public async Task <Image> GetImageAsync(string imageName, string imageResolution = null, string backgroundColour = null,
string watermarkText = null, string imageType = null)
{
if (string.IsNullOrWhiteSpace(imageName))
{
throw new ArgumentException("imageName must not be null or white space");
}
Image image;
try
{
var cacheKey = new ImageCacheKey(imageName, imageResolution, backgroundColour, watermarkText, imageType);
if ((image = await _imagesCache.GetImageAsync(cacheKey)) != null)
{
return(image);
}
if ((image = await _imageLoader.LoadFromLibraryAsync(imageName)) == null)
{
throw new ImageNotAvailableException();
}
image = _imageTransformer.ApplyTransforms(image, imageResolution, backgroundColour, watermarkText, imageType);
await _imagesCache.CacheImageAsync(cacheKey, image);
}
catch (Exception e) when(e.GetType() != typeof(ImageNotAvailableException))
{
throw new ImageLibraryException("An unexpected error occurred while retrieving the requested image.", e);
}
return(image);
}