IPGlobalProperties.GetActiveUdpListeners Method
Definition
Important
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Returns information about the Internet Protocol version 4 (IPv4) and IPv6 User Datagram Protocol (UDP) listeners on the local computer.
public:
abstract cli::array <System::Net::IPEndPoint ^> ^ GetActiveUdpListeners();
public abstract System.Net.IPEndPoint[] GetActiveUdpListeners ();
[System.Runtime.Versioning.UnsupportedOSPlatform("android")]
public abstract System.Net.IPEndPoint[] GetActiveUdpListeners ();
abstract member GetActiveUdpListeners : unit -> System.Net.IPEndPoint[]
[<System.Runtime.Versioning.UnsupportedOSPlatform("android")>]
abstract member GetActiveUdpListeners : unit -> System.Net.IPEndPoint[]
Public MustOverride Function GetActiveUdpListeners () As IPEndPoint()
Returns
An IPEndPoint array that contains objects that describe the UDP listeners, or an empty array if no UDP listeners are detected.
- Attributes
Exceptions
The call to the Win32 function GetUdpTable
failed.
Examples
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 );
}
}
public static void ShowActiveUdpListeners()
{
Console.WriteLine("Active UDP Listeners");
IPGlobalProperties properties = IPGlobalProperties.GetIPGlobalProperties();
IPEndPoint[] endPoints = properties.GetActiveUdpListeners();
foreach (IPEndPoint e in endPoints)
{
Console.WriteLine(e.ToString());
}
}
Remarks
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.