Code inspection: Part of foreach loop can be converted into LINQ-expression but another 'GetEnumerator' method will be used

This inspection reports a foreach loop whose body can only be partly converted into a LINQ-style sequence operation, and doing so will use a different GetEnumerator method than the original loop. This warning is more conservative than the full loop-to-query conversion warning because only part of the loop can be rewritten.

Example

                foreach (var item in source)
                {
                    if (item.IsVisible)
                        yield return item;
                    Log(item);
                }
            

                foreach (var item in source.Where(item => item.IsVisible))
                {
                    yield return item;
                    Log(item);
                }
            

Quick-fix

Convert the convertible part of the loop body into a query operation while keeping the rest of the loop explicit.

30 March 2026