predicatebuilder – Tarik Billa

How does PredicateBuilder work

August 23, 2023 by Tarik

Let’s say you have: Expression<Func<Person, bool>> isAdult = p1 => p1.Age >= 18; // I’ve given the parameter a different name to allow you to differentiate. Expression<Func<Person, bool>> isMale = p2 => p2.Gender == “Male”; And then combine them with PredicateBuilder var isAdultMale = isAdult.And(isMale); What PredicateBuilder produces is an expression that looks like this: … Read more

C# PredicateBuilder Entities: The parameter ‘f’ was not bound in the specified LINQ to Entities query expression

April 18, 2023 by Tarik

I ran across the same error, the issue seemed to be when I had predicates made with PredicateBuilder that were in turn made up of other predicates made with PredicateBuilder e.g. (A OR B) AND (X OR Y) where one builder creates A OR B, one creates X OR Y and a third ANDs them … Read more