ReadLine() from multiline string variable

[Guest]

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)
{...

 

[Bruce Wood]

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)
{...

Try looking into the StringReader class.

 

[Linda Liu [MSFT]]

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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[Guest]

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?

 

[Guest]

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?

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

 

[Guest]

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!