NetworkChange Class

Reference

Definition

Namespace:: System.Net.NetworkInformation

Assemblies:: System.dll, System.Net.NetworkInformation.dll

Assemblies:: netstandard.dll, System.Net.NetworkInformation.dll

Assembly:: System.Net.NetworkInformation.dll

Assembly:: System.dll

Assembly:: netstandard.dll

Source:: NetworkAddressChange.cs

Source:: NetworkAddressChange.cs

Source:: NetworkAddressChange.cs

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Allows applications to receive notification when the Internet Protocol (IP) address of a network interface, also called a network card or adapter, changes.

public ref class NetworkChange abstract sealed

public ref class NetworkChange

public ref class NetworkChange sealed

public static class NetworkChange

public class NetworkChange

public sealed class NetworkChange

type NetworkChange = class

Public Class NetworkChange

Public NotInheritable Class NetworkChange

Inheritance: Object
NetworkChange

Examples

The following code example listens for address changes and displays the status of network interfaces when a NetworkAddressChanged event occurs.

#using <System.dll>

using namespace System;
using namespace System::Net;
using namespace System::Net::NetworkInformation;
void AddressChangedCallback( Object^ /*sender*/, EventArgs^ /*e*/ )
{
   array<NetworkInterface^>^adapters = NetworkInterface::GetAllNetworkInterfaces();
   System::Collections::IEnumerator^ myEnum = adapters->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      NetworkInterface^ n = safe_cast<NetworkInterface^>(myEnum->Current);
      Console::WriteLine( "   {0} is {1}", n->Name, n->OperationalStatus );
   }
}

int main()
{
   NetworkChange::NetworkAddressChanged += gcnew NetworkAddressChangedEventHandler( AddressChangedCallback );
   Console::WriteLine( "Listening for address changes. Press any key to exit." );
   Console::ReadLine();
}

using System;
using System.Net;
using System.Net.NetworkInformation;

namespace Examples.Net.AddressChanges
{
    public class NetworkingExample
    {
        public static void Main()
        {
            NetworkChange.NetworkAddressChanged += new
            NetworkAddressChangedEventHandler(AddressChangedCallback);
            Console.WriteLine("Listening for address changes. Press any key to exit.");
            Console.ReadLine();
        }
        static void AddressChangedCallback(object sender, EventArgs e)
        {

            NetworkInterface[] adapters = NetworkInterface.GetAllNetworkInterfaces();
            foreach(NetworkInterface n in adapters)
            {
                Console.WriteLine("   {0} is {1}", n.Name, n.OperationalStatus);
            }
        }
    }
}

Imports System.Net
Imports System.Net.NetworkInformation

Public Class NetworkingExample
    Public Shared Sub Main()
        AddHandler NetworkChange.NetworkAddressChanged, AddressOf AddressChangedCallback
        Console.WriteLine("Listening for address changes. Press any key to exit.")
        Console.ReadLine()
    End Sub
    Private Shared Sub AddressChangedCallback(ByVal sender As Object, ByVal e As EventArgs)

        Dim adapters As NetworkInterface() = NetworkInterface.GetAllNetworkInterfaces()
        Dim n As NetworkInterface
        For Each n In adapters
            Console.WriteLine("   {0} is {1}", n.Name, n.OperationalStatus)
        Next n
    End Sub
End Class

Remarks

The NetworkChange class provides address change notification by raising NetworkAddressChanged events. An interface address can change for many reasons, such as a disconnected network cable, moving out of range of a wireless Local Area Network, or hardware failure.

To receive notification, you must identify your application's event handlers, which are one or more methods that perform your application-specific tasks each time the event is raised. To have a NetworkChange object call your event-handling methods when a NetworkAddressChanged event occurs, you must associate the methods with a NetworkAddressChangedEventHandler delegate, and add this delegate to the event.

Constructors

NetworkChange()

Obsolete.

Initializes a new instance of the NetworkChange class.

Methods

RegisterNetworkChange(NetworkChange)

Obsolete.

Registers a network change instance to receive network change events.

Events

NetworkAddressChanged	Occurs when the IP address of a network interface changes.
NetworkAvailabilityChanged	Occurs when the availability of the network changes.

Applies to

Produkt	Versioner
.NET	Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	2.0, 2.1
UWP	10.0

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