ObservableCollection.AddRange()

[robertmclaws]

• Introduce an AddRange function that waits until all new items are added to the collection before firing OnCollectionChanged.
• Moved a helper method out of the "Constructors" section for organizational clarity.

[dnfclas]

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[dnfclas]

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[weshaggard]

@advancedrei lets please follow the process at http://aka.ms/apireview for adding new APIs.

[robertmclaws]

Oops, sorry @weshaggard. I'll open an issue. (UPDATE: It's open).

[stephentoub]

Thanks for the contribution. Per @weshaggard's comments and the issue you opened, I'm going to close this PR until the API is agreed upon. At that point this PR or a new one can be re-opened.

[weitzhandler]

Here's a prototype that I use. It's a subclass of ObservableCollection and is an enhancement of this. I find some of the original functionality redundant, but it updates the UI fast for me. I was facing a scenario where the collection updates ~5 times per second. Reusing items was essential.

[weitzhandler]

@robertmclaws
Are you still working on it or planning to? Otherwise I'd like to take over.