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",FileMode.Open);
StreamReader inreader = new StreamReader(inFile);
string line = inreader.ReadLine();
if(line.Trim() != line.Empty)
but it did not work.

Any suggestions will be appriciated.

[Rob Levine]

15/04/2008 11:19:47
Manjree Garg <ga**@newsgroup.nospamwrote in message
<CE**********************************@microsoft.co m>

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",FileMode.Open);
StreamReader inreader = new StreamReader(inFile);
string line = inreader.ReadLine();
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/
ro*@rob123levine.removenumbersandme.co.uk

[Marc Gravell]

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 ReadNonEmptyLines(@"c:\foo.txt"))
{
Console.WriteLine(line);
}
}

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

[Marc Gravell]

"interator block"
stupid fingers... iterator block

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

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 ReadNonEmptyLines(@"c:\foo.txt"))
{
Console.WriteLine(line);
}
}

static IEnumerable<stringReadNonEmptyLines(string path)
{
using (TextReader reader = File.OpenText(path))
{
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]]

On Apr 15, 4:05*am, Manjree Garg <[e-mail]:

* *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]]

On Apr 15, 3:34*am, Marc Gravell <[e-mail]:

"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]]

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

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
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