StreamReader vs StreamWrite

[KenLee]

help!!
I used StreamReader and StreamWrite.
the problem is it doesn't write all readline.
For example it read 100 line and write 51lines.
this is codes.

class kenlee{
private StreamWriter sw ;
private StreamReader sr;
private String line;
private String SSNO;
private const int SSNO_F = 13, SSNO_L = 21;
private void btnload_Click(o bject sender, EventArgs e)
{
read();

}

void read()
{

try
{
// Create an instance of StreamReader to read from a file.
// The using statement also closes the StreamReader.
using (StreamReader SR = new StreamReader(te xtBox1.Text))
{
Int32 count=0;
SW = new StreamWriter("T estFile.txt");
while ((line = SR.ReadLine()) != null)
{
SSNO=line.Subst ring(SSNO_F, SSNO_L);
count += 1;
sw.WriteLine("S SNO is : {0}", SSNO);
}


}
////omited

}

[Mark R. Dawson]

RE: StreamReader vs StreamWrite

Hi KenLee,
you want to make sure you close your streams properly, then you will see
all the data being written to the file, otherwise it may not have flushed all
data from its underlying buffer into the file. Make sure you explicitly call
the Close method on the StreamWriter inside a finally statement and you will
be in good shape.


Hope that helps
Mark Dawson

http://www.markdawson.org

"KenLee" wrote:
[color=blue]
> help!!
> I used StreamReader and StreamWrite.
> the problem is it doesn't write all readline.
> For example it read 100 line and write 51lines.
> this is codes.
>
> class kenlee{
> private StreamWriter sw ;
> private StreamReader sr;
> private String line;
> private String SSNO;
> private const int SSNO_F = 13, SSNO_L = 21;
> private void btnload_Click(o bject sender, EventArgs e)
> {
> read();
>
> }
>
> void read()
> {
>
> try
> {
> // Create an instance of StreamReader to read from a file.
> // The using statement also closes the StreamReader.
> using (StreamReader SR = new StreamReader(te xtBox1.Text))
> {
> Int32 count=0;
> SW = new StreamWriter("T estFile.txt");
> while ((line = SR.ReadLine()) != null)
> {
> SSNO=line.Subst ring(SSNO_F, SSNO_L);
> count += 1;
> sw.WriteLine("S SNO is : {0}", SSNO);
> }
>
>
> }
> ////omited
>
> }[/color]

[Jon Skeet [C# MVP]]

RE: StreamReader vs StreamWrite

Mark R. Dawson <MarkRDawson@di scussions.micro soft.com> wrote:[color=blue]
> you want to make sure you close your streams properly, then you will see
> all the data being written to the file, otherwise it may not have flushed all
> data from its underlying buffer into the file. Make sure you explicitly call
> the Close method on the StreamWriter inside a finally statement and you will
> be in good shape.[/color]

Or (preferrably IMO) use "using" a statement around the StreamWriter.

--
Jon Skeet - <skeet@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[Mark R. Dawson]

RE: StreamReader vs StreamWrite

Hi John,
I would most definitely recommend that too, but is the IDisposable
interface implemented explicitly on the StreamWriter class I do not see it as
a public method?

Mark.

"Jon Skeet [C# MVP]" wrote:
[color=blue]
> Mark R. Dawson <MarkRDawson@di scussions.micro soft.com> wrote:[color=green]
> > you want to make sure you close your streams properly, then you will see
> > all the data being written to the file, otherwise it may not have flushed all
> > data from its underlying buffer into the file. Make sure you explicitly call
> > the Close method on the StreamWriter inside a finally statement and you will
> > be in good shape.[/color]
>
> Or (preferrably IMO) use "using" a statement around the StreamWriter.
>
> --
> Jon Skeet - <skeet@pobox.co m>
> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
> If replying to the group, please do not mail me too
>[/color]

[Jon Skeet [C# MVP]]

RE: StreamReader vs StreamWrite

Mark R. Dawson <MarkRDawson@di scussions.micro soft.com> wrote:[color=blue]
> I would most definitely recommend that too, but is the IDisposable
> interface implemented explicitly on the StreamWriter class I do not see it as
> a public method?[/color]

Yes, it's done with explicit implementation - TextWriter itself has
IDisposable.Dis pose.

--
Jon Skeet - <skeet@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too