nhibernatenhibernate-criteriacreatecriteria

Explain the difference between CreateCriteria(typeof(Cat)) and CreateCriteria<Cat>()

I've seen both formats in different examples, tutorials, blogs, etc, but for the life of me, I cannot find an explanation for the difference. What is the difference between

ICriteria crit = session.CreateCriteria(typeof(Cat));

and

ICriteria crit = session.CreateCriteria<Cat>();

When do I use one and when do I use the other?

An example of a tutorial using session.CreateCriteria(typeof(Cat)) can be found at http://nhibernate.info/doc/nh/en/index.html#quickstart

An example of a tutorial using session.CreateCriteria() can be found at http://ayende.com/blog/4023/nhibernate-queries-examples (table Blog instead of Cat)

Thanks so much!!

Solution

  • There is no difference. You can/should use the generic one if possible, and non-generic if you have access only to a Type instance (some reflection).

    The non-generic is part of NHibernate from the moment when it was imported from Java Hibernate.

    The generic was added in the Build 2.1.0.Alpha1 release.

    But because the result is non-generic ICriteria (in comparison with result of the QueryOver<T>()) it is just a syntactic sugar.