基于Task定时检测网络本地网络状况

首先我们需要使用winInet.dll中的InternetGetConnectedState方法来检测本地是否连接网络，然后再通过ping的方式来获取网络状况。

然后我们采用Task来开辟一个线程来定时检测网络状况，最后自定义一个委托，然后用事件来简单的通知网络状况。

具体代码如下：

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public class NetWorkHelper  {     /// <summary>     /// 委托     /// </summary>     /// <param name="flag"></param>     /// <param name="msg"></param>     public delegate void NetStatusDelegate(bool flag, string msg);     public event NetStatusDelegate NetStatusEvent;      public void StartCheck()      {          List<string> urlls = new List<string>() { "www.baidu.com", "www.sina.com", "www.cnblogs.com", "www.163.com", "www.csdn.com" };          Task.Run(async () =>          {              await Task.Run(() =>              {                  while (true)                  {                      try                      {                          CheckServeStatus(urlls);                      }                      catch (Exception ex)                      {                          if (NetStatusEvent!=null)                          {                              NetStatusEvent(false, "网络异常");                          }                      }                      finally                      {                          System.Threading.Thread.Sleep(3000);                      }                  }              });          });      }      // <summary>      /// 检测网络连接状态      /// </summary>      /// <param name="urls"></param>      public  void CheckServeStatus(List<string> urls)      {          int errCount = 0;//ping时连接失败个数            if (!LocalConnectionStatus())          {              if (NetStatusEvent != null)              {                  NetStatusEvent(false, "网络异常--->无连接");              }          }          else if (!MyPing(urls, out errCount))          {              if ((double)errCount / urls.Count >= 0.3)              {                  if (NetStatusEvent != null)                  {                      NetStatusEvent(false, "网络异常--->连接多次无响应");                  }                                }              else              {                  if (NetStatusEvent != null)                  {                      NetStatusEvent(false, "网络异常--->网络不稳定");                  }                                }          }          else          {              if (NetStatusEvent != null)              {                  NetStatusEvent(false, "网络正常");              }          }      }      private const int INTERNET_CONNECTION_MODEM = 1;      private const int INTERNET_CONNECTION_LAN = 2;        [System.Runtime.InteropServices.DllImport("winInet.dll")]      private static extern bool InternetGetConnectedState(ref int dwFlag, int dwReserved);        /// <summary>      /// 判断本地的连接状态      /// </summary>      /// <returns></returns>      private static bool LocalConnectionStatus()      {          try          {              System.Int32 dwFlag = new Int32();              if (!InternetGetConnectedState(ref dwFlag, 0))              {                  Console.WriteLine("LocalConnectionStatus--未连网!");                  return false;              }              else              {                  if ((dwFlag & INTERNET_CONNECTION_MODEM) != 0)                  {                      Console.WriteLine("LocalConnectionStatus--采用调制解调器上网。");                      return true;                  }                  else if ((dwFlag & INTERNET_CONNECTION_LAN) != 0)                  {                      Console.WriteLine("LocalConnectionStatus--采用网卡上网。");                      return true;                  }              }          }          catch (Exception ex)          {                                      }          return false;      }      /// <summary>      /// Ping命令检测网络是否畅通      /// </summary>      /// <param name="urls">URL数据</param>      /// <param name="errorCount">ping时连接失败个数</param>      /// <returns></returns>      public static bool MyPing(List<string> urls, out int errorCount)      {          try          {              bool isconn = true;              Ping ping = new Ping();              errorCount = 0;              try              {                  PingReply pr;                  for (int i = 0; i < urls.Count; i++)                  {                      pr = ping.Send(urls[i]);                      if (pr.Status != IPStatus.Success)                      {                          isconn = false;                          errorCount++;                      }                  }              }              catch              {                  isconn = false;                  errorCount = urls.Count;              }              return isconn;          }          catch (Exception ex)          {              throw new Exception(ex.ToString());          }      }    }