Code inspection: Use 'ArgumentNullException.ThrowIfNull'

This inspection reports a manual null-check that throws ArgumentNullException and can be replaced with ArgumentNullException.ThrowIfNull(...). This makes guard clauses shorter and more idiomatic in modern C#.

Example

                if (arg == null)
                    throw new ArgumentNullException(nameof(arg));
            

ArgumentNullException.ThrowIfNull(arg);

Quick-fix

Replace the manual null-check and throw with ArgumentNullException.ThrowIfNull(...).

29 March 2026