ReadLine() from multiline string variable

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sam01m - 20 Jul 2007 03:42 GMT

just as the subject states, I need to find a way to read each line from a
multiline variable without having to write the string out to a file so I can
stream it in and use ReadLine(). Below is a snippet of code where I am trying
to read the string that has been passed into the function.

//source is the string of data to parse out
//nodes is the Xml Node Name in the mappingFile
("/Meters/Ion/Report/Field")
//ReadLine indicates whether to process line by line, or read as
continuous string
public List<List<Fields>> GetNodeData(string source, string node,
Boolean ReadLine)
{
//Get the field mappings.
List<Fields> record = GetFields(node);

List<List<Fields>> records = new List<List<Fields>>();

using (StreamReader sr = new StreamReader(source))
{
//this is the string of data to process
string contents = sr.ReadLine();

while (sr.Peek() >= 0)
{...

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Bruce Wood - 20 Jul 2007 04:57 GMT

> just as the subject states, I need to find a way to read each line from a
> multiline variable without having to write the string out to a file so I can
[quoted text clipped - 21 lines]
> while (sr.Peek() >= 0)
> {...

Try looking into the StringReader class.

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Linda Liu [MSFT] - 20 Jul 2007 08:03 GMT

Hi Sam,

I agree with Bruce. You could use the StringReader class for you purpose.

For more information on the StringReader class, you may refer to the
following MSDN document:

'StringReader Class'
http://msdn2.microsoft.com/en-us/library/system.io.stringreader.aspx

Hope this helps.

If you have any question, please feel free to let me know.

Sincerely,
Linda Liu
Microsoft Online Community Support

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sam01m - 20 Jul 2007 15:10 GMT

Excellent, thank you (both) for the information. the only problem I'm
finding with ReadLine() though, in either implementation (StreamReader or
StringReader), is that I'm finding it strips out trailing whitespace. I have
preformatted data to be of a very specific length, whereby sometimes the last
two spaces have values, but more often than not, they are blank.

..........example line of data:

" 13:00SI 137.76 11.37 .00 4.01 "

..........when read through ReadLine() evaluates like this:

" 13:00SI 137.76 11.37 .00 4.01"

..........problem is, sometimes the input data looks like this:

" 13:00SI 137.76AD 11.37AD .00AD 4.01AD"

..........in any case, I need a fixed string length when I parse out each
ReadLine()

Any ideas?

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Göran Andersson - 20 Jul 2007 16:36 GMT

> Excellent, thank you (both) for the information. the only problem I'm
> finding with ReadLine() though, in either implementation (StreamReader or
[quoted text clipped - 18 lines]
>
> Any ideas?

How have you determined that the ReadLine method removes the spaces?

I tried this code, and it shows that the spaces are not removed:

string input = " a\r\na \r\n a \r\na a\r\na";
using (StringReader reader = new StringReader(input)) {
    while ((line = reader.ReadLine()) != null) {
        Console.WriteLine(line.Length.ToString());
    }
}

Output:
3
3
3
3
1

Signature

Göran Andersson
_____
http://www.guffa.com

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sam01m - 20 Jul 2007 21:56 GMT

Here is my code:

public void GetNodeData(string source, string node, Boolean ReadLine)
{
using (StringReader sr = new StringReader(source))
{
string contents;

if (ReadLine == true)
{
contents = sr.ReadLine();
}
    else
    {
    contents=sr.ReadToEnd();
    }

while (contents != null)
{

contents = sr.ReadLine();
}
}
}

Here is the input string taken directly from the "source" variable at
runtime. Notice that each line contains two spaces just before \r:

" 11:00 147.02 8.24 .00 1.80 \r\n
12:00 137.22 9.47 .00 3.29 \r\n
13:00SI 137.76 11.37 .00 4.01 \r"

Here is the result of "contents = sr.ReadLine();"

" 11:00 147.02 8.24 .00 1.80 "
" 12:00 137.22 9.47 .00 3.29 "
" 13:00SI 137.76 11.37 .00 4.01 "

Hmmm.... I stand corrected, my apologies!

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ReadLine() from multiline string variable

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