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Is there any way (through a extention mechanism?) to get the Sum() function to allways return 0.
My workaround now is to write like this, but I’m hoping there’s a better solution?
((int?)e.CampaignCodes.Sum(f => f.Enquiries.Count()) ?? 0),
Your workaround there is a good one. Why don’t you write an extension method for IEnumerable similar to Sum called something like SumOrDefault. Then you could just reuse your extension method and you will not have to see the workaround.
Your extension method will be very simple and just use the exact code from your workaround.