public async Task <ReadOnlyCollection <Category> > GetSubcategoriesAsync(int parentId, int maxAmountOfProducts)
{
string cacheFileName = String.Format("Categories-{0}-{1}", parentId, maxAmountOfProducts);
try
{
// Case 1: Retrieve the items from the cache
return(await _cacheService.GetDataAsync <ReadOnlyCollection <Category> >(cacheFileName));
}
catch (FileNotFoundException)
{ }
// Retrieve the items from the service
var categories = await _productCatalogService.GetCategoriesAsync(parentId, maxAmountOfProducts);
// Save the items in the cache
await _cacheService.SaveDataAsync(cacheFileName, categories);
return(categories);
}
