private IEnumerable<IEnumerable<string>> GetImageSets(string menuName)
{
foreach (var provider in _navigationProviders) {
if (provider.MenuName == menuName) {
var builder = new NavigationBuilder();
IEnumerable<string> imageSets = null;
try {
provider.GetNavigation(builder);
imageSets = builder.BuildImageSets();
}
catch (Exception ex) {
Logger.Error(ex, "Unexpected error while querying a navigation provider. It was ignored. The menu provided by the provider may not be complete.");
}
if (imageSets != null) {
yield return imageSets;
}
}
}
}
