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Revert "Added Range Manipulation APIs to Collection<T> and Observable…
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…Collection<T> (dotnet#35772)"

This reverts commit b705522.
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@safern
safern committed May 31, 2019
1 parent 792eb85 commit 6711b8d
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Showing 9 changed files with 19 additions and 986 deletions.
159 changes: 6 additions & 153 deletions src/System.ObjectModel/src/System/Collections/ObjectModel/ObservableCollection.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -27,9 +27,6 @@ public class ObservableCollection<T> : Collection<T>, INotifyCollectionChanged,
[NonSerialized]
private int _blockReentrancyCount;

[NonSerialized]
private bool _skipRaisingEvents;

/// <summary>
/// Initializes a new instance of ObservableCollection that is empty and has default initial capacity.
/// </summary>
Expand Down Expand Up @@ -124,95 +121,9 @@ protected override void RemoveItem(int index)

base.RemoveItem(index);

if (!_skipRaisingEvents)
{
OnCountPropertyChanged();
OnIndexerPropertyChanged();
OnCollectionChanged(NotifyCollectionChangedAction.Remove, removedItem, index);
}
}

/// <summary>
/// Called by base class Collection&lt;T&gt; when a count of items is removed from the list;
/// raises a CollectionChanged event to any listeners.
/// </summary>
protected override void RemoveItemsRange(int index, int count)
{
CheckReentrancy();

T[] removedItems = null;

bool ignore = _skipRaisingEvents;
if (!ignore)
{
_skipRaisingEvents = true;

if (count > 0)
{
removedItems = new T[count];
for (int i = 0; i < count; i++)
{
removedItems[i] = this[index + i];
}
}
}

try
{
base.RemoveItemsRange(index, count);
}
finally
{
if (!ignore)
{
_skipRaisingEvents = false;
}
}

if (count > 0 && !_skipRaisingEvents)
{
OnCountPropertyChanged();
OnIndexerPropertyChanged();
OnCollectionChanged(NotifyCollectionChangedAction.Remove, removedItems, index);
}
}

/// <summary>
/// Called by base class Collection&lt;T&gt; when a collection of items is added to list;
/// raises a CollectionChanged event to any listeners.
/// </summary>
protected override void ReplaceItemsRange(int index, int count, IEnumerable<T> collection)
{
CheckReentrancy();

_skipRaisingEvents = true;

T[] itemsToReplace = new T[count - index];
for (int i = index; i < count; i++)
{
itemsToReplace[i] = this[i];
}

try
{
base.ReplaceItemsRange(index, count, collection);
}
finally
{
_skipRaisingEvents = false;
}

if (!_skipRaisingEvents)
{
IList newItems = collection is IList list ? list : new List<T>(collection);

if (newItems.Count > 0)
{
OnCountPropertyChanged();
OnIndexerPropertyChanged();
OnCollectionChanged(NotifyCollectionChangedAction.Replace, itemsToReplace, newItems, index);
}
}
OnCountPropertyChanged();
OnIndexerPropertyChanged();
OnCollectionChanged(NotifyCollectionChangedAction.Remove, removedItem, index);
}

/// <summary>
Expand All @@ -224,51 +135,9 @@ protected override void InsertItem(int index, T item)
CheckReentrancy();
base.InsertItem(index, item);

if (!_skipRaisingEvents)
{
OnCountPropertyChanged();
OnIndexerPropertyChanged();
OnCollectionChanged(NotifyCollectionChangedAction.Add, item, index);
}
}

/// <summary>
/// Called by base class Collection&lt;T&gt; when a collection of items is added to list;
/// raises a CollectionChanged event to any listeners.
/// </summary>
protected override void InsertItemsRange(int index, IEnumerable<T> collection)
{
CheckReentrancy();

bool ignore = _skipRaisingEvents;
if (!ignore)
{
_skipRaisingEvents = true;
}

try
{
base.InsertItemsRange(index, collection);
}
finally
{
if (!ignore)
{
_skipRaisingEvents = false;
}
}

if (!_skipRaisingEvents)
{
IList newItems = collection is IList list ? list : new List<T>(collection);

if (newItems.Count > 0)
{
OnCountPropertyChanged();
OnIndexerPropertyChanged();
OnCollectionChanged(NotifyCollectionChangedAction.Add, newItems, index);
}
}
OnCountPropertyChanged();
OnIndexerPropertyChanged();
OnCollectionChanged(NotifyCollectionChangedAction.Add, item, index);
}

/// <summary>
Expand Down Expand Up @@ -396,14 +265,6 @@ private void OnCollectionChanged(NotifyCollectionChangedAction action, object it
OnCollectionChanged(new NotifyCollectionChangedEventArgs(action, item, index));
}

/// <summary>
/// Helper to raise CollectionChanged event to any listeners
/// </summary>
private void OnCollectionChanged(NotifyCollectionChangedAction action, IList items, int index)
{
OnCollectionChanged(new NotifyCollectionChangedEventArgs(action, items, index));
}

/// <summary>
/// Helper to raise CollectionChanged event to any listeners
/// </summary>
Expand All @@ -420,14 +281,6 @@ private void OnCollectionChanged(NotifyCollectionChangedAction action, object ol
OnCollectionChanged(new NotifyCollectionChangedEventArgs(action, newItem, oldItem, index));
}

/// <summary>
/// Helper to raise CollectionChanged event to any listeners
/// </summary>
private void OnCollectionChanged(NotifyCollectionChangedAction action, IList oldItems, IList newItems, int index)
{
OnCollectionChanged(new NotifyCollectionChangedEventArgs(action, newItems, oldItems, index));
}

/// <summary>
/// Helper to raise CollectionChanged event with action == Reset to any listeners
/// </summary>
Expand Down
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