c# - Delete a Temp File after FileStream Pop-Up response -

i use interop saveas(d:/temp) template excel sheet after changes made. use filestream send user pop-up save file. file in d:\temp still exists. there way delete file on pop-up response?

//save excel file saveexcelfile(exportpath, sourcefile, excelworkbook,                 excelapllication, excelworksheet);  #region pop , file open if (system.io.file.exists(sourcefile)) {     filestream fssource =          new filestream(sourcefile, filemode.open, fileaccess.read);      return file(fssource, "application/vnd.ms-excel", "filename" + .xls"); } else {     return view(); } #endregion 

instead of creating temp file, loading stream, , trying delete it, suggest create file directly in memory stream (i.e. system.io.memorystream) in first place, don't have load , delete it.

if cannot create directly in memory stream, main issue cannot delete temp file while you're using in filestream. in case, copy filestream memorystream, close , dispose filestream, delete temp file, , return memorystream user.

you can use function bellow copy streams correctly.

// author: racil hilan. /// <summary>copies data source stream target stream.</summary> private static void copystream(stream sourcestream, stream targetstream) {   const int buffer_size = 4096;   byte[] buffer = new byte[buffer_size];   //reset source stream in order process data.   if (sourcestream.canseek)     sourcestream.position = 0;   //copy data source stream target stream.   int bytesread = 0;   while ((bytesread = sourcestream.read(buffer, 0, buffer_size)) > 0)     targetstream.write(buffer, 0, bytesread);   //reset source stream , target stream make them ready other operation.   if (sourcestream.canseek)     sourcestream.position = 0;   if (targetstream.canseek)     targetstream.position = 0; }