Linq to objects Predicate Builder

Question

What is the best way to do a conditional query using linq to objects(not linq to sql).

Currently I am using the Predicate builder found here http://www.albahari.com/

Answer 1

Just change PredicateBuilder to use delegates instead of expression trees and use lambdas to build the results:

public static class DelegatePredicateBuilder
{
  public static Func<T, bool> True<T>()  { return f => true;  }
  public static Func<T, bool> False<T>() { return f => false; }

  public static Func<T, bool> Or<T>(this Func<T, bool> expr1,
                                     Func<T, bool> expr2)
  {
      return t => expr1(t) || expr2(t);
  }

  public static Func<T, bool> And<T>(this Func<T, bool> expr1,
                                     Func<T, bool> expr2)
  {
      return t => expr1(t) && expr2(t);
  }
}