C# extension method to copy all CosmosDB iterator items to a sequence

FeedIteratorExtensions.cs

using System.Collections.Generic;
using System.Threading.Tasks;
using Microsoft.Azure.Cosmos;

public static class FeedIteratorExtensions
{
    public static async Task<IEnumerable<T>> ReadAllAsync<T>(this FeedIterator<T> iterator)
    {
        var result = new List<T>();
        while (iterator.HasMoreResults) {
            result.AddRange(await iterator.ReadNextAsync());
        }
        return result;
    }
}