How to add another condition to an expression?

Question

I have an expression like this:

Expression<Func<int, bool>> exp = i => i<15 && i>10;

I want to add a condition to exp after this line. How can I do this?

Answer 1

Simply with this:

Expression<Func<int, bool>> exp = i => i < 15 && i > 10;
var compiled = exp.Compile();
exp = i => compiled(i) && i % 2 == 0;  //example additional condition

Note that you can't do it like this:

exp = i => exp.Compile()(i) && i % 2 == 0; //example additional condition

because exp will be added to the closure by reference and as a result, calling it will cause a StackOverflowException.