Replace method in C# not working for individual character?

I've bee开发者_运维百科n looking around and it seems like I'm using this properly, but the results are failing. I want to go through and get rid of any 0's and replace them with o's.

newString = strOld.Replace('0', 'o'); // doesn't work.

newString = strOld.Replace("0", "o"); // doesn't work either.  

Am I doing something wrong?

I made this test, and it works fine:

class Program
{
    static void Main(string[] args)
    {
        var newString = "M0000".Replace('0', 'o');
    }
}

Try a small test case, similar to the one I created, and see what happens.

Turns out in order to use the replace method it had to go into the same string. So while this won't work:

String newString;

String oldString = "b00k";

newString = oldString.Replace('0', 'o');

This will work:

String newString = "b00k";

newString = newString.Replace('0', 'o');

Appreciate all the feedback.

I was facing the same problem, actually just for information, I was doing something thing like myOldString.Replace("#", "No.");. It was not working, I checked it. Finally I found the solution, when i replaced the above string as myOldString = myOldString.Replace("#","No"); string.replace makes a replica, earlier i was not assigning that to the actual string. Make sure you are not making such t

Works fine here... the char version should work regardless of case if they were letters (I assume you're trying to replace zeroes with an lowercase O). Are you maybe using a font that does not distinguish between zero and the letter O or something like that?

You're not doing anything wrong. If you want to do a character replace instead of a string replace you need to do: s.Replace(char.Parse("0"), char.Parse("o")), but I can't think of any reason your code doesn't work.

The following link shows this very clearly: http://www.dotnetperls.com/replace If you use string.Replace, it has to be assigned (as mentioned above by Geeklat):

String newString = "b00k";
newString = newString.Replace('0', 'o');

If you use "StringBuilder" the variable not have to be assigned - Here is a Sample Program (Output is below):

using System;
using System.Text;
class Program
    {
    static void Main()
    {
    const string s = "This is an example.";

    // A
    // Create new StringBuilder from string
    StringBuilder b = new StringBuilder(s);
    Console.WriteLine(b);

    // B
    // Replace the first word
    // The result doesn't need assignment
    b.Replace("This", "Here");
    Console.WriteLine(b);

    // C
    // Insert the string at the beginning
    b.Insert(0, "Sentence: ");
    Console.WriteLine(b);
    }
}

Output:

This is an example.
Here is an example.
Sentence: Here is an example.