A simple caller without allowing consumers to handle exceptions

ServiceCallerHelperWithoutExtension.cs

    public class ServiceCallHelper
    {
        public TResult CallWithRetry<TResult>(Func<TResult> realCall, bool retry = true)
        {
            try
            {
                return realCall();
            }
            catch (TimeoutException)
            {
                if (retry)
                    return Retry(realCall);
                throw;
            }
        }

        private TResult Retry<TResult>(Func<TResult> realCall)
        {
            return realCall();
        }
    }