[Go] C # get the native available port

When we are going to create a tcp/udp Server connection, we need a port ranging from 1000 to 65535. However, a port can only be monitored by one program, so we need to detect if the port is occupied when we listen locally. The namespace System.Net.NetworkInformation defines a class named Ipglobalproperties, which we use to get all the listening connections and then determine if the ports are occupied.

1 //----------------------------------------------------------------------------- 2 //Filename:FreePort.cs3 // 4 //Description:helper methods to find the next free UDP and TCP ports.5 // 6 //History :7 //Clauson Aaron Copied fromhttp://www.mattbrindley.com/developing/windows/net/detecting-the-next-available-free-tcp-port/. 8 //-----------------------------------------------------------------------------9 Ten usingSystem; One usingSystem.Collections.Generic; A usingSystem.Linq; - usingSystem.Net; - usingSystem.Net.NetworkInformation; the usingSystem.Text; - usingSystem.Threading; -  - namespaceSIPSorcery.Sys.Net + {  -      Public classFreePort +     {  A         Private Const stringPortreleaseguid ="8875bd8e-4d5b-11de-b2f4-691756d89593"; at  -         /// <summary>  -         ///Check If Startport is available, incrementing and -         ///checking again if it ' s in use until a free port is found -         /// </summary>  -         /// <param name= "Startport" >The first port to check</param>  in         /// <returns>The first available port</returns>  -          Public Static intFindnextavailabletcpport (intstartport) to         {  +             intPort =Startport; -             BOOLIsAvailable =true; the  *             varMutex =NewMutex (false,  $                 string. Concat ("global/", Portreleaseguid)); Panax Notoginseng mutex. WaitOne ();  -             Try  the             {  +Ipglobalproperties ipglobalproperties = A ipglobalproperties.getipglobalproperties (); theipendpoint[] Endpoints = + ipglobalproperties.getactivetcplisteners (); -  $                  Do  $                 {  -                     if(!isavailable) -                     {  theport++;  -IsAvailable =true; Wuyi                     } the  -                     foreach(IPEndPoint EndPointinchendpoints) Wu                     {  -                         if(Endpoint.port! = Port)Continue;  AboutIsAvailable =false;  $                          Break;  -                     } -  -} while(!isavailable && Port <ipendpoint.maxport); A  +                 if(!isavailable) the                     Throw NewApplicationException ("Not able to find a free TCP port."); -  $                 returnPort; the             }  the             finally  the             {  the mutex. ReleaseMutex ();  -             }  in         } the  the         /// <summary>  About         ///Check If Startport is available, incrementing and the         ///checking again if it ' s in use until a free port is found the         /// </summary>  the         /// <param name= "Startport" >The first port to check</param>  +         /// <returns>The first available port</returns>  -          Public Static intFindnextavailableudpport (intstartport) the         { Bayi             intPort =Startport; the             BOOLIsAvailable =true; the  -             varMutex =NewMutex (false,  -                 string. Concat ("global/", Portreleaseguid));  the mutex. WaitOne ();  the             Try  the             {  theIpglobalproperties ipglobalproperties = - ipglobalproperties.getipglobalproperties (); theipendpoint[] Endpoints = the ipglobalproperties.getactiveudplisteners (); the 94                  Do  the                 {  the                     if(!isavailable) the                     { 98port++;  AboutIsAvailable =true;  -                     }101 102                     foreach(IPEndPoint EndPointinchendpoints)103                     { 104                         if(Endpoint.port! =Port) the                             Continue; 106IsAvailable =false; 107                          Break; 108                     }109  the} while(!isavailable && Port <ipendpoint.maxport);111  the                 if(!isavailable)113                     Throw NewApplicationException ("Not able to find a free TCP port."); the  the                 returnPort; the             } 117             finally 118             { 119 mutex. ReleaseMutex ();  -             } 121         } 122     } 123}

[Go] C # get the native available port