int.TryParse = null if not numeric?

Question

is there some way of return null if it can\'t parse a string to int?

with:

public .... , string? categoryID) 
{
int.TryParse(categoryID, out categoryID);         


        

Answer 1

** this answer was down-voted a lot ** Although it is a possible solution - it is a bad one performance wise, and probably not a good programming choice.

I will not delete it, as I guess many programmers might not be aware of this, so here is an example how not to do things:

use try and catch

try
{
res = Int32.Parse(strVAR)
}
catch(exception ex) 
{
 return null;
}