Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / NetworkInformation / NetworkAddressChange.cs / 1305376 / NetworkAddressChange.cs
namespace System.Net.NetworkInformation { using System.Net; using System.Net.NetworkInformation; using System.Net.Sockets; using System.Collections; using System.Collections.Specialized; using System.ComponentModel; using System.Threading; using System.Runtime.InteropServices; [Flags] internal enum StartIPOptions {Both = 3, None = 0, StartIPv4 = 1, StartIPv6 = 2} public class NetworkAvailabilityEventArgs:EventArgs{ bool isAvailable; internal NetworkAvailabilityEventArgs(bool isAvailable){ this.isAvailable = isAvailable; } public bool IsAvailable{ get{ return isAvailable; } } } public sealed class NetworkChange{ private NetworkChange(){} static public event NetworkAvailabilityChangedEventHandler NetworkAvailabilityChanged{ add{ if (! ComNetOS.IsWin2K) throw new PlatformNotSupportedException(SR.GetString(SR.Win2000Required)); AvailabilityChangeListener.Start(value); } remove{ AvailabilityChangeListener.Stop(value); } } static public event NetworkAddressChangedEventHandler NetworkAddressChanged{ add{ if (! ComNetOS.IsWin2K) throw new PlatformNotSupportedException(SR.GetString(SR.Win2000Required)); AddressChangeListener.Start(value); } remove{ AddressChangeListener.Stop(value); } } static internal bool CanListenForNetworkChanges { get{ if (! ComNetOS.IsWin2K ) return false; return true; } } /* Consider removing static internal void UnsafeListenForNetworkChanges(NetworkAddressChangedEventHandler handler) { if (!CanListenForNetworkChanges) { throw new PlatformNotSupportedException(SR.GetString(SR.Win2000Required)); } AddressChangeListener.UnsafeStart(handler); } */ internal static class AvailabilityChangeListener{ static object syncObject = new object(); static private ListDictionary s_availabilityCallerArray = null; static NetworkAddressChangedEventHandler addressChange = null; static bool isAvailable = false; private static ContextCallback s_RunHandlerCallback = new ContextCallback(RunHandlerCallback); private static void RunHandlerCallback(object state) { ((NetworkAvailabilityChangedEventHandler) state)(null, new NetworkAvailabilityEventArgs(isAvailable)); } private static void ChangedAddress(object sender, EventArgs eventArgs) { lock(syncObject){ bool isAvailableNow = SystemNetworkInterface.InternalGetIsNetworkAvailable(); if (isAvailableNow != isAvailable) { isAvailable = isAvailableNow; DictionaryEntry[] callerArray = new DictionaryEntry[s_availabilityCallerArray.Count]; s_availabilityCallerArray.CopyTo(callerArray, 0); for (int i = 0; i < callerArray.Length; i++) { NetworkAvailabilityChangedEventHandler handler = (NetworkAvailabilityChangedEventHandler) callerArray[i].Key; ExecutionContext context = (ExecutionContext) callerArray[i].Value; if (context == null) { handler(null, new NetworkAvailabilityEventArgs(isAvailable)); } else { ExecutionContext.Run(context.CreateCopy(), s_RunHandlerCallback, handler); } } } } } internal static void Start(NetworkAvailabilityChangedEventHandler caller){ lock(syncObject){ if (s_availabilityCallerArray == null) { s_availabilityCallerArray = new ListDictionary(); addressChange = new NetworkAddressChangedEventHandler(ChangedAddress); } if (s_availabilityCallerArray.Count == 0) { isAvailable = NetworkInterface.GetIsNetworkAvailable(); AddressChangeListener.UnsafeStart(addressChange); } if ((caller != null) && (!s_availabilityCallerArray.Contains(caller))) { s_availabilityCallerArray.Add(caller, ExecutionContext.Capture()); } } } internal