How Can I Add a Range of Items to an ObservableCollection in C#?

ObservableCollection does not support the AddRange method

Overview

This article discusses the lack of support for the AddRange method in ObservableCollection and provides a custom AddRange method implementation to add items in batches and receive notifications for the entire batch.

Custom implementation of AddRange

Since ObservableCollection lacks the AddRange method, a custom implementation is provided to add a range of items. When you add items using the AddRange method, the code iterates through the specified collection and adds each item individually to the ObservableCollection. After all items are added, an event is raised to notify listeners of the changes.

INotifyCollectionChanging interface

Additionally, the INotifyCollectionChanging interface is implemented to provide notification before collection changes occur. This interface raises an event called CollectionChanging, allowing listeners to handle collection changes and possibly cancel operations.

Other range-related functions

In addition to the AddRange method, the custom ObservableRangeCollection class also includes the following range-related functions:

• RemoveRange: Removes a range of items from the collection.
• InsertRange: Inserts a range of items at the specified index.
• Replace: Replaces the entire collection with a single item.
• ReplaceRange: Replaces the entire collection with a range of items.

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