollection viewsCollection = new ViewsCollection(originalCollection, (i) => true);
CollectionViewSource cvs = new CollectionViewSource {Source = viewsCollection};
var view = cvs.View;
try
{
originalCollection.RemoveAt(1);
}
catch (Exception ex)
{
Assert.Fail(ex.Message);
}
}
//我要刺杀函数
public void Kill()
{
CancelSelect();
Step = 3;
IsCenterHeroVisable = true;
CenterHeros = new ObservableCollection<Hero>();
CardRes.Heros.ForEach(x => CenterHeros.Add(x));
CenterHeros.RemoveAt(0);
CenterHeros.RemoveAt(0);
}
