Question

I need a way to insert a comma after every character in a string. So for example, if i have the string of letters

"ABCDEFGHIJKLMNOPQRSTUVWXYZ"

I need to make it so there is a comma after every letter from A, to Z,
I would like to keep the string as it is and not convert it to a char array or something like that. I dont know if thats possible but its just something id like to avoid.

How can i do this?
End result should be this:

"A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,"

Thanks

Answer 1

In .Net 4:

str = String.Join<char>(",", str) + ",";

.Net 4.0 adds a String.Join overload that takes an IEnumerable<T>.
This code calls it with String casted to IEnumerable<char>.

I need to explicitly specify the generic type parameter or it will call the params string[] overload (using a single string) instead.