C# String/Array Replacement

Question

this is kinda hard to explain, but I will try my best.

So I want to have 3 TextBoxes.

TextBox 1(Input): "X:Y:Z"

TextBox 2(Input): "A:B"

TextBox 3(Output):

Now for each Line I want to Compare Y and A. Each Lines in TextBox1 Looks like this: "ABC:123:DEF" now it should split out 123 and compare it with A, which is splitted from B aswell.

If it equals it should give out in TextBox3: X:B:Z If not it shouldn't give it out in TextBox3.

EXAMPLES:

TB1: abc:123:def 
TB2: 123:bla 
TB3: abc:bla:def
------      
TB1: abc:741:def 
TB2: 345:bla 
TB3: no output

This is what I got:

private void button1_Click(object sender, EventArgs e)
{
    var textToReplace = textBox1.Text.Split(':');
    var replacementArray = textBox2.Text.Split(':');

    if (replacementArray.Length == 2)
    {
        textBox3.Clear();

        for (var i = 0; i < textToReplace.Length; i++)
        {
            if (i > 0)
            {
                textBox3.AppendText(":");
            }

            textBox3.AppendText(textToReplace[i].Replace(replacementArray[0], 
            replacementArray[1]));
        }
    }
}

IMG for 1 Line working:

For the first line it works great but not for the following. Thanks for all the HELP!

This is very confusing. Your question says 3 textboxes but you only give 2 examples. I suggest editing to try to make this more clear — maccettura
– maccettura, Commented Sep 21, 2018 at 18:10
Why don't you give a concrete example of what textbox 1 and 2 contains, and what the concrete and correct result in textbox 3 should be. (Please edit in improve your question with this information) — user2819245
– user2819245, Commented Sep 21, 2018 at 18:12
Fair enough, but its still very hard to understand your desired functionality. Maybe some formatting would make it more clear? — maccettura
– maccettura, Commented Sep 21, 2018 at 18:12
You'll need to first split the inputs of the text boxes to separate lines, then apply what you're doing now. — AKX
– AKX, Commented Sep 21, 2018 at 18:18

Artur Michajluk · Accepted Answer · 2018-09-21 18:33:50Z

1

Im not sure what to want to achieve. I understand it this way:

In text box 1 you have some string with token to be replaced.
In text box one you have token and after : is strong to be inserted in token place.
Text box 3 is presenting result.

Basically you want to do string replace. Am I right?

Sample code:

var input = textBox1.Text;
var tokenArr = textBox2.Text.Split(":");
var output = input.Replace(tokenArr[0], tokenArr[1]);
textBox3.Text = output;

answered Sep 21, 2018 at 18:33

Artur Michajluk

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1 Comment

Frexith Over a year ago

you pretty much got the problem the only thing is that it should scan every line in TB 2 before the ":" and should check if any of these equals TB1 token between both ":" if this equals then it should replace otherwise go to next line

Magnetron · Accepted Answer · 2018-09-21 19:09:33Z

0

What you have is a dictionary in textbox 2, so put in one, then for each line of tb1 you can search the right value.

string tb1 = @"abc:123:def
abc:741:def2
xxx:345:bla3";
string tb2 = @"123:bla
345:bla2";
string tb3="";

var repDic = new Dictionary<string,string>();
foreach(var line in tb2.Split(new string[]{Environment.NewLine}, StringSplitOptions.RemoveEmptyEntries))
{
    var spl = line.Split(':');
    if(!repDic.ContainsKey(spl[0]))
    {
        repDic.Add(spl[0],spl[1]);
    }
}

StringBuilder sb = new StringBuilder();
foreach(var line in tb1.Split(new string[]{Environment.NewLine}, StringSplitOptions.RemoveEmptyEntries))
{
    var spl = line.Split(':');
    string val;
    if(repDic.TryGetValue(spl[1],out val))
    {
        sb.AppendLine($"{spl[0]}:{val}:{spl[2]}");
    }

}
tb3 = sb.ToString();

TextBox3 Output:

abc:bla:def
xxx:bla2:bla3

answered Sep 21, 2018 at 19:09

Magnetron

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3 Comments

Frexith Over a year ago

this was just an example

Magnetron Over a year ago

@Frexith I didn't understood your comment. The code I posted is doing what you want, for each line in TextBox1 it searches a match in all lines of TextBox2, when it finds, it post the replacement in TextBox3. What I did is put an example with fake inputs (tb1, tb2) and a fake output (tb3). Just replace the fakes inputs and outputs with your textBox#.Text

Magnetron Over a year ago

@Frexith Glad to help :)

Brian Rice · Accepted Answer · 2018-09-21 18:45:25Z

0

I feel like your code works as you want... except when it has no matches it outputs the original string instead of "nothing". So add...

if (textBox1.Text == textBox3.Text) 
    textBox3.Text = "";

answered Sep 21, 2018 at 18:45

Brian Rice

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5 Comments

Frexith Over a year ago

If I put multiple lines it gives out nothing that's a thing

Brian Rice Over a year ago

what do you mean multiple lines?

Frexith Over a year ago

If I put in multiple lines in TB1 & TB2 in TB3 there is no output

Brian Rice Over a year ago

if (replacementArray.Length == 2)... this would stop it from working... because if you had two lines with two values each... the array would have 3 values... for example: "abc:456\ndef:752" would split to "abc" and "456\ndef" and "752" where \n is a newline character... note: this is the first you've mentioned about multiple lines, right?

Brian Rice Over a year ago

You would first need to do a split on '\n' and then process each separately.

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