private static IEnumerable <string> GetAllowedExtensions(ExtensionType type)
{
var extensions = new List <string>();
if (type.HasFlag(ExtensionType.Any | ExtensionType.Empty))
{
return(null);
}
foreach (ExtensionType activeType in type.GetFlags())
{
extensions.Add('.' + activeType.ToString().ToLower());
}
return(extensions);
}