> Uzytkownik "Johnnie Walker" <tregon***@gmail.com> napisal w wiadomosci
> news:1161454973.941243.41770@k70g2000cwa.googlegroups.com...
> > Hello, I am using StreamReader.ReadLine() to read a text file.
> >
> > I need a way to move the "pointer" back to the BOF (Beginning of File)
> > without having to close the object and create a new instance.
> >
> > Is there any way of doing this? or is there another class within the
> > framework that will allow me to achieve this?
>
> If your StreamReader bases on FileStream (or another stream that has working
> property Position)you can set Position of the base stream to 0, for example:
>
>     class Test
>     {
>         public void ReadStreamManyTimes()
>         {
>             string path = @"H:\tmp\Test.txt";
>             using (FileStream fs = new FileStream(path, FileMode.Open))
>             {
>                 StreamReader reader = new StreamReader(fs);
>
>                 for (int i = 0; i < 5; i++)
>                 {
>                     ReadAllLines(reader);
>                     reader.BaseStream.Position = 0;
>                 }
>             }
>         }
>
>         private void ReadAllLines(StreamReader reader)
>         {
>             while(!reader.EndOfStream)
>             {
>                 string oneLine = reader.ReadLine();
>                 System.Console.WriteLine(oneLine);
>             }
>         }
>     }
>
>
> Best regards,
> Grzegorz

> "Johnnie Walker" <tregon***@gmail.com> wrote in message
> news:1161464571.606966.8220@h48g2000cwc.googlegroups.com...
> > Thanks a lot! very useful!
>
> I don't know if you saw my reply, but Grzegorz's reply is insufficient.  It
> does not account for the possibility of buffering within the StreamReader.
> You may use the Position property as he suggests, rather than the Seek()
> method I mentioned in my post, but in either case you need to call
> DiscardBufferedData() to ensure that when you read from the StreamReader
> after changing the position, you are actually reading from the new position.
>
> And of course it should go without saying that you should either make sure
> that you are always using a seekable stream (if you are always opening a
> disk file, this should be the case), or check the CanSeek property of the
> stream, or be prepared for a NotSupportedException being thrown.  Not all
> Streams are seekable.
>
> Pete