Standard: Collection<T> and ObservableCollection<T> do not support ranges

[ChaseFlorell]

This is taken directly from https://github.com/dotnet/corefx/issues/10752 [by @robertmclaws]

This API change is already approved in .netcore (tentatively scheduled for 3.0), and I think it's equally as important to be available in .netstandard

    // Adds a range to the end of the collection.
    // Raises CollectionChanged (NotifyCollectionChangedAction.Add)
    public void AddRange(IEnumerable<T> collection) => InsertItemsRange(0, collection);

    // Inserts a range
    // Raises CollectionChanged (NotifyCollectionChangedAction.Add)
    public void InsertRange(int index, IEnumerable<T> collection) => InsertItemsRange(index, collection);

    // Removes a range.
    // Raises CollectionChanged (NotifyCollectionChangedAction.Remove)
    public void RemoveRange(int index, int count) => RemoveItemsRange(index, count);

    // Will allow to replace a range with fewer, equal, or more items.
    // Raises CollectionChanged (NotifyCollectionChangedAction.Replace)
    public void ReplaceRange(int index, int count, IEnumerable<T> collection)
    {
         RemoveItemsRange(index, count);
         InsertItemsRange(index, collection);
    }

    #region virtual methods
    protected virtual void InsertItemsRange(int index, IEnumerable<T> collection);
    protected virtual void RemoveItemsRange(int index, int count);
    #endregion

Please see the linked issue for the full discussion.

I'm assuming it would land here and the appropriate shims would be created, however I don't know enough about netstandard to actually draw up the PR.

[jamesmontemagno]

I'm so into this! @terrajobst please please please please

[ahoefling]

I just created an issue on the mono project so we get it added there as well. https://github.com/mono/mono/issues/13265

[terrajobst]

If this makes it into. NET Core soon, we can add it here.

[ahoefling]

@terrajobst the .NET Core PR dotnet/corefx#35772 has been merged which was the last remaining outstanding work to get this feature into .NET Core.

What do we need to do to get this into .NET Strandard

[terrajobst]

What do we need to do to get this into .NET Strandard

Nothing. I just submitted the PR. Members are by default included in the next version of the standard.

[ahoefling]

Such great news! Thanks @terrajobst