omit blank lines in file using StreamReader

[=?Utf-8?B?TWFuanJlZSBHYXJn?=]

Hi,


I am using StreamReader to read an ASCII file that contains blank lines.
How can I omit reading blank lines? I tried somting like...


FileStream inFile = new FileStream("c:\ HTAC10A.PRN",Fi leMode.Open);
StreamReader inreader = new StreamReader(in File);
string line = inreader.ReadLi ne();
if(line.Trim() != line.Empty)


but it did not work.

Any suggestions will be appriciated.

[Rob Levine]

Re: omit blank lines in file using StreamReader

15/04/2008 11:19:47
Manjree Garg <garg@newsgroup .nospamwrote in message
<CEB79234-3951-4A1C-B15B-6087F00748DF@mi crosoft.com>

Hi,
>
>
I am using StreamReader to read an ASCII file that contains

blank lines.

How can I omit reading blank lines? I tried somting like...
>
>
FileStream inFile = new FileStream("c:\ HTAC10A.PRN",Fi leMode.Open);
StreamReader inreader = new StreamReader(in File);
string line = inreader.ReadLi ne();
if(line.Trim() != line.Empty)
>
>
but it did not work.
>
Any suggestions will be appriciated.

try
if(line.Trim(). Length 0)
As a quick aside, make sure that you close the FileStream and
StreamReader correctly, even in the event of an exception being
raised.

--
Rob Levine

http://blog.roblevine.co.uk/

rob@rob123levin e.removenumbers andme.co.uk

[Marc Gravell]

Re: omit blank lines in file using StreamReader

That approach should (typos aside) work fine; see below - to make the
calling code simpler, I've moved the code that worries about reading
just non-empty lines into a separate method (using an "interator
block"):

static void Main()
{
foreach (string line in ReadNonEmptyLin es(@"c:\foo.txt "))
{
Console.WriteLi ne(line);
}
}

static IEnumerable<str ingReadNonEmpty Lines(string path)
{
using (TextReader reader = File.OpenText(p ath))
{
string line;
while ((line = reader.ReadLine ()) != null) // EOF
{
line = line.Trim();
if (line != "")
{ // oinly report non-empty lines
yield return line;
}
}
}
}

[Marc Gravell]

Re: omit blank lines in file using StreamReader

"interator block"
stupid fingers... iterator block

[=?Utf-8?B?TWFuanJlZSBHYXJn?=]

Re: omit blank lines in file using StreamReader

Hi Marc,

Thanks for the suggestion. It is working with the text file that I
created by myself containing blak lines. But I have got Raman spectroscopy
data files that contain a blank line at the end and it shows an arrow (->) in
that line when I open it in word pad. It does not work with those files???


cheers.

Manjree
"Marc Gravell" wrote:

That approach should (typos aside) work fine; see below - to make the
calling code simpler, I've moved the code that worries about reading
just non-empty lines into a separate method (using an "interator
block"):
>
static void Main()
{
foreach (string line in ReadNonEmptyLin es(@"c:\foo.txt "))
{
Console.WriteLi ne(line);
}
}
>
static IEnumerable<str ingReadNonEmpty Lines(string path)
{
using (TextReader reader = File.OpenText(p ath))
{
string line;
while ((line = reader.ReadLine ()) != null) // EOF
{
line = line.Trim();
if (line != "")
{ // oinly report non-empty lines
yield return line;
}
}
}
}
>

[Jon Skeet [C# MVP]]

Re: omit blank lines in file using StreamReader

On Apr 15, 4:05 am, Manjree Garg <g...@newsgroup .nospamwrote:

   Thanks for the suggestion. It is working with the text file that I
created by myself containing blak lines. But I have got Raman spectroscopy
data files that contain a blank line at the end and it shows an arrow (->)in
that line when I open it in word pad. It does not work with those files???

Look at the file in a hex editor - they've probably got some odd line
ending.

Jon

[Jon Skeet [C# MVP]]

Re: omit blank lines in file using StreamReader

On Apr 15, 3:34 am, Marc Gravell <marc.grav...@g mail.comwrote:

"interator block"

>
stupid fingers... iterator block

On the other hand that would be a cool alias for an iterator block
returning IEnumerable<int >.

Jon

[Jeffrey Tan[MSFT]]

Re: omit blank lines in file using StreamReader

Hi Manjree,

Yes, I agree with Jon that that line may not be empty. There may be
invisible or non-Ascii characters in that line which are shown as "??" in
text editor. Using a binary hex editor such as Visual Studio will give you
the actual encoding of that line.

Thanks.

Best regards,
Jeffrey Tan
Microsoft Online Community Support

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