gistfile1.cs

private void ProcessTransfer(BackgroundTransferRequest transfer)
        {
            switch (transfer.TransferStatus)
            {
                case TransferStatus.Completed:

                    // If the status code of a completed transfer is 200 or 206, the
                    // transfer was successful
                    if (transfer.StatusCode == 200 || transfer.StatusCode == 206)
                    {
                        //傳輸成功則移除request
                        RemoveTransferRequest(transfer.RequestId);

                        // 在此範例下載的檔案放在root隔離儲存區目錄下
                        using (IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForApplication())
                        {
                            //取得使用者範圍內的隔離儲存區
                            string filename = transfer.Tag;
                            if (isoStore.FileExists(filename))
                            {
                                isoStore.DeleteFile(filename);//若已存在手動刪除下載的檔案
                            }
                            isoStore.MoveFile(transfer.DownloadLocation.OriginalString, filename);
                        }
                    }
                    else
                    {
                        //處理傳輸失敗。
                        RemoveTransferRequest(transfer.RequestId);

                        if (transfer.TransferError != null)
                        {
                            MessageBox.Show("傳輸失敗");
                        }
                    }
                    break;


                case TransferStatus.WaitingForExternalPower:
                    WaitingForExternalPower = true;
                    break;

                case TransferStatus.WaitingForExternalPowerDueToBatterySaverMode:
                    WaitingForExternalPowerDueToBatterySaverMode = true;
                    break;

                case TransferStatus.WaitingForNonVoiceBlockingNetwork:
                    WaitingForNonVoiceBlockingNetwork = true;
                    break;

                case TransferStatus.WaitingForWiFi:
                    WaitingForWiFi = true;
                    break;
            }
        }