Async retry helper with capped exponential backoff

using System;
using System.Threading.Tasks;

static async Task<T> RetryAsync<T>(Func<Task<T>> action, int maxTries = 5,
    int baseMs = 200, int capMs = 5000)
{
    var rnd = new Random();
    for (int attempt = 1; ; attempt++)
    {
        try { return await action(); }
        catch (Exception) when (attempt < maxTries)
        {
            double window = Math.Min(capMs, baseMs * Math.Pow(2, attempt - 1));
            await Task.Delay((int)(window / 2 + rnd.NextDouble() * window / 2));
        }
    }
}