How to check if animation is active in if?

Question

C++ / C#

If so, it throws an error...

if (Input.GetButton ("Jump") && grounded) {
      if (!animator.SetBool("IsJumping")) {
        animator.SetBool("IsJumping", true);
      }
    }
    if (grounded){
      animator.SetBool("IsJumping", false);
    }

Answer 1

and take not Bool, but a trigger.
animator.SetTrigger
resets itself after navigating it.
affixed -> the animator has moved on the trigger and will reset it.