static void Stop(NetworkAvailabilityChangedEventHandler caller) { lock(syncObject){ s_availabilityCallerArray.Remove(caller); if(s_availabilityCallerArray.Count == 0){ AddressChangeListener.Stop(addressChange); } } } } //helper class for detecting address change events. internal unsafe static class AddressChangeListener{ static private ListDictionary s_callerArray = new ListDictionary(); static private ContextCallback s_runHandlerCallback = new ContextCallback(RunHandlerCallback); static private RegisteredWaitHandle s_registeredWait; //need to keep the reference so it isn't GC'd before the native call executes static private bool s_isListening = false; static private bool s_isPending = false; static private SafeCloseSocketAndEvent s_ipv4Socket = null; static private SafeCloseSocketAndEvent s_ipv6Socket = null; static private WaitHandle s_ipv4WaitHandle = null; static private WaitHandle s_ipv6WaitHandle = null; //callback fired when an address change occurs private static void AddressChangedCallback(object stateObject, bool signaled) { lock (s_callerArray) { //the listener was cancelled, which would only happen if we aren't listening //for more events. s_isPending = false; if (!s_isListening) { return; } s_isListening = false; // Need to copy the array so the callback can call start and stop DictionaryEntry[] callerArray = new DictionaryEntry[s_callerArray.Count]; s_callerArray.CopyTo(callerArray, 0); //wait for the next address change StartHelper(null,false,(StartIPOptions)stateObject); for (int i = 0; i < callerArray.Length; i++) { NetworkAddressChangedEventHandler handler = (NetworkAddressChangedEventHandler) callerArray[i].Key; ExecutionContext context = (ExecutionContext) callerArray[i].Value; if (context == null) { handler(null, EventArgs.Empty); } else { ExecutionContext.Run(context.CreateCopy(), s_runHandlerCallback, handler); } } } } private static void RunHandlerCallback(object state) { ((NetworkAddressChangedEventHandler) state)(null, EventArgs.Empty); } //start listening internal static void Start(NetworkAddressChangedEventHandler caller) { StartHelper(caller, true, StartIPOptions.Both); } internal static void UnsafeStart(NetworkAddressChangedEventHandler caller) { StartHelper(caller, false, StartIPOptions.Both); } private static void StartHelper(NetworkAddressChangedEventHandler caller, bool captureContext, StartIPOptions startIPOptions) { lock (s_callerArray) { // setup changedEvent and native overlapped struct. if(s_ipv4Socket == null){ Socket.InitializeSockets(); int blocking; if(Socket.OSSupportsIPv4){ blocking = -1; s_ipv4Socket = SafeCloseSocketAndEvent.CreateWSASocketWithEvent(AddressFamily.InterNetwork, SocketType.Dgram, (ProtocolType)0, true, false); UnsafeNclNativeMethods.OSSOCK.ioctlsocket(s_ipv4Socket, IoctlSocketConstants.FIONBIO,ref blocking); s_ipv4WaitHandle = s_ipv4Socket.GetEventHandle(); } if(Socket.OSSupportsIPv6){ blocking = -1; s_ipv6Socket = SafeCloseSocketAndEvent.CreateWSASocketWithEvent(AddressFamily.InterNetworkV6, SocketType.Dgram, (ProtocolType)0, true, false); UnsafeNclNativeMethods.OSSOCK.ioctlsocket(s_ipv6Socket,IoctlSocketConstants.FIONBIO,ref blocking); s_ipv6WaitHandle = s_ipv6Socket.GetEventHandle(); } } if ((caller != null) && (!s_callerArray.Contains(caller))) { s_callerArray.Add(caller, captureContext ? ExecutionContext.Capture() : null); } //if s_listener is not null, it means we are already actively listening if (s_isListening || s_callerArray.Count == 0) { return; } if(!s_isPending){ int length; SocketError errorCode; if(Socket.OSSupportsIPv4 && (startIPOptions & StartIPOptions.StartIPv4) !