In C#, how to check whether a string contains an integer?

Question

I just want to know, whether a String variable contains a parsable positive integer value. I do NOT want to parse the value right now.

Currently I

Answer 1

Sorry, didn't quite get your question. So something like this?

str.ToCharArray().Any(char.IsDigit);

Or does the value have to be an integer completely, without any additional strings?

if(str.ToCharArray().All(char.IsDigit(c));