public class RetryDecorator : IService
{
    private readonly IService _inner;
    private readonly int _max;
    public RetryDecorator(IService inner, int max = 3) => (_inner, _max) = (inner, max);
    public bool Execute()
    {
        for (int i = 0; i < _max; i++)
            if (_inner.Execute()) return true;
        return false;
    }
}