=0){ s_registeredWait = ThreadPool.UnsafeRegisterWaitForSingleObject( s_ipv4WaitHandle, new WaitOrTimerCallback(AddressChangedCallback), StartIPOptions.StartIPv4, -1, true ); errorCode = (SocketError) UnsafeNclNativeMethods.OSSOCK.WSAIoctl_Blocking( s_ipv4Socket.DangerousGetHandle(), (int) IOControlCode.AddressListChange, null, 0, null, 0, out length, IntPtr.Zero, IntPtr.Zero); if (errorCode != SocketError.Success) { NetworkInformationException exception = new NetworkInformationException(); if (exception.ErrorCode != (uint)SocketError.WouldBlock) { throw exception; } } errorCode = (SocketError)UnsafeNclNativeMethods.OSSOCK.WSAEventSelect(s_ipv4Socket, s_ipv4Socket.GetEventHandle().SafeWaitHandle, AsyncEventBits.FdAddressListChange); if (errorCode != SocketError.Success) { throw new NetworkInformationException(); } } if(Socket.OSSupportsIPv6 && (startIPOptions & StartIPOptions.StartIPv6) !=0){ s_registeredWait = ThreadPool.UnsafeRegisterWaitForSingleObject( s_ipv6WaitHandle, new WaitOrTimerCallback(AddressChangedCallback), StartIPOptions.StartIPv6, -1, true ); errorCode = (SocketError) UnsafeNclNativeMethods.OSSOCK.WSAIoctl_Blocking( s_ipv6Socket.DangerousGetHandle(), (int) IOControlCode.AddressListChange, null, 0, null, 0, out length, IntPtr.Zero, IntPtr.Zero); if (errorCode != SocketError.Success) { NetworkInformationException exception = new NetworkInformationException(); if (exception.ErrorCode != (uint)SocketError.WouldBlock) { throw exception; } } errorCode = (SocketError)UnsafeNclNativeMethods.OSSOCK.WSAEventSelect(s_ipv6Socket, s_ipv6Socket.GetEventHandle().SafeWaitHandle, AsyncEventBits.FdAddressListChange); if (errorCode != SocketError.Success) { throw new NetworkInformationException(); } } } s_isListening = true; s_isPending = true; } } //stop listening internal static void Stop(object caller) { lock(s_callerArray){ s_callerArray.Remove(caller); if (s_callerArray.Count == 0 && s_isListening) { s_isListening = false; } } } //ends ignoreaddresschanges } } public delegate void NetworkAddressChangedEventHandler(object sender, EventArgs e); public delegate void NetworkAvailabilityChangedEventHandler(object sender, NetworkAvailabilityEventArgs e); } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. namespace System.Net.NetworkInformation { using System.Net; using System.Net.NetworkInformation; using System.Net.Sockets; using System.Collections; using System.Collections.Specialized; using System.ComponentModel; using System.Threading; using System.Runtime.InteropServices; [Flags] internal enum StartIPOptions {Both = 3, None = 0, StartIPv4 = 1, StartIPv6 = 2} public class NetworkAvailabilityEventArgs:EventArgs{ bool isAvailable; internal NetworkAvailabilityEventArgs(bool isAvailable){ this.isAvailable = isAvailable; } public bool IsAvailable{ get{ return isAvailable; } } } public sealed class NetworkChange{ private NetworkChange(){} static public event NetworkAvailabilityChangedEventHandler NetworkAvailabilityChanged{ add{ if (! ComNetOS.IsWin2K) throw new PlatformNotSupportedException(SR.GetString(SR.Win2000Required)); AvailabilityChangeListener.Start(value); } remove{ AvailabilityChangeListener.Stop(value); } } static public event NetworkAddressChangedEventHandler NetworkAddressChanged{ add{ if (! ComNetOS.IsWin2K) throw new PlatformNotSupportedException(SR.GetString(SR.Win2000Required)); AddressChangeListener.Start(value); } remove{ AddressChangeListener.Stop(value); } } static internal bool CanListenForNetworkChanges { get{ if (! ComNetOS.IsWin2K ) return false; return true; } } /* Consider removing static internal void UnsafeListenForNetworkChanges(NetworkAddressChangedEventHandler handler) { if (!CanListenForNetworkChanges) { throw new PlatformNotSupportedException(SR.GetString(SR.Win2000Required)); } AddressChangeListener.UnsafeStart(handler); } */ internal static class AvailabilityChangeListener{ static object syncObject = new object(); static private ListDictionary s_availabilityCallerArray = null; static NetworkAddressChangedEventHandler addressChange = null; static bool isAvailable = false; private static ContextCallback s_RunHandlerCallback = new ContextCallback(RunHandlerCallback); private static void RunHandlerCallback(object state) { ((NetworkAvailabilityChangedEventHandler) state)(null, new NetworkAvailabilityEventArgs(isAvailable)); } private static void ChangedAddress(object sender, EventArgs eventArgs) { lock(syncObject){ bool isAvailableNow = SystemNetworkInterface.InternalGetIsNetworkAvailable(); if (isAvailableNow != isAvailable) { isAvailable = isAvailableNow; DictionaryEntry[] callerArray = new DictionaryEntry[s_availabilityCallerArray.Count]; s_availabilityCallerArray.CopyTo(callerArray, 0); for (int i = 0; i < callerArray.Length; i++) { NetworkAvailabilityChangedEventHandler handler = (NetworkAvailabilityChangedEventHandler) callerArray[i].Key; ExecutionContext context = (ExecutionContext) callerArray[i].Value; if (context == null) { handler(null, new NetworkAvailabilityEventArgs(isAvailable)); } else { ExecutionContext.Run(context.CreateCopy(), s_RunHandlerCallback, handler); } } } } } internal static void Start(NetworkAvailabilityChangedEventHandler caller){ lock(syncObject){ if (s_availabilityCallerArray == null) { s_availabilityCallerArray = new ListDictionary(); addressChange = new NetworkAddressChangedEventHandler(ChangedAddress); } if (s_availabilityCallerArray.Count == 0) { isAvailable = NetworkInterface.GetIsNetworkAvailable(); AddressChangeListener.UnsafeStart(addressChange); } if ((caller != null) && (!s_availabilityCallerArray.Contains(caller))) { s_availabilityCallerArray.Add(caller, ExecutionContext.Capture()); } } } internal static void Stop(NetworkAvailabilityChangedEventHandler caller) { lock(syncObject){ s_availabilityCallerArray.Remove(caller); if(s_availabilityCallerArray.Count == 0){ AddressChangeListener.Stop(addressChange); } } } } //helper class for detecting address change events. internal unsafe static class AddressChangeListener{ static private ListDictionary s_callerArray = new ListDictionary(); static private ContextCallback s_runHandlerCallback = new ContextCallback(RunHandlerCallback); static private RegisteredWaitHandle s_registeredWait; //need to keep the reference so it isn't GC'd before the native call executes static private bool s_isListening = false; static private bool s_isPending = false; static private SafeCloseSocketAndEvent s_ipv4Socket = null; static private SafeCloseSocketAndEvent s_ipv6Socket = null; static private WaitHandle s_ipv4WaitHandle = null; static private WaitHandle s_ipv6WaitHandle = null; //callback fired when an address change occurs private static void AddressChangedCallback(object stateObject, bool signaled) { lock (s_callerArray) { //the listener was cancelled, which would only happen if we aren't listening //for more events. s_isPending = false; if (!s_isListening) { return; } s_isListening = false; // Need to copy the array so the callback can call start and stop DictionaryEntry[] callerArray = new DictionaryEntry[s_callerArray.Count]; s_callerArray.CopyTo(callerArray, 0); //wait for the next address change StartHelper(null,false,(StartIPOptions)stateObject); for (int i = 0; i < callerArray.Length; i++) { NetworkAddressChangedEventHandler handler = (NetworkAddressChangedEventHandler) callerArray[i].Key; ExecutionContext context = (ExecutionContext) callerArray[i].Value; if (context == null) { handler(null, EventArgs.Empty); } else { ExecutionContext.Run(context.CreateCopy(), s_runHandlerCallback, handler); } } } } private static void RunHandlerCallback(object state) { ((NetworkAddressChangedEventHandler) state)(null, EventArgs.Empty); } //start listening internal static void Start(NetworkAddressChangedEventHandler caller) { StartHelper(caller, true, StartIPOptions.Both); } internal static void UnsafeStart(NetworkAddressChangedEventHandler caller) { StartHelper(caller, false, StartIPOptions.Both); } private static void StartHelper(NetworkAddressChangedEventHandler caller, bool captureContext, StartIPOptions startIPOptions) { lock (s_callerArray) { // setup changedEvent and native overlapped struct. if(s_ipv4Socket == null){ Socket.InitializeSockets(); int blocking; if(Socket.OSSupportsIPv4){ blocking = -1; s_ipv4Socket = SafeCloseSocketAndEvent.CreateWSASocketWithEvent(AddressFamily.InterNetwork, SocketType.Dgram, (ProtocolType)0, true, false); UnsafeNclNativeMethods.OSSOCK.ioctlsocket(s_ipv4Socket, IoctlSocketConstants.FIONBIO,ref blocking); s_ipv4WaitHandle = s_ipv4Socket.GetEventHandle(); } if(Socket.OSSupportsIPv6){ blocking = -1; s_ipv6Socket = SafeCloseSocketAndEvent.CreateWSASocketWithEvent(AddressFamily.InterNetworkV6, SocketType.Dgram, (ProtocolType)0, true, false); UnsafeNclNativeMethods.OSSOCK.ioctlsocket(s_ipv6Socket,IoctlSocketConstants.FIONBIO,ref blocking); s_ipv6WaitHandle = s_ipv6Socket.GetEventHandle(); } } if ((caller != null) && (!s_callerArray.Contains(caller))) { s_callerArray.Add(caller, captureContext ? ExecutionContext.Capture() : null); } //if s_listener is not null, it means we are already actively listening if (s_isListening || s_callerArray.Count == 0) { return; } if(!s_isPending){ int length; SocketError errorCode; if(Socket.OSSupportsIPv4 && (startIPOptions & StartIPOptions.StartIPv4) !=0){ s_registeredWait = ThreadPool.UnsafeRegisterWaitForSingleObject( s_ipv4WaitHandle, new WaitOrTimerCallback(AddressChangedCallback), StartIPOptions.StartIPv4, -1, true ); errorCode = (SocketError) UnsafeNclNativeMethods.OSSOCK.WSAIoctl_Blocking( s_ipv4Socket.DangerousGetHandle(), (int) IOControlCode.AddressListChange, null, 0, null, 0, out length, IntPtr.Zero, IntPtr.Zero); if (errorCode != SocketError.Success) { NetworkInformationException exception = new NetworkInformationException(); if (exception.ErrorCode != (uint)SocketError.WouldBlock) { throw exception; } } errorCode = (SocketError)UnsafeNclNativeMethods.OSSOCK.WSAEventSelect(s_ipv4Socket, s_ipv4Socket.GetEventHandle().SafeWaitHandle, AsyncEventBits.FdAddressListChange); if (errorCode != SocketError.Success) { throw new NetworkInformationException(); } } if(Socket.OSSupportsIPv6 && (startIPOptions & StartIPOptions.StartIPv6) !