Retry Utility

RetryUtility.cs

public class RetryUtility
{
	public void Do(Action action, int retryInterval = 100, int maxAttemptCount = 3)
	{
		Do<object>(() =>
		{
			action();
			return null;
		}, retryInterval, maxAttemptCount);
	}

	public T Do<T>(Func<T> action, int retryInterval = 100, 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);
	}

	public async Task DoAsync(Action action, int retryInterval = 100, int maxAttemptCount = 3)
	{
		await DoAsync<object>(() =>
		{
			action();
			return null;
		}, retryInterval, maxAttemptCount);
	}

	public async Task<T> DoAsync<T>(Func<Task<T>> action, int retryInterval = 100, int maxAttemptCount = 3)
	{
		var exceptions = new List<Exception>();

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

Usage (using LinqPad):

`
try
{
RetryUtility.Do(() =>
{
var result = DateTime.Now.Ticks % 2;

		if (result == 1)
			throw new InvalidOperationException();

		result.Dump();
	});
}
catch (AggregateException ex)
{
	foreach (var exception in ex.InnerExceptions)
	{
		exception.Message.Dump();			
	}	
}

try
{
	var retryResult = RetryUtility.Do<long>(() =>
	{
		var result = DateTime.Now.Ticks % 2;

		if (result == 1)
			throw new InvalidOperationException();

		return result;
	});

	retryResult.Dump();
}
catch (AggregateException ex)
{
	foreach (var exception in ex.InnerExceptions)
	{
		exception.Message.Dump();
	}
}

`