OpenTween.MediaSelector.SelectImageServiceComboItem C# (CSharp) Метод

        private void SelectImageServiceComboItem(string svc, int? index = null)
        {
            int idx;
            if (string.IsNullOrEmpty(svc))
            {
                idx = index ?? 0;
            }
            else
            {
                idx = ImageServiceCombo.Items.IndexOf(svc);
                if (idx == -1) idx = index ?? 0;
            }

            try
            {
                ImageServiceCombo.SelectedIndex = idx;
            }
            catch (ArgumentOutOfRangeException)
            {
                ImageServiceCombo.SelectedIndex = 0;
            }

            this.UpdateAltTextPanelVisible();
        }