[Dev Tip] LINQ SelectMany: handle null


Using SelectMany to get a list items from multiple list then do something on that list. If result is null then we will get an exception.

solution is:

var customerAddressSelected = viewModel.PolicyHolders != null
&& viewModel.PolicyHolders
.Where(x => x.Addresses != null)
.SelectMany(x => x.Addresses)
.Any(a => a.Selected);
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