WpfObservableRangeCollection

Provides ObservableRangeCollection and its WPF version, including AddRange, InsertRange, RemoveRange/RemoveAll, Replace/ReplaceRange methods for bulk operation to avoid frequent update notification events.

NuGet Package Manager

PM> Install-Package WpfObservableRangeCollection

.NET CLI

dotnet add package WpfObservableRangeCollection

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Classes

• ObservableRangeCollection: An ObservableCollection that supports bulk operations to avoid frequent update notification events.

  Forked from weitzhandler/rangeobservablecollection-cs

• WpfObservableRangeCollection: WPF version of ObservableRangeCollection with CollectionView support.

  Forked from weitzhandler/wpfobservablerangecollection-cs

Usage

var collection = new WpfObservableRangeCollection<int>(); collection.AddRange(Enumerable.Range(0,10));

{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }

collection.RemoveRange(index: 5, count: 3);

{ 0, 1, 2, 3, 4, 5, 6, 7 8, 9 }

// You can also receive the return value to get the number of items that were successfully removed. // removed here is 2. int removed = collection.RemoveRange(new[] { 1, 3, 5 });

{ 0, 1 2, 3 4, 8, 9 }

collection.InsertRange(index: 2, collection: Enumerable.Range(10, 7));

{ 0, 2, 10, 11, 12, 13, 14, 15, 16, 4, 8, 9 }

// This method is roughly equivalent to RemoveRange, then InsertRange. // When index and count are equal to 0, it is equivalent to InsertRange(0, collection). // changed here is 0. int changed = collection.ReplaceRange(index: 6, count: 3, new[] { -1, -2, -3 });

{ 0, 2, 10, 11, 12, 13, -1, -2, -3, 4, 8, 9 }

// Clears the current collection and replaces it with the specified item. collection.Replace(42);

{ 42 }

• If duplicate items are not allowed in the collection, set AllowDuplicates = false, and you can specify the Comparer = xxx.
• Most of the extended methods have return values to indicate changes in the number of collections.

Why WpfObservableRangeCollection?

See ObservableCollection Doesn't support AddRange method, so I get notified for each item added, besides what about INotifyCollectionChanging? - StackOverflow

I've searched the web for some ObservableCollections that have *Range methods, but they all raise various exceptions(and some strange problems) in certain specific situations:

• System.NotSupportedException: Range actions are not supported.
• System.InvalidOperationException: The "x" index in the collection change event is not valid for collections of size "y".
• More? I'm not sure. I forgot.

In the end, I chose weitzhandler/RangeObservableCollection and weitzhandler/WpfObservableRangeCollection and made slight changes to the code, and finally, I didn't encounter any problems, for now.

If the NotSupportedException still occurred, try using BindingOperations.EnableCollectionSynchronization(IEnumerable, Object).

Seealso

• Cysharp/ObservableCollections
• ENikS/ObservableCollectionEx
• XamarinCommunityToolkit/src/CommunityToolkit/Xamarin.CommunityToolkit/ObjectModel/ObservableRangeCollection.shared.cs