NetworkChange Class
Allows applications to receive notification when the Internet Protocol (IP) address of a network interface, also called a network card or adapter, changes.
Assembly: System (in System.dll)
| Name | Description | |
|---|---|---|
![]() | NetworkChange() | Obsolete. Initializes a new instance of the NetworkChange class. |
| Name | Description | |
|---|---|---|
![]() | Equals(Object^) | Determines whether the specified object is equal to the current object.(Inherited from Object.) |
![]() | Finalize() | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.) |
![]() | GetHashCode() | Serves as the default hash function. (Inherited from Object.) |
![]() | GetType() | |
![]() | MemberwiseClone() | |
![]() ![]() | RegisterNetworkChange(NetworkChange^) | Obsolete. Registers a network change instance to receive network change events. |
![]() | ToString() | Returns a string that represents the current object.(Inherited from Object.) |
| Name | Description | |
|---|---|---|
![]() ![]() | NetworkAddressChanged | Occurs when the IP address of a network interface changes. |
![]() ![]() | NetworkAvailabilityChanged | Occurs when the availability of the network changes. |
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.
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(); }
Available since 8
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 3.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.



