NHibernate detached OrderBy

Question

I am using a repository pattern to wrap NHibernate entities. One of the methods is public IList<T> GetAll() which simply returns all items of that entity. The implementation is done in either Criteria or QueryOver.

I would like to overload this method to accept a sorting order, something like this: public IList<T> GetAll(NHOrderFor<T> order) which I could call and fluently define the order for. Is this possible? QueryOver is preferred but not required.

Update

I got a little further ahead. I defined the parameter as Expression<Func<T,object>> path which is what's expected by QueryOver.OrderBy() but the expression is missing the .Asc or .Desc specification that's required to follow.

Answer 1

You can pass in a bool variable to determine if it's asc or desc - the only "tricky" part is that the .Asc and .Desc are properties, so you have to assign them to a result (you don't need to do anything with the result tho - it just returns the same queryover), eg:

public IList<T> GetAll(Expression<Func<T,object>> path, bool ascending) {
    if (ascending)
        queryOver = queryOver.OrderBy(path).Asc;
    else
        queryOver = queryOver.OrderBy(path).Desc;
    return queryOver.List<T>();
}