Code inspection: Move variable declaration inside loop condition

This inspection reports a variable declaration placed outside a loop even though it is only used for an assignment inside the loop condition. The quick-fix rewrites assignment-based null checks into pattern-based declarations directly in the loop condition.

Example

                object o;
                while ((o = NextObject()) != null)
                {
                    Console.WriteLine(o);
                }
            

                while (NextObject() is { } o)
                {
                    Console.WriteLine(o);
                }
            

Quick-fix

Move the declaration into the loop condition and use a pattern declaration there.

30 March 2026