How do i convert string value to int? in C#

Question

I have a string which typically is in the format "0xFF". I'll trim it since there is a chance of whitespace. How do i convert that into hex and convert "34" to decimal. I know about .Parse but does this support hex characters when the string is 0x123?

Answer 1

int i = int.Parse( "FF", System.Globalization.NumberStyles.HexNumber );
MessageBox.Show( i.ToString() );  // displays 255

However, you will need to trim the leading "0x".

Answer 2

You'll have to strip the "0x" part, but this snippet works:

using System;
using System.Globalization;

public class StrToInt {
    public static void Main(string[] args) {
        string val = "FF";
        int num = Int32.Parse(val, NumberStyles.AllowHexSpecifier);
        Console.WriteLine(num);
    }
}