c#宽带拨号

using System;
using System.Diagnostics;
using System.IO;
using System.Net;
using System.Net.NetworkInformation;
using System.Text;
using System.Threading;

namespace soe_client
{
    /// <summary>
    /// ADSL拨号帮助类 用批处理实现
    /// </summary>
    public class ADSLIP
    {
        #region 变量
        /// <summary>
        ///生成的临时批处理文件名称
        /// </summary>
        static String _temppath = "temp.bat";
        public static String temppath
        {
            get { return ADSLIP._temppath; }
            set { ADSLIP._temppath = value; }
        }
        /// <summary>
        /// 字符串拼接用
        /// </summary>
        private static StringBuilder sb = new StringBuilder();
        /// <summary>
        /// 拨号等待 默认15秒
        /// </summary>
        public static int delay = 15;
        #endregion

        #region 方法
        /// <summary>
        /// 开始拨号
        /// </summary>
        /// <param name="ADSL_Name">宽带连接名称</param>
        /// <param name="ADSL_UserName">宽带连接用户名</param>
        /// <param name="ADSL_PassWord">宽带连接密码</param>
        public static bool ChangeIp(String ADSL_Name = "宽带连接", String ADSL_UserName = "", String ADSL_PassWord = "")
        {
            sb.Clear();
            sb.AppendLine("@echo off");
            sb.AppendLine("set adslmingzi=" + ADSL_Name);
            sb.AppendLine("set adslzhanghao=" + ADSL_UserName);
            sb.AppendLine("set adslmima=" + ADSL_PassWord);
            sb.AppendLine("@Rasdial %adslmingzi% /disconnect");
            sb.AppendLine("ping 127.0.0.1 -n 2");
            sb.AppendLine("Rasdial %adslmingzi% %adslzhanghao% %adslmima%");
            sb.AppendLine("echo 连接中");
            sb.AppendLine("ping 127.0.0.1 -n 2");
            sb.AppendLine("ipconfig");
            // sb.AppendLine("pause");

            using (StreamWriter sw = new StreamWriter(temppath, false, Encoding.Default))
            {
                sw.Write(sb.ToString());
            }
            Process p = Process.Start(temppath);
            p.WaitForExit();
            Thread.Sleep(delay * 1000);
            while (GetIP_PPPOE() == string.Empty)
            {
                Process.Start(temppath);
                p.WaitForExit();
                Thread.Sleep(2 * delay * 1000);
            }
            File.Delete(temppath);
            return true;
        }

        public static string GetIP_PPPOE(int timeout=2)
        {
            int i = timeout * 2;
            while (i > 0)
            {
                try
                {
                    NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();
                    bool havePPPOE = false;
                    foreach (NetworkInterface adapter in nics)
                    {
                        if (adapter.NetworkInterfaceType == NetworkInterfaceType.Ppp)
                        {
                            havePPPOE = true;
                            IPInterfaceProperties ip = adapter.GetIPProperties();     //IP配置信息
                            if (ip.UnicastAddresses.Count > 0)
                            {
                                return ip.UnicastAddresses[0].Address.ToString();
                            }
                        }
                    }
                    //当没有宽带连接的时候直接返回空
                    if (!havePPPOE) return string.Empty;
                }
                catch (Exception ex)
                {
                    Console.WriteLine("获取宽带拨号IP出错:" + ex.Message);
                }
                i--;
                Thread.Sleep(500);
            }
            return string.Empty;
        }
        #endregion
    }

}