Simple extension with delegate

ServiceCallerHelper.cs

    public class ServiceCallHelper
    {
        /// <summary>
        /// Allow consumers to define the log exception action right before each call
        /// </summary>
        public Action<Exception> LogException { get; set; }
        public TResult CallWithRetry<TResult>(Func<TResult> realCall, bool retry = true)
        {
            try
            {
                return realCall();
            }
            catch (TimeoutException te)
            {
                Log(te);
                if (retry)
                    return Retry(realCall);
                throw;
            }
        }

        private void Log(Exception exception)
        {
            LogException?.Invoke(exception);
        }

        private TResult Retry<TResult>(Func<TResult> realCall)
        {
            try
            {
                return realCall();
            }
            catch (Exception e)
            {
                Log(e);
                throw;
            }
        }
    }