retry.cs

/*
https://stackoverflow.com/questions/1563191/cleanest-way-to-write-retry-logic/1563234?fbclid=IwAR1xkK60U07JQP8NZ0h61mWuF21AOWEfGXLrDs94PuvLI0xo7HMkdsWSQcs#1563234

Usage:
Retry.Do(() => SomeFunctionThatCanFail(), TimeSpan.FromSeconds(1));
Or
Retry.Do(SomeFunctionThatCanFail, TimeSpan.FromSeconds(1));
Or
int result = Retry.Do(SomeFunctionWhichReturnsInt, TimeSpan.FromSeconds(1), 4);
*/

public static class Retry
{
    public static void Do(
        Action action,
        TimeSpan retryInterval,
        int maxAttemptCount = 3)
    {
        Do<object>(() =>
        {
            action();
            return null;
        }, retryInterval, maxAttemptCount);
    }

    public static T Do<T>(
        Func<T> action,
        TimeSpan retryInterval,
        int maxAttemptCount = 3)
    {
        var exceptions = new List<Exception>();

        for (int attempted = 0; attempted < maxAttemptCount; attempted++)
        {
            try
            {
                if (attempted > 0)
                {
                    Thread.Sleep(retryInterval);
                }
                return action();
            }
            catch (Exception ex)
            {
                exceptions.Add(ex);
            }
        }
        throw new AggregateException(exceptions);
    }
}