C# is it possible to do increment on the static string value?

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I want to increase the string value for each loop. Is it possible to increase the static string?

I know I can get the answer that I want if I put the variable inside for loop. But in this program, I want to try with static variable so that it can shares the value of it among all instances of the class.

Output that I get currently:
1
number: //10.0.0.1
2
number: //10.0.0.1
3
number: //10.0.0.1

What I have tried:

private static string number = @"//10.0.0.ZZ";

for (int i = 1; i < 4; i += 1)
     {

         number = number.Replace("ZZ", $"{i.ToString()}");
         Console.WriteLine(i);
         Console.WriteLine("number: " + number));

     }

Posted 25-Apr-22 22:43pm

Member 14771626

Updated 25-Apr-22 23:18pm

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3 solutions

Solution 2

Why are you using Replace? All you need is:

C#

string number = @"//10.0.0.";
for (int i = 1; i < 4; i += 1)
{
    Console.WriteLine($"{number}{i}");
}

Posted 25-Apr-22 23:15pm

Richard MacCutchan

Comments

CPallini 26-Apr-22 6:18am

Indeed.
That's the best solution.
5.

Richard MacCutchan 26-Apr-22 6:22am

Thanks. Rather obvious given he is already using the $-style format control.

Solution 1

It would work, but your code is wrong:

The very first time ZZ is replaced by 1 (so far so good).
Then (in the successive iterations) you have no more ZZ in your string and no replacement happens.

You should replace anything on the right side of the last dot, with the proper number.

Posted 25-Apr-22 22:54pm

CPallini

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OriginalGriff · Accepted Answer · 2022-04-25T23:18:00

Remember that strings are immutable - once created they cannot actually be changed. Every time you try to change a string, what you actually do is create a new string.

So if you use number as a template instead of replacing it each time:

C#

private static string number = @"//10.0.0.ZZ";

for (int i = 1; i < 4; i += 1)
     {
         string IP = number.Replace("ZZ", $"{i.ToString()}");
         Console.WriteLine(i);
         Console.WriteLine("number: " + IP));
     }

Or better

C#

private const string number = @"//10.0.0.ZZ";

for (int i = 1; i < 4; i++)
     {
         string IP = number.Replace("ZZ", i.ToString());
         Console.WriteLine(i);
         Console.WriteLine($"Number: {IP}");
     }