Reversing string lines

Question

How can I reverse string lines? Not a text file. String tekstGecmis is : "1\r\n2\r\n3\r\n"

1

2

3

To:

3

2

1

I tried

string son = String.Empty;
StringBuilder ters = new StringBuilder();
for (int i = 1; i < 4; i++)
{
    string[] lines = tekstGecmis.Split('\r','\n');
    string last_line = lines[lines.Length - i];
    
    ters.AppendLine(son + last_line);
    
    son = ters.ToString();
}

There are plenty of questions and documentation about reversing lists/arrays/... - when asking questions author is expected to demonstrate what they found researching the solution and how it did not work in they case. — Alexei Levenkov, Feb 05 '17 at 05:57

score 4 · Answer 1 · 2017-02-04T13:46:33.837

4

you can try this

string text = "1\r\n2\r\n3\r\n";

Console.WriteLine(string.Join("\r\n", text.Split('\r','\n').Reverse()));

working example

edited Feb 04 '17 at 13:46

answered Feb 04 '17 at 12:38

score 1 · Answer 2 · edited Jun 20 '20 at 09:12

1

You can simply use the Reverse and string.Join methods. Like this:

string result = string.Join("",son.Reverse());

Result:

3

2

1

edited Jun 20 '20 at 09:12

Community

1
1

answered Feb 04 '17 at 12:29

Salah Akbari

39,330
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If it has line with `length>1` your code will reverse the line. For example 31 changes to 13 – Farzin Kanzi Feb 04 '17 at 12:35
It reverse also 123 line to 321. I want lines to stay same. Thanks – Yasar Curci Feb 04 '17 at 12:43
@YasarCurci So you need to place this code after `string[] lines = tekstGecmis.Split('\r','\n');` line and replace the `son` with `lines`. – Salah Akbari Feb 04 '17 at 12:50

score 0 · Accepted Answer · answered Feb 04 '17 at 12:36

0

This will turn "1\r\n2\r\n3\r\n" into "3\r\n2\r\n1\r\n", which is what I think you're trying to do:

str = string.Join("\r\n",
    str.Split(new[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries).Reverse());

answered Feb 04 '17 at 12:36

itsme86

19,266
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Thanks exactly what I wanted. . – Yasar Curci Feb 04 '17 at 13:17
I m using on my xamarin portable project. While on uwp platform is everything ok on Android platform doesnt work. Is it possible Android is using something else for new line( \r\n) ? – Yasar Curci Feb 08 '17 at 21:59
@YasarCurci It's possible. You can use `Environment.NewLine` instead. It's probably just `\n`. – itsme86 Feb 08 '17 at 22:33

score 0 · Answer 4 · answered Feb 04 '17 at 13:09

0

You can do this:

string str1 = "1\r\n12\r\n31";
        string[] lines = str1.Split(new char[]{'\r', '\n'}, StringSplitOptions.RemoveEmptyEntries);
        lines = lines.Reverse().ToArray();
        string result = string.Join("\r\n", lines);

answered Feb 04 '17 at 13:09

Farzin Kanzi

3,380
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score 0 · Answer 5 · answered Feb 04 '17 at 13:09

Split the string before the cycle
Inverse the cycle's direction
Calculate ters after the cycle

string son = String.Empty; StringBuilder ters = new StringBuilder(); string[] lines = tekstGecmis.Split('\r','\n'); for (int i = 3; i >= 0; i--) { ters.AppendLine(lines[i]); } son = ters.ToString();

Reversing string lines

5 Answers5