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rangedobservablecollection's Introduction

RangedObservableCollection

Build status NuGet NuGet Pre Release

A small extension to ObservableCollection that allows for multiple items to be added, removed or replaced in a single operation.

RangedObservableCollection

A small extension to ObservableCollection that allows for multiple items to be added, removed or replaced in a single operation.

This library is simple and just adds a few extra methods:

var collection = new RangedObservableCollection<int>();

// bulk add
var itemsToAdd = new [] { 1, 2, 3, 4, 5 };
collection.AddRange(itemsToAdd);

// bulk remove
var itemsToRemove = new [] { 1, 2, 3, 4, 5 };
collection.RemoveRange(itemsToRemove);

// bulk clear and add
var itemsToReplace = new [] { 1, 2, 3, 4, 5 };
collection.ReplaceRange(itemsToReplace);

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rangedobservablecollection's Issues

Range actions are not supported Exception

I replaced my ObservableCollection with this one and I get

System.NotSupportedException: 'Range actions are not supported.'

on line

OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, changedItems, startIndex));

Using WPF and .NET 4.8. Am I missing something?

Edit: more info:

Stack Trace

at System.Windows.Data.ListCollectionView.ValidateCollectionChangedEventArgs(NotifyCollectionChangedEventArgs e)
at System.Windows.Data.ListCollectionView.ProcessCollectionChanged(NotifyCollectionChangedEventArgs args)
at System.Collections.ObjectModel.ObservableCollection1.OnCollectionChanged(NotifyCollectionChangedEventArgs e) at System.Collections.ObjectModel.RangedObservableCollection1.AddRange(IEnumerable`1 collection) in D:...\RangedObservableCollection.cs:line

when I try

List<object> templist = new List<object>();
...
FilesCollection.AddRange(templist);

AddRange should avoid sending notifications if no items added

AddRange() should probably avoid sending the property changed notifications if the passed in collection is empty and no items are added. I ran into some downstream index out-of-range exceptions in a UWP app when AddRange() was called and no items were added to a collection that was already empty.

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