/// <summary>
/// Adds <paramref name="element"/> under the specified <paramref name="key"/>. <paramref name="key"/> does not need to exist.
/// </summary>
/// <param name="key">The key to add <paramref name="element"/> under.</param>
/// <param name="element">The element to add.</param>
public void Add(TKey key, TElement element)
{
ObservableGrouping <TKey, TElement> grouping;
if (key == null)
{
grouping = nullGrouping;
if (grouping.Count == 0)
{
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, (object)grouping, this.groupings.Count));
}
}
else if (!this.groupings.TryGetValue(key, out grouping))
{
if (!ReuseGroups || !this.oldGroups.TryRemove(key, out grouping))
{
grouping = new ObservableGrouping <TKey, TElement> (key);
}
this.groupings.Add(key, grouping);
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, (object)grouping, this.groupings.Count - 1));
}
grouping.Add(element);
}
public void Add(TKey key, IEnumerable <TElement> elements)
{
if (elements == null)
{
throw new ArgumentNullException(nameof(elements));
}
ObservableGrouping <TKey, TElement> grouping;
if (key == null)
{
bool wasEmpty = this.nullGrouping.Count == 0;
grouping = nullGrouping;
grouping.AddRange(elements);
if (wasEmpty && this.nullGrouping.Count > 0)
{
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, (object)grouping, this.groupings.Count));
}
}
else if (!this.groupings.TryGetValue(key, out grouping))
{
if (!ReuseGroups || !this.oldGroups.TryRemove(key, out grouping))
{
grouping = new ObservableGrouping <TKey, TElement> (key);
}
grouping.AddRange(elements);
if (grouping.Count == 0)
{
if (ReuseGroups)
{
this.oldGroups.Add(grouping.Key, grouping);
}
return;
}
this.groupings.Add(key, grouping);
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, (object)grouping, this.groupings.Count - 1));
}
}
public void Add(IGrouping <TKey, TElement> grouping)
{
if (grouping == null)
{
throw new ArgumentNullException(nameof(grouping));
}
if (grouping.Key == null)
{
bool wasEmpty = this.nullGrouping.Count == 0;
this.nullGrouping.AddRange(grouping);
if (wasEmpty && this.nullGrouping.Count > 0)
{
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, (object)grouping, this.groupings.Count));
}
return;
}
ObservableGrouping <TKey, TElement> og;
if (!ReuseGroups || !this.oldGroups.TryRemove(grouping.Key, out og))
{
og = new ObservableGrouping <TKey, TElement> (grouping.Key);
}
og.AddRange(grouping);
if (og.Count == 0)
{
if (ReuseGroups)
{
this.oldGroups.Add(grouping.Key, og);
}
return;
}
this.groupings.Add(grouping.Key, og);
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, (object)og, this.groupings.Count - 1));
}
public void Insert(int index, IGrouping <TKey, TElement> grouping)
{
ObservableGrouping <TKey, TElement> og;
if (!ReuseGroups || !this.oldGroups.TryRemove(grouping.Key, out og))
{
og = new ObservableGrouping <TKey, TElement> (grouping.Key);
}
og.AddRange(grouping);
if (og.Count == 0)
{
if (ReuseGroups)
{
this.oldGroups.Add(grouping.Key, og);
}
return;
}
this.groupings.Insert(index, og.Key, og);
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, (object)og, index));
}
