public string GetResponsiveImageUrl(string url, double aspect, string widthFactor, int containerSize = 0)
        {
            string result = string.Format("{0}_a{1}_w{2}_cs{3}", url, aspect, widthFactor, containerSize);
            ResponsiveImageRequest responsiveImageRequest = new ResponsiveImageRequest
            {
                Url = url,
                Aspect = aspect,
                WidthFactor = widthFactor,
                ContainerSize = containerSize,
                ResponsiveImageUrl = result
            };
            _responsiveImageRequests.Add(responsiveImageRequest);

            return result;
        }
        public string GetResponsiveImageUrl(string url, double aspect, string widthFactor, int containerSize = 0)
        {
            string result = string.Format("{0}_a{1}_w{2}_cs{3}", url, aspect, widthFactor, containerSize);
            ResponsiveImageRequest responsiveImageRequest = new ResponsiveImageRequest
            {
                Url                = url,
                Aspect             = aspect,
                WidthFactor        = widthFactor,
                ContainerSize      = containerSize,
                ResponsiveImageUrl = result
            };

            _responsiveImageRequests.Add(responsiveImageRequest);

            return(result);
        }