private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e) { webView1?.Dispose(); if (wpfHwnd == IntPtr.Zero) { WinAPIHelper.RemoveClipboardFormatListener(wpfHwnd); HotKeyManager.UnregisterHotKey(wpfHwnd, hotkeyAtom); HotKeyManager.GlobalDeleteAtom(hotkeyAtomStr); } }