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端口連接數：

  public static int PortTcpConnection(int port)
        {
            IPGlobalProperties properti = IPGlobalProperties.GetIPGlobalProperties();
            var
 
 tcps = properti.GetActiveTcpConnections().ToList();

            var list = tcps.Where(f => f.LocalEndPoint.Port == port);

            var iplist = list.GroupBy(f => f.RemoteEndPoint.Address);
            return iplist.Count();
        }

網站連接數：

 public List<WebSite> ListSite()
        {
            List<WebSite> list = new List<WebSite>();
 

            using (ServerManager sm = new ServerManager())
            {
                foreach (var s in sm.Sites)
                {
                    WebSite site = new WebSite();
                    site.ID = s.Id;
                    site.SiteName = s.Name;
                    site.ApplicationPoolName
 
 = s.Applications["/"].ApplicationPoolName;
                    site.PhysicalPath = s.Applications["/"].VirtualDirectories["/"].PhysicalPath;
                    site.State = s.State.ToString();

                    //System.Management.ManagementObject o = new ManagementObject("Win32_PerfFormattedData_W3SVC_WebService.Name=‘" + s.Name + "‘"); 
                    //site.CurrentConnections = int.Parse(o.Properties["CurrentConnections"].Value.ToString());這個太慢

                    int tcps = 0;
                    foreach (var tmp in s.Bindings)
                    {
                        WebSite.Bind bind = new WebSite.Bind();
                        bind.IP = tmp.EndPoint.Address.ToString();
                        bind.Port = tmp.EndPoint.Port;
                        bind.Host = tmp.Host;
                        tcps += Util.SystemInfo.PortTcpConnection(bind.Port);
                        site.BindList.Add(bind);
                    }
                    site.CurrentConnections = tcps;//當前連接數
                    list.Add(site);
                }
            }
            return list;
        }

c# 獲取端口的連接數，網站的連接數