Question

Possible Duplicate:
string split in c#

Hello guys i am getting connected ip address from socket which is looks like this: >> “188.169.28.103:61635” how i can put ip address into one string and port into another?
Thanks.

Answer 1

Personally I’d use Substring:

int colonIndex = text.IndexOf(':');
if (colonIndex == -1)
{
    // Or whatever
    throw new ArgumentException("Invalid host:port format");
}
string host = text.Substring(0, colonIndex);
string port = text.Substring(colonIndex + 1);

Mark mentioned using string.Split which is a good option too – but then you should probably check the number of parts:

string[] parts = s.Split(':');
if (parts.Length != 2)
{
    // Could be just one part, or more than 2...
    // throw an exception or whatever
}
string host = parts[0];
string port = parts[1];

Or if you’re happy with the port part containing a colon (as my Substring version does) then you can use:

// Split into at most two parts
string[] parts = s.Split(new char[] {':'}, 2);
if (parts.Length != 2)
{
    // This time it means there's no colon at all
    // throw an exception or whatever
}
string host = parts[0];
string port = parts[1];

Another alternative would be to use a regular expression to match the two parts as groups. To be honest I’d say that’s overkill at the moment, but if things became more complicated it may become a more attractive option. (I tend to use simple string operations until things start getting hairy and more “pattern-like”, at which point I break out regular expressions with some trepidation.)