Write a specific line in a txt file (C#)

Question

Hello, I want to write a specific line in a text file but I don't know how to do?

I've tried this:

 string[] lines = System.IO.File.ReadAllLines("C:/" + GameTitle + "/PlayerSets.txt");
                 string li = lines [0];
                 using (StreamWriter sw = File.AppendText ("C:/" + GameTitle + "/PlayerSets.txt")) {
                     if (lines [0] != null) sw.WriteLine ("lol");
                 }

And sure, it doesn't work because Unity write add a new line, and I want it to change, not add, the line 0.

Cordialy.

Answer 1

Best Answer

Answer by HarshadK · Jul 01, 2014 at 10:39 AM

After a surface search on Google:

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VSuper · Jul 01, 2014 at 10:51 AM 0

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I've already seen these links... they don't work that's why I've post here. The 3rd link is helpful but doesn't work to, the AppendAllText just add text, it doesn't CHANGE it.

HarshadK · Jul 01, 2014 at 01:18 PM 0

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If I understand your problem correctly then what you want is this:

 void writeFile() {
 string[] lines = System.IO.File.ReadAllLines("F:/PlayerSets.txt");
 string allString = "";
     if (lines [0] != null) {
         lines [0] = "lol";
     }
     for(int i=0; i<lines.Length; i++) {
         allString += lines[i]+"\n";
     }                    System.IO.File.WriteAllText("F:/PlayerSets.txt", allString);
 }

The file reads the content from the file and replaces the first line with 'lol' and writes the remaining content with first line replaced with 'lol' to the file again.

VSuper · Jul 01, 2014 at 04:45 PM 0

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It doesn't, it just add at the end of the 2nd line (there 2 line) "lol"... it doesn't replace anything, again.

HarshadK · Jul 01, 2014 at 04:57 PM 0

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I've tested the code I provided and it works for me. Can you provide the code as to how you are using it?

VSuper · Jul 01, 2014 at 07:37 PM 0

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EDIT: it's working fine, i was using the default windows viewer, but with Notepad C++ it's ok. Thanks :)

Answer 2

Answer by drudiverse · Mar 19, 2016 at 12:11 PM

WORKING CODE:

to edit single lines using system io.

1 down vote the easiest way is :

static void lineChanger(string newText, string fileName . int line_to_edit) {

         string[] arrLine = File.ReadAllLines(fileName);
         arrLine[line_to_edit - 1] = newText;
         File.WriteAllLines(fileName, arrLine);

 }

usage :

lineChanger("new content for this line" , "sample.text" , 34);

JS

function lineChanger( newText: String, fileName :String, line_to_edit: int) {

         var arrLine : String[] = File.ReadAllLines(fileName);
         arrLine[line_to_edit - 1] = newText;
         File.WriteAllLines(fileName, arrLine);

 }

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Write a specific line in a txt file (C#)

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