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

TryParse will return false if the string can't be parsed. You can use this fact to return either the parsed value, or null. Anyway I guess that you are intending to return int? from your method, then it would be something like this:

public int? ParseInt(string categoryID) 
{
    int theIntValue;
    bool parseOk = int.TryParse(categoryID, out theIntValue);
    if(parseOk) {
        return theIntValue;
    } else {
        return null;
    }
}