c# - How to combine (OR) two expression trees

Question

I have two expression trees of type : Expression<Func<string, bool>> and I would like to obtain a single Expression that will do the OR of the two expressions (passing the same string parameter to both expressions) Any idea?

Answer 1

You can use PredicateBuilder from LINQKit to do this. For example:

Expression<Func<string, bool>> e1 = …;
Expression<Func<string, bool>> e2 = …;
Expression<Func<string, bool>> combined = e1.Or(e2).Expand();