BTool.FormMain.GetActiveDeviceForm C# (CSharp) Méthode

        private DeviceForm GetActiveDeviceForm()
        {
            DeviceForm deviceForm = null;
            if (InvokeRequired)
            {
                try
                {
                    Invoke((Delegate)new GetActiveDeviceFormDelegate(GetActiveDeviceForm));
                }
                catch { }
            }
            else
            {
                m_mutex.WaitOne();
                foreach (Control control in plDevice.Controls)
                {
                    if (control.GetType().BaseType == typeof(Form))
                    {
                        Form form = control as Form;
                        if (form != null && form.Visible)
                        {
                            deviceForm = (DeviceForm)form;
                            break;
                        }
                    }
                }
                m_mutex.ReleaseMutex();
            }
            return deviceForm;
        }