Code inspection: 'void' method is annotated with the [MustUseReturnValue] attribute

This inspection reports void methods annotated with [MustUseReturnValue]. That attribute only makes sense for methods that return a value. A void method has nothing for the caller to use, so the annotation does not describe any real behavior.

Example

                using JetBrains.Annotations;
                class C
                {
                    [MustUseReturnValue]
                    public void DoWork()
                    {
                    }
                }
            

                class C
                {
                    [MustUseReturnValue]
                    public bool DoWork()
                    {
                        return true;
                    }
                }
            

Quick-fix

Remove the attribute, or change the method to return a meaningful value.

01 April 2026