获取随机可用TCP端口号(C#)
最近开启MQTT服务,需要获取随机可用的TCP端口号,需要两步:
-
通过System.Net.NetworkInformation中的GetIPGlobalProperties,获取所有可用的端口号;
/// <summary> /// 获取所有可用的TCP端口 /// </summary> /// <param name="startPort"></param> /// <returns></returns> public static List<int> GetAllAvailableTCPPort(int startPort = 1000) { //提供本地计算机有关网络连接信息 IPGlobalProperties iPGlobalProperties = IPGlobalProperties.GetIPGlobalProperties(); //获取可用的TCP监听终结点信息 IPEndPoint[] iPEndPoints = iPGlobalProperties.GetActiveTcpListeners(); return iPEndPoints.Where(q => q.Port >= startPort && q.Port <= MaxPort).Select(q => q.Port).ToList(); }
-
采用随机数的方法,判断特定范围(1024, 65535)的可用端口。
/// <summary> /// 获取随机可用端口号 /// </summary> /// <returns></returns> public static int GetRandomPort() { List<int> portList = new List<int>(); portList = GetAllAvailableTCPPort(); int port = 0; bool IsRandomOK = true; Random random = new Random((int)DateTime.Now.Ticks); while (IsRandomOK) { port = random.Next(1024, 65535); IsRandomOK = portList.Contains(port); } return port; } // 设置最大端口号 private const int MaxPort = 65535;