Unable to cast object of type 'NHibernate.Hql.Ast.HqlCast' to type 'NHibernate.Hql.Ast.HqlBooleanExpression?

Most probably you miss Expression over your datetime dateTimeSelector predicate.

Tried to comment all: . OrderBy(dateTimeSelector) . Skip(startIndex - 1) .

Take(count), and it didn't help – user1065869 Dec 3 '11 at 15:18 how your example call looks like? – Wiktor Zychla Dec 3 '11 at 15:42 The problem was that I wrote short condition in the expression: as ((a == null)? True : a > b) NH casting fails on that (?) – user1065869 Dec 3 '11 at 15:53 Probably.

Try something trivial like a > be and it should work. When it fails at specific conditions (like yours) it means that there's no obvious translation of the expression to SQL (hibernate linq is not able to handle it). – Wiktor Zychla Dec 3 '11 at 16:13.

True : a > b) NH casting fails on that (?).

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