/// <summary>
/// Adds the elements of the specified collection to the end of the <see cref="ObservableSortedCollection{T}"/>.
/// </summary>
/// <param name="collection">The collection whose elements should be added to the end of the <see cref="ObservableSortedCollection{T}"/>.
/// The collection itself cannot be null, but it can contain elements that are null, if type <typeparamref name="T"/> is a reference type.</param>
/// <exception cref="ArgumentNullException"><paramref name="collection"/> is null.</exception>
public void AddRange(IEnumerable<T> collection)
{
if (collection == null)
{
throw new ArgumentNullException("collection");
}
// The items to be added in sorted order
var changedItems = new SortedArray<T>(this.Comparer);
changedItems.AddAll(collection);
if (changedItems.Count != 0)
{
// Since changedItems are already sorted, use AddSorted instead of AddAll
this.items.AddSorted(changedItems);
var startingIndex = this.IndexOf(changedItems[0]);
this.OnPropertyChanged(nameof(this.Count));
this.OnPropertyChanged(IndexerName);
this.OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, new List<T>(changedItems), startingIndex));
}
}
