Demonstrates How An Exponential Back-Off Works

ExponentialBackoff.cs

using System;
using System.Collections.Generic;

public class Program
{
    private static int _highInterval;
    private static int _lowInterval;
    private static int _maxInterval;
    private static int _minInterval;
    private static int _retryLimit;

    public static void Main()
    {
        _retryLimit = 10;
        _minInterval = TimeSpan.Zero.Milliseconds;
        _maxInterval = (int)TimeSpan.FromSeconds(30).TotalMilliseconds;
        var intervalDelta = (int)TimeSpan.FromMilliseconds(50).TotalMilliseconds;

        _lowInterval = (int)(intervalDelta * 0.8);
        _highInterval = (int)(intervalDelta * 1.2);

        Console.WriteLine($"Exponential (limit {_retryLimit}, min {_minInterval}ms, max {_maxInterval}ms, min delta {_lowInterval}ms, max delta {_highInterval}ms");

        var intervals = GetIntervals();

        foreach (var i in intervals )
        {
            Console.WriteLine(i);
        }
    }

    private static IEnumerable<TimeSpan> GetIntervals()
    {
        var random = GetRandom();

        for (var i = 0; _retryLimit == int.MaxValue || i < _retryLimit; i++)
        {
            var delta = (int)Math.Min(_minInterval + Math.Pow(2, i) * random.Next(_lowInterval, _highInterval), _maxInterval);

            yield return TimeSpan.FromMilliseconds(delta);
        }
    }
    
    private static Random GetRandom()
    {
        var seed = new Random();
        return new Random(seed.Next(int.MinValue,int.MaxValue));
    }
}