ExponentialRetryPolicy.cs

using System;
using System.Threading.Tasks;

namespace RetryPolicies
{
    internal sealed class ExponentialRetryPolicy
    {
        public TimeSpan InitialDelay { get; set; } = TimeSpan.FromSeconds(10);

        public int NumberOfRetries{ get; set; } = 5;

        public async Task<T> OperationWithBasicRetryAsync<T>(Func<Task<T>> operation)
        {
            int currentRetry = 0;

            var delay = (int)InitialDelay.TotalMilliseconds;
            T result;

            while (true)
            {
                try
                {
                    result = await operation();

                    break;
                }
                catch
                {
                    currentRetry++;

                    if (currentRetry > NumberOfRetries)
                    {
                        throw;
                    }
                }

                await Task.Delay(delay);
                delay *= 2;
            }

            return result;
        }
    }
}