Thousand separated value to integer

Question

I want to convert a thousand separated value to integer but am getting one exception.

double d = Convert.ToDouble("100,100,100"); 

is working fine and getting d=100100100

int n = Convert.ToInt32("100,100,100");

is getting one format exception

Input string was not in a correct format

Why?

Answer 1

try this:

int i = Int32.Parse("100,100,100", NumberStyles.AllowThousands);

Note that the Parse method will throw an exception on an invalid string, so you might also want to check out the TryParse method as well:

string s = ...;
int i;
if (Int32.TryParse(s, NumberStyles.AllowThousands, CultureInfo.InvariantCulture, out i))
{
    // if you are here, you were able to parse the string 
}

Answer 2

What Convert.ToInt32 is actually calling in your example is Int32.Parse.

The Int32.parse(string) method only allows three types of input: white space, a sign, and digits. In the following configuration [ws][sign]digits[ws] (in brackets are optional).

Since your's contained commas, it threw an exception.