public void AddDown(Uri uri, StorageFile file)
        {
            Count++;
            DownLoadEntity entity = new DownLoadEntity()
            {
                Name         = Count.ToString(),
                Uri          = uri.ToString(),
                ReceiveBytes = 0
            };

            DownLoadList.Add(entity);
            DownLoadHelp.AddDownLoader(uri, file);
        }
        private async void Ini()
        {
            IReadOnlyList <DownloadOperation> items = await DownLoadHelp.GetCurrentDownLoader();

            foreach (var item in items)
            {
                Count++;
                if (DownLoadList != null)
                {
                    DownLoadEntity entity = new DownLoadEntity()
                    {
                        Name         = Count.ToString(),
                        Uri          = item.RequestedUri.ToString(),
                        ReceiveBytes = (long)item.Progress.BytesReceived
                    };
                    DownLoadList.Add(entity);
                }
            }
        }