C#使用DotRas完成ADSL自动重连

日前,因需要使用ADSL断线重连以获取新IP,来实现某些功能,特写了一Windows service来实现该功能,在网上找了一些ADSL操作类,如调用DllImport("Rasapi32.dll")的RAS类,只能在XP下操作,在WIN7下无效,后改采用DotRas for Win7来实现,网上的DEMO多是采用DotRas连接VPN的,连接PPPOE的很少,所以折腾了很长一段时间,特此记录.

Step 1:

首先Nuget最新的DotRas for Win7

Step 2: 

用code创建一个新的PPPOE链接

/// <summary>
        /// 创建或更新一个PPPOE连接(指定PPPOE名称)
        /// </summary>
        public void CreateOrUpdatePPPOE(string updatePPPOEname)
        {
            RasDialer dialer = new RasDialer();
            RasPhoneBook allUsersPhoneBook = new RasPhoneBook();
            string path = RasPhoneBook.GetPhoneBookPath(RasPhoneBookType.AllUsers);
            allUsersPhoneBook.Open(path);
            // 如果已经该名称的PPPOE已经存在，则更新这个PPPOE服务器地址
            if (allUsersPhoneBook.Entries.Contains(updatePPPOEname))
            {
                allUsersPhoneBook.Entries[updatePPPOEname].PhoneNumber = " ";
                // 不管当前PPPOE是否连接，服务器地址的更新总能成功，如果正在连接，则需要PPPOE重启后才能起作用
                allUsersPhoneBook.Entries[updatePPPOEname].Update();
            }
            // 创建一个新PPPOE
            else
            {
                string adds = string.Empty;
                ReadOnlyCollection<RasDevice> readOnlyCollection = RasDevice.GetDevices();
//                foreach (var col in readOnlyCollection)
//                {
//                    adds += col.Name + ":" + col.DeviceType.ToString() + "|||";
//                }
//                _log.Info("Devices are : " + adds);
                // Find the device that will be used to dial the connection.
                RasDevice device = RasDevice.GetDevices().Where(o => o.DeviceType == RasDeviceType.PPPoE).First();
                RasEntry entry = RasEntry.CreateBroadbandEntry(updatePPPOEname, device);    //建立宽带连接Entry
                entry.PhoneNumber = " ";
                allUsersPhoneBook.Entries.Add(entry);
            }
        }

Step 3:

Connect:

public void Connect(string Connection)
        {
            try
            {
                CreateOrUpdatePPPOE(Connection);
                RasDialer dialer = new RasDialer();
                dialer.EntryName = Connection;
                dialer.PhoneNumber = " ";
                dialer.AllowUseStoredCredentials = true;
                dialer.PhoneBookPath = RasPhoneBook.GetPhoneBookPath(RasPhoneBookType.AllUsers);
                dialer.Credentials = new NetworkCredential("username", "password");
                dialer.Timeout = 1000;
                RasHandle myras = dialer.Dial();
                while (myras.IsInvalid)
                {
                    Thread.Sleep(1000);
                    myras = dialer.Dial();
                }
                if (!myras.IsInvalid)
                {
                    _log.Info("RasDialer Success! " + Convert.ToString(DateTime.Now));
                }
            }
            catch (Exception ex)
            {
                _log.Info("RasDialer error! " + Convert.ToString(DateTime.Now) + Connection + " error is :: " + ex.ToString());
            }
        }