Convert a string containing a hexadecimal value starting with "0x" to an integer or long

Question

How can I convert a string value like "0x310530" to an integer value in C#?

I've tried int.TryParse (and even int.TryParse with System.Globalization.NumberStyles.Any) but it does not work.

UPDATE: It seems that Convert.ToInt64 or Convert.ToInt32 work without having to remove the leading "0x":

long hwnd = Convert.ToInt64("0x310530", 16); 

The documentation of Convert.ToInt64 Method (String, Int32) says:

"If fromBase is 16, you can prefix the number specified by the value parameter with "0x" or "0X"."

However, I would prefer a method like TryParse that does not raise exceptions.

Answer 1

int value = (int)new System.ComponentModel.Int32Converter().ConvertFromString("0x310530"); 

Answer 2

From MSDN:

NumberStyles.AllowHexSpecifier

Indicates that the numeric string represents a hexadecimal value. Valid hexadecimal values include the numeric digits 0-9 and the hexadecimal digits A-F and a-f. Strings that are parsed using this style cannot be prefixed with "0x" or "&h".

So you have to strip out the 0x prefix first:

string s = "0x310530"; int result;  if (s != null && s.StartsWith("0x") && int.TryParse(s.Substring(2),                                                     NumberStyles.AllowHexSpecifier,                                                     null,                                                     out result)) {     // result == 3212592 }