A Mozu extension method for ProductResource to retrieve all products from a master catalog

GetAllProducts.cs

namespace MozuExtensions
{
    public static class MozuExtensions
    {
        /// <summary>
        /// Retrieves all products from the master catalog using the tenant that was supplied when Mozu.Api.Resources.Commerce.Catalog.Admin.ProductResource was created.
        /// <para />
        /// Accepts an optional pageSize parameter -- pageSize is set to 200 by default.
        /// </summary>
        /// <param name="productResource"></param>
        /// <param name="pageSize"></param>
        /// <returns>
        /// A Task that completes to a List with members of type Mozu.Api.Contracts.ProductAdmin.Product
        /// </returns>
        public async static Task<List<Mozu.Api.Contracts.ProductAdmin.Product>> GetAllProducts(this Mozu.Api.Resources.Commerce.Catalog.Admin.ProductResource productResource, int pageSize = 200)
        {
            var productCollectionsTaskList = new List<Task<Mozu.Api.Contracts.ProductAdmin.ProductCollection>>();
            var productsList = new List<Mozu.Api.Contracts.ProductAdmin.Product>();
            var totalProductCount = 0;
            var startIndex = 0;

            var productCollection = await productResource.GetProductsAsync(pageSize: pageSize, startIndex: startIndex);
            totalProductCount = productCollection.TotalCount;
            startIndex += pageSize;
            productsList.AddRange(productCollection.Items);

            while (totalProductCount > startIndex)
            {
                productCollectionsTaskList.Add(productResource.GetProductsAsync(pageSize: pageSize, startIndex: startIndex));
                startIndex += pageSize;
            }

            while(productCollectionsTaskList.Count > 0)
            {
                var finishedTask = await Task.WhenAny(productCollectionsTaskList);
                productCollectionsTaskList.Remove(finishedTask);

                productsList.AddRange((await finishedTask).Items);
            }

            return productsList;
        }
    }
}