private static T ThrowValueNotPossible <T>([NotNull] Directory directory, int tagType)
{
var o = directory.GetObject(tagType);
if (o == null)
{
throw new MetadataException($"No value exists for tag {directory.GetTagName(tagType)}.");
}
throw new MetadataException($"Tag {tagType} cannot be converted to {typeof(T).Name}. It is of type {o.GetType()} with value: {o}");
}