How to change multiple char in string in c# .net

Question

i want to replace string like :

CD7849O => CD18490

so if you find a char in the form of 7 and O, replace them with 1 and 0 (7 => 1, O => 0)

i tried with indexofchar but it's not work

string result = "CD7849O";

string[] charToFind = { "0", "O", "I", "1", "7" };
foreach (string z in charToFind)
{
    string charFind = z;
    int indexOfChar = result.Trim().IndexOf(charFind);
    Console.WriteLine(indexOfChar);

    if (indexOfChar >= 0)
    {
        string y = "XXX";
        string x = "XXX";

       
        if (z == "0" && z == "1")
        {
            y = "O";
            x = "I";
        }
        else if (z == "O" && z == "I")
        {
            y = "0";
            x = "1";
        }
        else if (z == "O" && z == "7")
        {
            y = "0";
            x = "1";
        }

        string resultY = result.Trim().Replace(charFind, y);
        string resultHasil;
        Console.WriteLine(resultY);
    }
}

@KikiOlivia Replace finds all instances of char in string and produces a new one with the replaced characters. — Guru Stron
– Guru Stron, Commented Nov 22, 2022 at 4:55
@KikiOlivia what is your goal and what is not working in the provided code? — Guru Stron
– Guru Stron, Commented Nov 22, 2022 at 4:55

eloiz · Accepted Answer · 2022-11-22 04:30:19Z

1

Use String.Replace()

string result = "CD7849O";
// replace 7 -> 1
result = result.Replace("7", "1");
// replace O -> 0
result = result.Replace("O", "0");

answered Nov 22, 2022 at 4:30

eloiz

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3 Comments

Kiki Olivia Over a year ago

how do i find char 7 and O in string result ?, i know how to replace but I want to find if there are '7' and 'O' replace of '1' and '0'

jmcilhinney Over a year ago

@KikiOlivia, why are you specifying a requirement in a comment on an answer that you didn't specify in the question? Why would you think that it's a good idea to only provide half the relevant information in the question? Provide a FULL and CLEAR explanation in the question. That should be a given.

Guru Stron Over a year ago

OP already uses Replace

Vivek Nuna · Accepted Answer · 2022-11-22 04:53:51Z

1

Replace method will replace the char if it's found e.g. result = result.Replace("7", "1");. If you still want to check whether the char is present then you use the IndexOf method. it will return -1 if the char is not found else will return the index of the first char it finds. you can add a check if index > -1

answered Nov 22, 2022 at 4:53

Vivek Nuna

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1 Comment

Guru Stron Over a year ago

OP already uses both methods in the code.

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