How to remove port number from an IP address string

Question

i am trying to separate the IP from the port in a list box. but i am only leaving the port number and ":" how would i make it so the ":" is removed and only the IP is left.

ips look like this:

192.168.0.12:80

192.168.0.2:123

192.168.0.3:1337

  for (int i = 0; i < lb.Items.Count; i++)
        {
            string item = lb.Items[i] as string;
            item = item.Substring(item.LastIndexOf(":"));
            lb.Items[i] = item;
        }

Answer 1

您可以拆分字符串：

string ip = item.Split(":")[0]

或者您可以创建一个 Uri 对象并从中提取 Host 值

Answer 2

You could parse it into a Uri and then inspect the Host value:

String ip = "192.168.0.3:1337";
Uri uri = new Uri("http://" + ip);
MessageBox.Show(uri.Port.ToString()); //shows 1337
MessageBox.Show(uri.Host.ToString()); //shows 192.168.0.3

这具有确保 URI 有效的额外好处，并且适用于不包含 a 的地址，:而 usingIndexOf(':')则不会，因此您必须进行额外检查以查看字符串.Contains是否首先