ADBaseLibrary.AdobeHDS.FragmentProcessor.DoNextFragment C# (CSharp) Метод

        public async Task DoNextFragment()
        {
            try

            {
                KeyValuePair<int, int>? v = bootstrap.GetNextRead();
                if (v == null)
                    return;
                string url = string.Format(FormatFrag, baseurl, media.Url, v.Value.Key, v.Value.Value + 1, keydata, manifest.Pv20.Substring(1));
                WebStream ws = await GetStream(url);
                if (ws == null || ws.StatusCode != HttpStatusCode.OK)
                {
                    ws?.Dispose();
                    throw new IOException("Error " + ws.StatusCode + " trying to download fragment");
                }
                await ProcessFragment(ws, v.Value.Value);
                ws?.Dispose();
            }
            catch (Exception e)
            {
                int a = 1;
            }

        }