C# 查看電腦連接埠使用狀態

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using System.Net.NetworkInformation;/// <summary>/// 擷取第一個可用的連接埠號碼/// </summary>/// <returns></returns>public static int GetFirstAvailablePort(){    int MAX_PORT = 6000; //系統tcp/udp連接埠數最大是65535               int BEGIN_PORT = 5000;//從這個連接埠開始檢測    for (int i = BEGIN_PORT; i < MAX_PORT; i++)    {        if (PortIsAvailable(i)) return i;    }    return -1;}/// <summary>/// 擷取作業系統已用的連接埠號碼/// </summary>/// <returns></returns>public static IList PortIsUsed(){    //擷取本機電腦的網路連接和通訊統計資料的資訊    IPGlobalProperties ipGlobalProperties = IPGlobalProperties.GetIPGlobalProperties();    //返回本機電腦上的所有Tcp監聽程式    IPEndPoint[] ipsTCP = ipGlobalProperties.GetActiveTcpListeners();    //返回本機電腦上的所有UDP監聽程式    IPEndPoint[] ipsUDP = ipGlobalProperties.GetActiveUdpListeners();    //返回本機電腦上的Internet協議版本4(IPV4 傳輸控制通訊協定(TCP)串連的資訊。    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>/// 檢查指定連接埠是否已用/// </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;}

C# 查看電腦連接埠使用狀態