How to check if my string only numeric

Question

How I can check if my string only contain numbers?

I don\'t remember. Something like isnumeric?

Answer 1

Your question is not clear. Is . allowed in the string? Is ¼ allowed?

string source = GetTheString();

//only 0-9 allowed in the string, which almost equals to int.TryParse
bool allDigits = source.All(char.IsDigit); 
bool alternative = int.TryParse(source,out result);

//allow other "numbers" like ¼
bool allNumbers = source.All(char.IsNumber);