[C#] IP address

MVA Twenty C# Questions Explained - [ 13 How do I get my own IP address in C#.]

MVA 範例

namespace MVATwentyQuestions
{
    class Program
    {
        static void Main(string[] args)
        {
            GetPrivateIP();
            string publicIP = GetPublicIP();
            Console.WriteLine("Public IP is: {0}", publicIP);
        }
    }

    static string GetPublicIP()
    {
        String address = "";
        WebRequest request = WebRequest.Create("http://checkip.dyndns.org/");
        using (WebResponse response = request.GetResponse())
        using (StreamReader stream = new StreamReader(response.GetResponseStream()))
        {
            address = stream.ReadToEnd();
        }

        //Search for the ip in the html
        int first = address.IndexOf("Address: ") + 9;
        int last = address.LastIndexOf("</body> ");
        address = address.Substring(first, last - first);

        return address;
    }

    static void GetPrivateIP()
    {
            
        foreach (var interfaces in NetworkInterface.GetAllNetworkInterfaces())
        {
            foreach (var address in interfaces.GetIPProperties().UnicastAddresses)
            {
                if (address.Address.AddressFamily == AddressFamily.InterNetwork)
                {
                    Console.WriteLine("IP Address:  " + address.Address.ToString());
                }
            }
        }
    }
}

搜尋網路文章來了解這個主題時，發現有 GetHostByName() 這個過時方法可以使用，但實際在 VS 上使用卻會出現提示

'System.Net.Dns.GetHostByName(string)' 已過時:GetHostByName is obsoleted for this typeof, please use GetHostEntry instead

參考資料
• Twenty C# Questions Explained
• 【C#】取得Local IP(解決GetHostByName用法過時)