IPGlobalProperties::GetActiveUdpListeners Method

Returns information about the Internet Protocol version 4 (IPv4) and IPv6 User Datagram Protocol (UDP) listeners on the local computer.

Namespace:  System.Net.NetworkInformation
Assembly:  System (in System.dll)

public:
virtual array<IPEndPoint^>^ GetActiveUdpListeners() abstract

Return Value

Type: array<System.Net::IPEndPoint>
An IPEndPoint array that contains objects that describe the UDP listeners, or an empty array if no UDP listeners are detected.

ExceptionCondition
NetworkInformationException

The call to the Win32 function GetUdpTable failed.

UDP is a connectionless transport layer protocol that is responsible for sending and receiving datagrams. It is defined in IETF RFC 768.

A UDP listener is an open socket that waits for and receives UDP datagrams. Because UDP is a connectionless protocol, the listener does not maintain a connection to a remote endpoint.

The following example displays the active UDP listeners.

void ShowActiveUdpListeners()
{
   Console::WriteLine( "Active UDP Listeners" );
   IPGlobalProperties ^ properties = IPGlobalProperties::GetIPGlobalProperties();
   array<IPEndPoint^>^endPoints = properties->GetActiveUdpListeners();
   System::Collections::IEnumerator^ myEnum8 = endPoints->GetEnumerator();
   while ( myEnum8->MoveNext() )
   {
      IPEndPoint^ e = safe_cast<IPEndPoint^>(myEnum8->Current);
      Console::WriteLine( e );
   }
}

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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