Pseudocode for a simple search model without requiring crazy hibernate style "ICriteria" objects

class SomeController {

	public override void Process() {
		var search = new UserSearch();
		search.firstName = htmlForm.get("firstName");
		search.lastName = htmlForm.get("lastName");
		var renderable = prepareToRender(search.getResults());
		// render view.
	}

	public IList<IDictionary<string, string>> preparetoRender(IList<User> searchResults) {
		// Map users to dictionary of strings
	}
}


class UserSearch {
	public string firstName;
	public string lastName;

	enum SearchCriteria {
		FIRST_NAME = 0x01,
		LAST_NAME = 0x02
	}
	
	public IList<User> getResults() {
		IDictionary<int, FinderDelegate> finders = new DickedInAiry<int, FinderDelegate>();
		finder[1] = delegate { repository.findByFirstName(firstName) }
		finder[2] = delegate { repository.findByLastName(lastName) }
		finder[3] = delegate { repository.findByBoth(firstName, lastName) }

    	        int selector = (firstName != null ? FIRST_NAME : 0) |
                               (lastName != null ? LAST_NAME : 0);

		if(finder.ContainsKey(selector)) {
	                return finder[selector]();
		} else {
			throw new ApplicationException("You can't search that way");
		}
  }

}