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

Here's a proper use of Int32.TryParse:

int? value;
int dummy;
if(Int32.TryParse(categoryID, out dummy)) {
    value = dummy;
}
else {
    value = null;
}
return value;