<p>先交代下背景，最近我们项目组的网络真是太渣了，时常remote不了另外一个地方的机器，过个几分钟就断开连接，太烦躁了，严重影响工作心情。。。于是想着做个工具记录下每天的断开remote连接的时刻，然后将这份记录给IT人员，让他们去分析分析到底哪里出问题了。到了第二个版本，我就将这个记录汇总成了一个Report，包含了与远程机器的累计失联次数，累计失联时间，最长失联时间，最长在线时间。将失联和重新建立连接的时间点打印在控制台窗口和log文件中。效果还不错。</p>    <h2>1.项目结构：</h2>    <p style="text-align:center"><img src="https://simg.open-open.com/show/bda5b452cf4e44a24ad341c22d1e222b.png"></p>    <h2>2.结果展示：</h2>    <p>Consel窗口</p>    <p style="text-align:center"><img src="https://simg.open-open.com/show/70ccd978378fea04be8b63953a1787b0.png"></p>    <p>Log文件：</p>    <p><img src="https://simg.open-open.com/show/87cc803421f22b04ef4d3e556818bb31.png"></p>    <h2>3.原理</h2>    <h2>1.检测的原理</h2>    <p>1.1 用两个后台线程不断的去ping另外一台机器的IP地址，其中一个线程检测是否可以连接，如果可以连接，则记录时间点及状态，另外一个线程检测是否可以连接，如果不能连接，则retry ，如果连续retry 3次都不能ping通，则表示该机器失联，记录这次失联的时间点。</p>    <p>ping的代码：</p>    <pre>  <code class="language-cs">public static bool Ping(string ip)          {              options.DontFragment = true;              byte[] buffer = Encoding.ASCII.GetBytes(data);              reply = p.Send(ip, timeout, buffer, options);              if (reply.Status == System.Net.NetworkInformation.IPStatus.Success)              {                  return true;              }              else              {                  return false;              }          }</code></pre>    <p>1.2 两个线程去检测机器连接状态：</p>    <pre>  <code class="language-cs">public static void TestTargetIP1Connecting()          {              while (true)              {                  if (targetIP1lastStatus != NetworkStatus.Online)                  {                      pingTarget1Count++;                      if (PingUtil.IsConnected(targetIP1))                      {                          timePoints1.Add(new TimePoint(DateTime.Now, NetworkStatus.Online));                          targetIP1lastStatus = NetworkStatus.Online;                          Console.ForegroundColor = ConsoleColor.Green;                          Console.WriteLine(FormatConnectingConsoleLog(targetIP1, pingTarget1Count));                          Console.ForegroundColor = ConsoleColor.White;                          log1.Info(FormatConnectingFileLog(targetIP1, pingTarget1Count));                      }                  }                  Thread.Sleep(sleepTime);              }          }              public static void TestTargetIP1Disconnected()          {              while (true)              {                  if (targetIP1lastStatus != NetworkStatus.Offline && !PingUtil.IsConnected(targetIP1))                  {                      timePoints1.Add(new TimePoint(DateTime.Now, NetworkStatus.Offline));                        pingTarget1Count = 0;                      targetIP1GroupCount++;                        targetIP1lastStatus = NetworkStatus.Offline;                      Console.ForegroundColor = ConsoleColor.Red;                      Console.WriteLine(FormatDisconnectedConsoleLog(targetIP1, targetIP1GroupCount));                      Console.ForegroundColor = ConsoleColor.White;                      log1.Info(FormatDisconnectedFileLog(targetIP1, targetIP1GroupCount));                  }                  Thread.Sleep(sleepTime);              }          }</code></pre>    <p>1.3 retry的机制</p>    <pre>  <code class="language-cs">public static bool IsConnected(string ipAddress)          {              bool isConnected = true;              try              {                  RetryScope.BeginRetry(retryInterval);                  do                  {                      try                      {                          try                          {                              if (!PingUtil.Ping(ipAddress))                              {                                  throw new Exception(string.Format("{0} Disconnected", ipAddress), new Exception("Disconnected"));                              }                          }                          finally                          {                            }                          break;                      }                      catch (Exception ex)                      {                          if (!RetryScope.HandleException(ex))                          {                              throw;                          }                      }                  } while (RetryScope.Continue);                }              catch (Exception cex)              {                  isConnected = false;              }                finally              {                  RetryScope.EndRetry(retryInterval);              }              return isConnected;          }</code></pre>    <h2>2.对所有时间点进行分析</h2>    <p style="text-align:center"><img src="https://simg.open-open.com/show/b2b76ff25be4d96fe5f6e9f1878c7ddc.png"></p>    <p>2.1 统计分析的核心代码。发现用Linq超级爽，一下子就统计分析出来了。</p>    <p style="text-align:center"><img src="https://simg.open-open.com/show/894f63446e2e70baeced08ae4b814c4a.png"></p>    <p>2.2 单元测试：</p>    <p>因为每次统计分析都需要手动连网或断网来测试，所以写了这部分的单元测试。</p>    <p style="text-align:center"><img src="https://simg.open-open.com/show/557baa81cda6024b96502912fa7e4399.png"></p>    <h2>3.生成Report</h2>    <p>一个打印到Console窗口的类：ConsoleReport.cs</p>    <p>一个记录到Log4Net的日志文件中的类LogFileReport.cs</p>    <p>这两个类继承接口IExport.cs。</p>    <p style="text-align:center"><img src="https://simg.open-open.com/show/0a863cfb26ab81c979fc392a53731791.png"></p>    <p style="text-align:center"><img src="https://simg.open-open.com/show/e6daa9cf848b8d514884ffa26d1319fe.png"></p>    <h2>4.Log4Net的使用</h2>    <p style="text-align:center"><img src="https://simg.open-open.com/show/59bb4d1165d3ae0279e8007ca341a700.png"></p>    <p>Log4Net的配置文件</p>    <p style="text-align:center"><img src="https://simg.open-open.com/show/af1c7d10af4cd426e6226492413ae278.png"></p>    <p>记录日志：</p>    <p style="text-align:center"><img src="https://simg.open-open.com/show/c99b6e97ff905a1cac67b3f9ce2616a2.png"></p>    <h2>5.支持配置IP地址</h2>    <p style="text-align:center"><img src="https://simg.open-open.com/show/6e395a3bfde336331e92d832d13d399b.png"></p>    <p> </p>    <p> </p>