I have a problem with my linq query. I get a null reference exception. What's wrong with my code? I do null checks but still get an exception.
What am I doing wrong?
Math.Round(invoiceData?.Lines?.Sum(x => x.Amount) ?? 0, 2);
Thanks in advance.
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mrjasmin
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1I don't see how this is a duplicate? I know what an nullReferenceException is. – mrjasmin Dec 29 '16 at 08:44
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1What if `Amount` is null? Try use `.Sum(v => (decimal?) v.Amount) ?? 0)` – M. Wiśnicki Dec 29 '16 at 08:49
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Have you tried to do like:
Math.Round(invoiceData?.Lines?.Sum(x => x.Amount ?? 0), 2);
federico scamuzzi
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Hi! That won't work. Amount is a decimal and you can't use the null coalescing operator there. – mrjasmin Dec 29 '16 at 08:48
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1ah ok ... so maybe try something like: Math.Round(invoiceData?.Lines?.Where(item=>item!=null && item.Amount != null).Sum(x => x.Amount) ?? 0, 2); – federico scamuzzi Dec 29 '16 at 08:51