c#从配置文件读取多张网卡ip

考虑到电脑有多张网卡的情况，如果使用本机ip地址有可能就会出现获取网卡错误，所以自己写了一个从配置文件读取ip信息的代码：

 

using System;using System.Collections.Generic;using System.Text;using System.Windows.Forms;using System.Net;using System.IO;using System.Xml;namespace ipconfig{   public class IpConfig    {        string m_path, m_name;      public IpConfig(string path,string name)//路径名 + 文件名  c:\\config\\config.xml        {            m_path = path;            m_name ="/"+ name;        }        public string GetIp(int num)        {            int i;            string ip="";            try            {                if (!File.Exists(m_path + m_name))                {                    DirectoryInfo d = Directory.CreateDirectory(m_path);                    XmlDocument xmldoc = new XmlDocument();                    //加入XML的声明段落                    xmldoc.AppendChild(xmldoc.CreateXmlDeclaration("1.0", "UTF-8", null));                    //加入根元素                    XmlElement xmlelem = xmldoc.CreateElement("", "AllIp", "");                    xmldoc.AppendChild(xmlelem);                    //FileName                    IPHostEntry ipHost = Dns.GetHostEntry(Dns.GetHostName());                    for (i = 1; i <= ipHost.AddressList.Length; i++)                    {//写ip到config。xml文件

                        XmlElement xmlelemFileName = xmldoc.CreateElement("Ip-" + i.ToString());                        XmlText xmltextFileName = xmldoc.CreateTextNode(GetIPList(i));                        xmlelemFileName.AppendChild(xmltextFileName);                        xmldoc.ChildNodes.Item(1).AppendChild(xmlelemFileName);                    }                    xmldoc.Save(m_path + m_name);                }                if (File.Exists(m_path + m_name))                    ip = ReadIp(num);                else                    ip = "can`t create ipconfig.xml";            }            catch (Exception ex)            {                ip = ex.Message;            }            return ip;        }        public string ReadIp(int IpNum)        {            string strIp="";            XmlElement xe;            try            {                XmlDocument xmlDoc = new XmlDocument();                xmlDoc.Load(m_path + m_name);                XmlNode xn = xmlDoc.SelectSingleNode("AllIp");                XmlNodeList xnl = xn.ChildNodes;                foreach (XmlNode xnf in xnl)                {                    xe = (XmlElement)xnf;                    if("Ip-"+IpNum.ToString()==xnf.Name)                    {                        strIp = xe.InnerText;                    break;                    }                }            }            catch (Exception ex)            {               strIp= ex.Message;            }            return strIp;        }        private string GetIPList(int netcard)   //获取iplist        {            try            {                IPHostEntry ipHost = Dns.GetHostEntry(Dns.GetHostName());                //考虑ipv6的情况 主要对应win7以上系统                int netCardCount = 0;                if (ipHost.AddressList.Length > 1)                {                    string result = "255.255.255.255";                    foreach (IPAddress ipaddr in ipHost.AddressList)                    {                        if (ipaddr.ToString().Length > result.Length)                        {                            netCardCount++;                        }                    }                }                IPAddress ipAddr = ipHost.AddressList[netcard + netCardCount - 1];                              return ipAddr.ToString();            }            catch (Exception ex)            {                return ex.Message;            }        }    }}