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using System.Net.NetworkInformation; /// <summary> /// 获取第一个可用的端口号 /// </summary> /// <returns></returns> public static int GetFirstAvailablePort() { int MAX_PORT = 6000; //系统tcp/udp端口数最大是65535 int BEGIN_PORT = 5000;//从这个端口开始检测 for (int i = BEGIN_PORT; i < MAX_PORT; i++) { if (PortIsAvailable(i)) return i; } return -1; } /// <summary> /// 获取操作系统已用的端口号 /// </summary> /// <returns></returns> public static IList PortIsUsed() { //获取本地计算机的网络连接和通信统计数据的信息 IPGlobalProperties ipGlobalProperties = IPGlobalProperties.GetIPGlobalProperties(); //返回本地计算机上的所有Tcp监听程序 IPEndPoint[] ipsTCP = ipGlobalProperties.GetActiveTcpListeners(); //返回本地计算机上的所有UDP监听程序 IPEndPoint[] ipsUDP = ipGlobalProperties.GetActiveUdpListeners(); //返回本地计算机上的Internet协议版本4(IPV4 传输控制协议(TCP)连接的信息。 TcpConnectionInformation[] tcpConnInfoArray = ipGlobalProperties.GetActiveTcpConnections(); IList allPorts = new ArrayList(); foreach (IPEndPoint ep in ipsTCP) allPorts.Add(ep.Port); foreach (IPEndPoint ep in ipsUDP) allPorts.Add(ep.Port); foreach (TcpConnectionInformation conn in tcpConnInfoArray) allPorts.Add(conn.LocalEndPoint.Port); return allPorts; } /// <summary> /// 检查指定端口是否已用 /// </summary> /// <param name="port"></param> /// <returns></returns> public static bool PortIsAvailable(int port) { bool isAvailable = true; IList portUsed = PortIsUsed(); foreach (int p in portUsed) { if (p == port) { isAvailable = false; break; } } return isAvailable; }
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原文地址:http://www.cnblogs.com/Kconnie/p/4675153.html