Combining Predicates in post .Net 2.0

Question

What is the way of combining predicates like we used do for Expression.AndAlso

I have a predicate

Predicate<Foo> predicate = p1 => (p1.IsActive) && p1.Type != "BR";

and

Predicate<Foo> datePredicate = p1 => (p1.Year) == DateTime.Now.Year;

Based on some condition I want to combine both so that resultant predicate can be passed to a method which accepts single predicate parameter.

predicate = predicate.????(datePredicate);

so what is the way to do it?

You can also take a look at LinqKit (you will need to reference it). Scroll to combining expressions: http://www.albahari.com/nutshell/linqkit.aspx — mortb, Nov 14 '16 at 08:44
Predicate datePredicateAnd = p =>(predicate(p) && datePredicate(p)) — Damith, Nov 14 '16 at 08:44
@MatthewWatson: I have seen that and its for .Net 2.0 when predicate class was not there. — Nikhil Agrawal, Nov 14 '16 at 08:45

score 1 · Accepted Answer · answered Nov 14 '16 at 08:49

1

You can combine predicates as below

Predicate<Foo> datePredicateAnd = p =>(predicate(p) && datePredicate(p));

answered Nov 14 '16 at 08:49

Damith

1

Even though this will also work `predicate = p => predicate(p) && datePredicate(p);` but this will cause StackOverflow Exception as it will try to call itself resulting in StackOverflow. A perfect example of `Access to modified Closure.` – Nikhil Agrawal Nov 14 '16 at 09:19

1 Answers1