BackgroundProcesses.SpineClass.GetPhoneLinesAsync C# (CSharp) Méthode

        private async Task<Dictionary<Guid, PhoneLine>> GetPhoneLinesAsync()
        {
            PhoneCallStore store = await PhoneCallManager.RequestStoreAsync();

            // Start the PhoneLineWatcher
            var watcher = store.RequestLineWatcher();
            var phoneLines = new List<PhoneLine>();
            var lineEnumerationCompletion = new TaskCompletionSource<bool>();
            watcher.LineAdded += async (o, args) =>
            {
                var line = await PhoneLine.FromIdAsync(args.LineId);
                phoneLines.Add(line);
            };
            watcher.Stopped += (o, args) => lineEnumerationCompletion.TrySetResult(false);
            watcher.EnumerationCompleted += (o, args) => lineEnumerationCompletion.TrySetResult(true);
            watcher.Start();

            // Wait for enumeration completion
            if (!await lineEnumerationCompletion.Task)
            {
                throw new Exception("Phone Line Enumeration failed");
            }

            watcher.Stop();

            Dictionary<Guid, PhoneLine> returnedLines = new Dictionary<Guid, PhoneLine>();

            foreach (PhoneLine phoneLine in phoneLines)
            {
                if (phoneLine != null && phoneLine.Transport == PhoneLineTransport.Cellular)
                {
                    returnedLines.Add(phoneLine.Id, phoneLine);
                }
            }

            return returnedLines;

        }