=0){ s_registeredWait = ThreadPool.UnsafeRegisterWaitForSingleObject( s_ipv6WaitHandle, new WaitOrTimerCallback(AddressChangedCallback), StartIPOptions.StartIPv6, -1, true ); errorCode = (SocketError) UnsafeNclNativeMethods.OSSOCK.WSAIoctl_Blocking( s_ipv6Socket.DangerousGetHandle(), (int) IOControlCode.AddressListChange, null, 0, null, 0, out length, IntPtr.Zero, IntPtr.Zero); if (errorCode != SocketError.Success) { NetworkInformationException exception = new NetworkInformationException(); if (exception.ErrorCode != (uint)SocketError.WouldBlock) { throw exception; } } errorCode = (SocketError)UnsafeNclNativeMethods.OSSOCK.WSAEventSelect(s_ipv6Socket, s_ipv6Socket.GetEventHandle().SafeWaitHandle, AsyncEventBits.FdAddressListChange); if (errorCode != SocketError.Success) { throw new NetworkInformationException(); } } } s_isListening = true; s_isPending = true; } } //stop listening internal static void Stop(object caller) { lock(s_callerArray){ s_callerArray.Remove(caller); if (s_callerArray.Count == 0 && s_isListening) { s_isListening = false; } } } //ends ignoreaddresschanges } } public delegate void NetworkAddressChangedEventHandler(object sender, EventArgs e); public delegate void NetworkAvailabilityChangedEventHandler(object sender, NetworkAvailabilityEventArgs e); } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- FunctionDescription.cs
- externdll.cs
- MetadataCacheItem.cs
- DataBindingsDialog.cs
- AppliedDeviceFiltersEditor.cs
- PrintDialog.cs
- DataTableMapping.cs
- util.cs
- ProxyWebPartConnectionCollection.cs
- DataGridViewTextBoxCell.cs
- AnnotationResourceChangedEventArgs.cs
- DisplayMemberTemplateSelector.cs
- ConfigurationSchemaErrors.cs
- StylusPointPropertyId.cs
- TraceXPathNavigator.cs
- LineGeometry.cs
- DiscriminatorMap.cs
- ReceiveSecurityHeaderEntry.cs
- SchemaType.cs
- StatusCommandUI.cs
- EncoderFallback.cs
- QilLiteral.cs
- DataRowView.cs
- DefaultObjectMappingItemCollection.cs
- StandardTransformFactory.cs
- FixedSOMLineCollection.cs
- SortQueryOperator.cs
- NotCondition.cs
- TreeNodeStyle.cs
- AbstractExpressions.cs
- FileIOPermission.cs
- X509Certificate.cs
- TreeViewAutomationPeer.cs
- NotificationContext.cs
- StorageBasedPackageProperties.cs
- DictionaryItemsCollection.cs
- InputLanguageSource.cs
- EntityDataSourceMemberPath.cs
- CancellationHandlerDesigner.cs
- OrderedEnumerableRowCollection.cs
- SQLBytes.cs
- QuaternionRotation3D.cs
- SafeArrayTypeMismatchException.cs
- ResXFileRef.cs
- DataRecord.cs
- HttpCapabilitiesEvaluator.cs
- AdRotator.cs
- GenericsInstances.cs
- CommandID.cs
- LineServices.cs
- SuspendDesigner.cs
- MultiSelectRootGridEntry.cs
- ChangeBlockUndoRecord.cs
- WebServiceFault.cs
- ObjectAssociationEndMapping.cs
- EmbossBitmapEffect.cs
- OperationCanceledException.cs
- UIElement3D.cs
- CookieProtection.cs
- DesignTimeTemplateParser.cs
- ClientScriptManagerWrapper.cs
- dbdatarecord.cs
- MenuEventArgs.cs
- Rect3D.cs
- AnimationLayer.cs
- DataControlPagerLinkButton.cs
- NonVisualControlAttribute.cs
- RelatedPropertyManager.cs
- PropertyMap.cs
- ExtensionDataObject.cs
- BuildTopDownAttribute.cs
- AssemblyAttributesGoHere.cs
- XmlSchemaValidator.cs
- MailMessageEventArgs.cs
- NameValueCache.cs
- PreviewPageInfo.cs
- TextParaLineResult.cs
- Viewport3DAutomationPeer.cs
- WebBrowserNavigatedEventHandler.cs
- WeakReferenceKey.cs
- ValidationSummary.cs
- DateTimeFormatInfo.cs
- ControlPager.cs
- ByteAnimation.cs
- AutoFocusStyle.xaml.cs
- LinqToSqlWrapper.cs
- GeneralTransform3D.cs
- EmptyQuery.cs
- WorkItem.cs
- WinFormsSecurity.cs
- DataRowExtensions.cs
- LocatorBase.cs
- StringConverter.cs
- ComponentEditorForm.cs
- IUnknownConstantAttribute.cs
- ServiceBusyException.cs
- ToReply.cs
- FactorySettingsElement.cs
- HtmlInputHidden.cs
- GridItemPattern.cs