Know Your Cloud Resource Costs on Azure

GetResourceGroupCostsAsync.cs

public async Task<IEnumerable<ResourceGroupCost>> GetResourceGroupCostsAsync(
    Subscription subscription,
    DateTime dateStart,
    DateTime dateEnd,
    string authToken)
{
    var costs = await GetResourceCostsAsync(subscription.SubscriptionId, dateStart, dateEnd, authToken).ConfigureAwait(false);

    var grouped = costs.GroupBy(
                                p => new
                                         {
                                             DateStart = p.UsageValue.Properties.UsageStartTime,
                                             DateEnd = p.UsageValue.Properties.UsageEndTime,
                                             ResourceGroupName = ResourceGroupDateKey.GetResourceGroupKey(p)
                                         })
                       .Select(
                               p => new ResourceGroupCost()
                                        {
                                            ResourceGroupName = p.Key.ResourceGroupName,
                                            DateStart = DateTimeOffset.Parse(p.Key.DateStart),
                                            DateEnd = DateTimeOffset.Parse(p.Key.DateEnd),
                                            Cost = p.Sum(q => q.CalculatedCosts)
                                        })
                       .OrderBy(p => p.ResourceGroupName)
                       .ThenBy(p => p.DateStart)
                       .ThenBy(p => p.DateEnd);

    return grouped;
}