c# - BackgroundTransfer cannot move files -


i having problem downloading files using background transfer. after completion of download when moving file, gives exception operation not permitted

void addtransferrequest(string filename) {      if (string.isnullorempty(filename))            return;      string filepathtodownload = string.empty;      filepathtodownload = activereciter.downloadurl;      filepathtodownload += filename;       uri transferuri = new uri(uri.escapeuristring(filepathtodownload),                                 urikind.relativeorabsolute);      backgroundtransferrequest transferrequest = new       backgroundtransferrequest(transferuri);      transferrequest.method = "get";      transferrequest.transferpreferences = transferpreferences.allowbattery;       uri downloaduri = new uri(datasource.tempdownloadlocation + filename,                                 urikind.relativeorabsolute);      transferrequest.downloadlocation = downloaduri;      transferrequest.tag = filename;       transferrequest.transferstatuschanged +=         new eventhandler<backgroundtransfereventargs>                                               (transfer_transferstatuschanged);      transferrequest.transferprogresschanged += new       eventhandler<backgroundtransfereventargs>(transfer_transferprogresschanged);       try      {        backgroundtransferservice.add(transferrequest);        chapterfilenames.dequeue();      }      catch (invalidoperationexception)      {      }      catch (exception)      {      } } void transfer_transferstatuschanged(object sender, backgroundtransfereventargs e) {    processtransfer(e.request); } void transfer_transferprogresschanged(object sender, backgroundtransfereventargs e) { } private void processtransfer(backgroundtransferrequest transfer) {     switch (transfer.transferstatus)     {        case transferstatus.completed:        if (transfer.statuscode == 200 || transfer.statuscode == 206)        {              using (isolatedstoragefile isostore =                      isolatedstoragefile.getuserstoreforapplication())                  {                    try                    {                       string filename = transfer.tag;                       string folderpath = string.format(@"{0}{1}\{2}\",                          datasource.downloadlocation, activereciter.reciterid, chapter.chapterid);                       string filefullpath = folderpath + filename;                        if (!isostore.directoryexists(path.getdirectoryname(folderpath)))                           isostore.createdirectory(path.getdirectoryname(folderpath));                        if (isostore.fileexists(filefullpath))                           isostore.deletefile(filefullpath);                        isostore.movefile(transfer.downloadlocation.originalstring, filefullpath);                        //excpetion thrown here                       removetransferrequest(transfer.requestid);                 }                 catch (exception ex)                 {                 messagebox.show("error occured: " + ex.message + transfer.tag, "error",                                   messageboxbutton.ok);                 return;                 }             }         }         break;     } }

when moving file, throws exception, don't know wrong moving (this happens on of files not files).

from msdn page, under file system restrictions section:

you can create additional directory structure choose underneath root “/shared/transfers” directory, , can copy or move files after transfer complete ensure background transfer service not modify files, attempting initiate transfer using path outside of “/shared/transfers” directory throw exception.

make sure not trying move file outside /shared/transfers folder.


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