C#中实现定时器Timer定时判断IP是否ping通(连通)和端口号是否telnet可达(可用)

快来打我* 2023-10-16 14:15 6阅读 0赞

## 场景 ##

Winform中使用HttpClient(设置最大超时响应时间)调用接口并做业务处理时界面卡住，使用async Task await异步任务编程优化：

[Winform中使用HttpClient(设置最大超时响应时间)调用接口并做业务处理时界面卡住，使用async Task await异步任务编程优化\_霸道流氓气质的博客-CSDN博客][Winform_HttpClient_async Task await_-CSDN]

在上面的基础上，将定时器定时调用http接口改为定时判断某ip是否联通，端口是否可用。

注：

博客：  
[霸道流氓气质\_C\#,架构之路,SpringBoot-CSDN博客][C_SpringBoot-CSDN]

## 实现 ##

1、winform上点击按钮启动定时器时

_timer.Interval = scheduleInterval;                
                        _timer.Tick += _timer_Tick;
                        _timer.Start();

绑定事件执行方法

private void _timer_Tick(object sender, EventArgs e)
            {
                    //其他业务操作
                    checkApiIpAndPort();        
            }

2、在checkApiIpAndPort方法中具体实现

private async Task checkApiIpAndPort() {
                textBox_log.AppendText(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + ":检测接口IP和端口联通状态进行中，解析接口ip为:" + Global.Instance.apiIpString + ",解析接口端口为:" + Global.Instance.apiPort);
                textBox_log.AppendText("\r\n");
    
                bool isIpViliable = await IsIpReachable(Global.Instance.apiIpString);   
                bool isPortViliable = await IsPortReachable(Global.Instance.apiIpString, Global.Instance.apiPort);   
         
                textBox_log.AppendText(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + ":检测接口IP和端口联通状态执行结束，解析接口ip为:" + Global.Instance.apiIpString + ",ip连通性为:" + isIpViliable + ",解析接口端口为:" + Global.Instance.apiPort + ",端口连通性为:" + isPortViliable);
                textBox_log.AppendText("\r\n");
            }

3、除了日志输出，就是两个关键的方法，并且是异步任务编程实现

测试IP是否联通IsIpReachable方法实现

public async Task<bool> IsIpReachable(string strIP)
            {
                // Windows L2TP VPN和非Windows VPN使用ping VPN服务端的方式获取是否可以连通
                Ping pingSender = new Ping();
                PingOptions options = new PingOptions();
                // Use the default Ttl value which is 128,
                // but change the fragmentation behavior.
                options.DontFragment = true;
                // Create a buffer of 32 bytes of data to be transmitted.
                string data = "badao";
                byte[] buffer = Encoding.ASCII.GetBytes(data);
                int timeout = 1500;
                PingReply reply = pingSender.Send(strIP, timeout, buffer, options);
                return (reply.Status == IPStatus.Success);
            }

发送的数据data随意指定即可。

测试端口是否可用IsPortReachable方法具体实现

public async Task<bool> IsPortReachable(string host, int port = 80, int msTimeout = 2000)
            {
                return await Task.Run(() =>
                {
                    var clientDone = new ManualResetEvent(false);
                    var reachable = false;
                    var hostEntry = new DnsEndPoint(host, port);
                    using (var socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
                    {
                        var socketEventArg = new SocketAsyncEventArgs { RemoteEndPoint = hostEntry };
                        socketEventArg.Completed += (s, e) =>
                        {
                            reachable = e.SocketError == SocketError.Success;
                            clientDone.Set();
                        };
                        clientDone.Reset();
                        socket.ConnectAsync(socketEventArg);
                        clientDone.WaitOne(msTimeout);
                        return reachable;
                    }
                });
            }

这么设置默认端口为80，超时时间为2秒

注意这里的Timer会有多个namespace,直接指定为

using Timer = System.Windows.Forms.Timer;

4、定时器停止

_timer.Tick -= _timer_Tick;
                    _timer.Stop();

注意要取消事件绑定

5、测试效果

![ae815f1751ab4b9daa1668c140ed2315.png][]

[Winform_HttpClient_async Task await_-CSDN]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/129755732
[C_SpringBoot-CSDN]: https://blog.csdn.net/badao_liumang_qizhi
[ae815f1751ab4b9daa1668c140ed2315.png]: https://img-blog.csdnimg.cn/ae815f1751ab4b9daa1668c140ed2315.png