CODEWITHSUNDEEP
c#async-await
Hakim Marley
Hakim Marley

Reputation: 331

Await for a process to finish execution

I have a process that takes some varying time to execute. The proceeding part of the code depends on its results. The process creates a printable file (PRN) file. The proceeding section then reads that file and returns its bytes contents.

When i put a breakpoint at the using statement, i get to read the bytes of the created file and return them to where they are being requested. But when i execute as usual, i get the error.

_ The process cannot access the file 'linkToFile' because it is being used by another process _

lbl.PrintSettings.PrinterName = printerName;
byte[] fileBytes = null;

Task.Run(() => { lbl.Print(int.Parse(qty)); }).Wait(2000); 

using (var strm = File.Open(outPutPrintFile, 
                              FileMode.Open, FileAccess.Read, FileShare.Read))
{
    using (var ms = new MemoryStream())
    {
         strm.CopyTo(ms);
         fileBytes = ms.ToArray();
    }
}

return Ok(fileBytes);

I tried to put the part that executes longer in a Task-Wait part but still getting the same error.

Upvotes: 0

Views: 84

Answers (1)

Rahul
Rahul

Reputation: 77866

Try using Fileshare.ReadWrite instead of FileShare.Read. It's not for some unknown reason as you commented but ReadWrite make sure that further Read/Write operations can be done on opening the file. From your posted code it looks to be the option to choose.

Upvotes: 2

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