C# read text from a certain line number from string

Question

1.00/5 (2 votes)

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lets say i got a string which has 2 lines in it

[] = the new line like enviermentail line and it not part of the string but is an example of collection of strings

C#

StringCollection text = "That [] Hat";

so as you can see there are 2 lines, "That" is on line 1 and "Hat" is on line 2

I want to be able to read line 2, for example

C#

this.text = text.line2.tostring();

and text.line2.tostring(); will be "Hat"

so i was wondering if some one can help me achieve this goal?

Posted 14-Aug-12 23:50pm

C.CoderCreator

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Comments

Kenneth Haugland 15-Aug-12 5:53am

\n is new line in a string...

Andreas Gieriet 15-Aug-12 5:54am

Homework? If yes, please mark as such in the tags...
Cheers
Andi

[no name] 15-Aug-12 6:51am

not not even finished school, im a couple of years of making this homework

Andreas Gieriet 15-Aug-12 6:59am

Your way of expressing things is beyond my capabilities. I give up.
Good luck!
Andi

3 solutions

Solution 2

try something like this.

C#

static void Main(string[] args)
       {
           StringCollection TEXT = new StringCollection();
           TEXT.Add("That");
           TEXT.Add(Environment.NewLine);
           TEXT.Add("Hat");
           TEXT.Add(Environment.NewLine);
           TEXT.Add("Hat2");
           int i = 0;
           foreach (string str in TEXT)
           {
               if (str==Environment.NewLine)
                   i=i+1;
               else if(i==2)
                   Console.WriteLine(str);
           }
           Console.Read();
       }

here i==2 means i want 2nd line..it will return me Hat2
if i give i==1 it will give me 1st line..it will return me Hat

Posted 15-Aug-12 0:07am

Santhosh Kumar Jayaraman

Updated 15-Aug-12 0:14am

v2

Comments

[no name] 15-Aug-12 6:44am

I took some of the code to make it look simlar to what i want it

foreach (string str in Properties.Settings.Default.Dock1)
{
if (addpicnumber == 2)
{
this.Text = str;
}
}

right now it just reads the last line, but haven't fully understoon the code, still trying to find the part where i pick the line the text is on

Santhosh Kumar Jayaraman 15-Aug-12 6:45am

you looking for some explanaton for my code?

[no name] 15-Aug-12 6:48am

yeh, just the part where it will read the certain line plz

Santhosh Kumar Jayaraman 15-Aug-12 6:54am

Ok i am setting an integer variable i=0..this will be the counter to check how many new lines are there.
int i = 0;
foreach (string str in TEXT)
{

Now whenever the string is Environment.newline , am incrementing the i variable. So when it comes first, then i=1. Then it willgo to the next text in Stringcollection. here am setting which line i want to get..If i need hat in my example then it comes after first environment.newline.. So when it is reading next line i.2 Hat i am checking i==1, and it will be true , so it will return Hat.

Incase if i want 3rd line.i.e.Hat2 which comes after 2nd enviroment.newline,, i am checking i==2..Like that
if (str==Environment.NewLine)
i=i+1;
else if(i==2)
Console.WriteLine(str);
}

Solution 3

Your question is a bit unclear:
- your [] seems not to be real, but rather for \n, etc, correct (see below)?
- do the lines need to have stripped off the leading and trailing white spaces?
- does it need to handle \r\n, \n\r, \r, \n?

BTW: See Escaping in C#: characters, strings, string formats, keywords, identifiers[^] for escapes in a string.

A solution may be:

C#

// split at new lines, remove empty lines, remove leading and trailing white spaces
public static string[] GetLines(string fullText)
{
    return fullText.Split(new[] {'\n'}, StringSplitOptions.RemoveEmptyEntries)
                   .Select(line => line.Trim())
                   .ToArray();
}

Cheers
Andi

Posted 15-Aug-12 0:10am

Andreas Gieriet

Comments

[no name] 15-Aug-12 6:31am

im tring to read a line number from string like i want to read the text in line 4

Andreas Gieriet 15-Aug-12 6:39am

You get an array, so, access it as follows:


string fullText = ... // e.g. File.ReadAllText(someFileName);
var lines = GetLines(fullText);
foreach(var line in lines)
{
   Console.WriteLine(line);
}
// or random access lines:
Console.WriteLine("Line 1: {0}", lines [0]);
// note: 1st line at index pos 0
//       2nd line at index pos 1
//       etc.
<code>

Cheers
Andi

[no name] 16-Aug-12 9:23am

can you plz convert this code into a stringcollcion? not file text lines?

Andreas Gieriet 16-Aug-12 14:40pm

I leave that for your exercise.
If you don't manage to do that, please acquire the very basics of (C#) programming first. There are plenty of valuable tutorials around.
Cheers
Andi

[no name] 16-Aug-12 21:34pm

not for this part, thats why i asked

Andreas Gieriet 17-Aug-12 3:16am

Do you understand the example in MSDN: StringCollection Class?

If not, you lack some very basics of C# programming. If so, please fill these gaps first.

If you understand that example, than I don't see why you ask me to modify my code above to StringCollection.

Andi

[no name] 17-Aug-12 5:23am

no i do not understand it

Andreas Gieriet 17-Aug-12 7:24am

How about C# Tutorial, just to name one...
Andi

Andreas Gieriet 15-Aug-12 6:54am

I don't understand what you want: what exactly do you mean "read a line number from string"? Does the string contain (line) numbers and you want to read some/all numbers, or do you want the read one specific line (the line #4)? Your wording is very confusing.

Elsewhere in this thread you talk about resources from the Properties. What is the problem you *really* want to solve?
Cheers
Andi

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Manas Bhardwaj · Accepted Answer · 2012-08-14T23:57:00

Solution 1

C#

string GetLine(string text, int lineNo) 
{ 
  string[] lines = text.Replace("\r","").Split('\n'); 
  return lines.Length >= lineNo ? lines[lineNo-1] : null; 
}

Posted 14-Aug-12 23:57pm

Manas Bhardwaj

v2

Comments

[no name] 15-Aug-12 6:27am

please explain all

Prasad_Kulkarni 17-Aug-12 0:20am

5'ed

Manas Bhardwaj 17-Aug-12 3:09am

thx!