NetworkServiceWaitAndRetry.cs

internal async Task<T> WaitAndRetryInner<T>(Func<Task<T>> func, Func<int, TimeSpan> sleepDurationProvider,
                                            int retryCount,
                                            Func<Exception, TimeSpan, Task> onRetryAsync)
{   
    return await Policy
                  .Handle<Exception>()
                  .WaitAndRetryAsync(retryCount, sleepDurationProvider, onRetryAsync)
                  .ExecuteAsync<T>(func);
}