Amazon.EC2.AmazonEC2Client.DescribeImages C# (CSharp) Method

        internal DescribeImagesResponse DescribeImages()
        {
            return DescribeImages(new DescribeImagesRequest());
        }
        internal DescribeImagesResponse DescribeImages(DescribeImagesRequest request)

		//this quite an expensive operation (3M of data retrieved) - so I added caching support
		public static List<Image> getImagesList(this API_AmazonEC2 amazonEC2, AmazonEC2Client ec2Client)
		{										
			if (amazonEC2.CachedImageListRequest.fileExists())
				return amazonEC2.CachedImageListRequest.load<List<Amazon.EC2.Model.Image>>(); 
				
			var describeImagesRequest = new DescribeImagesRequest(); 				
			"Retrieving ImagesList from Amazon..".info();	
			var images = ec2Client.DescribeImages(describeImagesRequest)
					  .DescribeImagesResult.Image;
			if (images.isNull() || images.size()==0)
			{
				"in getImagesList, there was an error retrieving list (are we online?)".error();				
			}
			else
			{
				amazonEC2.CachedImageListRequest = images.save();
				"The Image List was saved to : {0}".info(amazonEC2.CachedImageListRequest);  
			}
			return images;
		}