Unchecked NullReference

[DeznekCZ]

runtime/src/libraries/System.Linq/src/System/Linq/Utilities.cs

Line 71 in 78c6505

x => selector2(selector1(x));

Hi devs,
I discovered, that the linked line does not check, od result of first coverter is null.
Is there try catch on iterator or it stops execution?

[stephentoub]

what are you worried about being null?

[DeznekCZ]

In case the selector2 requires non null value.

[stephentoub]

That delegate is provided by the user. LINQ has no way of knowing whether null is a valid value or not. Any validation in that regard would need to be provided by the delegate itself, and any exception it throws would propagate out of the MoveNext call.

[DeznekCZ]

This 'it throws would propagate out of the MoveNext call' means that the element will be skipped or ends completely next execution.

[stephentoub]

May I suggest you try it and see?