C# adding a character in a string

Question

I know I can append to a string but I want to be able to add a specific character after every 5 characters within the string

from this string alpha = abcdefghijklmnopqrstuvwxyz

to this string alpha = abcde-fghij-klmno-pqrst-uvwxy-z

user_13574233 · Answer

You can use this:

string alpha = "abcdefghijklmnopqrstuvwxyz";
int length = alpha.Length;
    
for (int i = length - ((length - 1) % 5 + 1); i > 0; i -= 5)
{
    alpha = alpha.Insert(i, "-");
}

Works perfectly with any string. As always, the size doesn't matter. ;)

C# adding a character in a string

8 Answers