CODEWITHSUNDEEP
c#stringwinformsedittrim
European Riven
European Riven

Reputation: 43

C# Automation Multiline String Trim

I am wondering how I can trim every string of an array after a certain char, for example I have 1 textbox in which I put a multiline string like:

HelloWorld:123

IAmABerliner:JFK

and then I want to click a Button and in the second TextBox everything in every line should be trimmed after the ":"

Output in Textbox 2:

HelloWorld

IamABerliner

Upvotes: 4

Views: 596

Answers (6)

Caleb Johnson
Caleb Johnson

Reputation: 410

This might not be the most elegant solution, but this is what I came up with.

string input = TextBox1.Text;
string[] input_split = input.Split(Environment.NewLine.ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
string output = "";
for(int i = 0; i < input_split.Length; i++)
{
    string[] split_again = input_split[i].Split(':');
    output += split_again[0];
}
TextBox2.Text = output;

I tested it and it gave the desired output.

Upvotes: 0

Arslan Ali
Arslan Ali

Reputation: 460

Following simple Code using StringBuilder and split working for me.

StringBuilder sb = new StringBuilder();
var st = textBox1.Text.Split('\n');
for (int i = 0; i < st.Length; i++)
{
   sb.AppendLine(st[i].Split(':')[0]);
}
textBox2.Text = sb.ToString();

Upvotes: 0

Ilya Chernomordik
Ilya Chernomordik

Reputation: 30265

You can use this little snippet to get the string you want:

string trimmedInput = string.Join(
    "\n", 
    input
       .Split('\n')
       .Select(s => s.Substring(0, s.IndexOf(":"))));

It firsts gets an array of all lines, then trims it after the semicolon and then puts them back together in one string rather an array of lines.

Upvotes: 0

Kenneth K.
Kenneth K.

Reputation: 3039

Just an alternative, and I'd really prefer the other methods, but you could also use regex:

txtInput.Text = System.Text.RegularExpressions.Regex.Replace(txtInput.Text, "(?m):.*$", string.Empty);
  • (?m) turns on multiline mode
  • : matches literal colon
  • .* matches zero or more (*) of any character except newline (.)
  • $ matches the end of the line (but not the newline) due to multiline mode being enabled

Upvotes: 1

Guilherme
Guilherme

Reputation: 5341

Use the string.Split method, and take just the first part of it:

string result = textBox2.Text.Split(':')[0];

For multiline strings:

string result = string.Empty;

foreach (string line in textBox2.Text.Split(Environment.NewLine.ToCharArray()))
{
    result += line.Split(':')[0] + Environment.NewLine;
}

Upvotes: -2

maccettura
maccettura

Reputation: 10818

WinForms Texboxes have a Lines property.

You can iterate over those lines using Linq and split on :, then take the First() index

someTextBox.Lines = someTextBox.Lines.Select(x => x.Split(':').First()).ToArray();

Upvotes: 4

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