How do I determine visibility of a control?

Question

I have a TabControl that contains several tabs. Each tab has one UserControl on it. I would like to check the visibility of a control x on UserControl

Answer 1

Unfortunately the control doesn't provide anything public that will allow you to check this.

One possibility would be to set something in the controls 'Tag' property. The tag’s purpose is to associate user data with the control. So it can be anything not just a boolean.

Here is the Tag property doc

If you really want the brute force way, you can use Reflection, basically calling GetState(2):

public static bool WouldBeVisible(Control ctl) 
{
      // Returns true if the control would be visible if container is visible
      MethodInfo mi = ctl.GetType().GetMethod("GetState", BindingFlags.Instance | BindingFlags.NonPublic);
      if (mi == null) return ctl.Visible;
      return (bool)(mi.Invoke(ctl, new object[] { 2 }));
}