Question

In my project, I have:
Form1, <– this is the main form, run in main thread
Form2, <– this is the subform
1 background worker

experienced problem:
when I create a new form inside background worker, and show it using

Form2 test = new Form2(); *test.show();*

the form shows up, but freezed and I can do nothing to the form

the question is:
1. is it able to create a form inside a background worker but, the form will run on the main thread?
2. if yes, how to do it? 🙂
3. if not, how to control a form that, I declared on the main thread, from backgroundworker

Answer 1

You should use Control.Invoke to create new Form’s .

public static class InvokeControl
    {
        public static void InvokeIfRequired(this Control c, Action<Control> action)
        {
            if (c.InvokeRequired)
            {
                c.Invoke(new Action(() => action(c)));
            }
            else
            {
                action(c);
            }
        }
    }

and class this method by

InvokeControl.InvokeIfRequired(this, c => {//Create you're form here});