Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / ndp / fx / src / Net / System / Net / NetworkInformation / NetworkAddressChange.cs / 1 / 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.SupportsIPv4){ 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.SupportsIPv4 && (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.SupportsIPv4){ 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.SupportsIPv4 && (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
- DependencyPropertyValueSerializer.cs
- BaseTemplateBuildProvider.cs
- DataServiceRequest.cs
- DbConnectionHelper.cs
- ItemsControl.cs
- CommentAction.cs
- VirtualPathUtility.cs
- TemplatedWizardStep.cs
- ScriptReference.cs
- OpacityConverter.cs
- AuthenticationModuleElement.cs
- SoapProtocolImporter.cs
- NetworkAddressChange.cs
- Label.cs
- StatusBar.cs
- CustomSignedXml.cs
- XmlAttributeOverrides.cs
- ThicknessKeyFrameCollection.cs
- ObfuscationAttribute.cs
- ActivityTypeCodeDomSerializer.cs
- URLIdentityPermission.cs
- ProfessionalColors.cs
- CodeGroup.cs
- XPathNavigator.cs
- StringTraceRecord.cs
- SecurityPolicySection.cs
- KeyboardEventArgs.cs
- StylusShape.cs
- FirstMatchCodeGroup.cs
- XmlNavigatorFilter.cs
- TreeNodeSelectionProcessor.cs
- SocketPermission.cs
- Image.cs
- SqlRowUpdatedEvent.cs
- ContentDesigner.cs
- Rect.cs
- FillErrorEventArgs.cs
- WebRequestModuleElementCollection.cs
- ContainerActivationHelper.cs
- KeyEventArgs.cs
- XhtmlTextWriter.cs
- SoapRpcMethodAttribute.cs
- IResourceProvider.cs
- SoapAttributeAttribute.cs
- CodeTryCatchFinallyStatement.cs
- DataGridViewColumn.cs
- JsonEnumDataContract.cs
- DoubleAnimationBase.cs
- EventLogRecord.cs
- ServiceContractViewControl.Designer.cs
- ImageFormatConverter.cs
- BrowserDefinition.cs
- HwndStylusInputProvider.cs
- CalculatedColumn.cs
- VirtualPath.cs
- Errors.cs
- Oci.cs
- UserControl.cs
- FragmentNavigationEventArgs.cs
- WebPartMenu.cs
- DbProviderFactory.cs
- TextEndOfLine.cs
- AssemblyBuilder.cs
- SecurityResources.cs
- IPHostEntry.cs
- SqlPersonalizationProvider.cs
- RegistryDataKey.cs
- Int16Storage.cs
- GreenMethods.cs
- WindowsToolbar.cs
- DummyDataSource.cs
- ZipIOLocalFileDataDescriptor.cs
- OdbcFactory.cs
- SkewTransform.cs
- WorkflowApplicationEventArgs.cs
- RSAPKCS1SignatureDeformatter.cs
- SqlSupersetValidator.cs
- MLangCodePageEncoding.cs
- EditorPartDesigner.cs
- ObjectSecurity.cs
- IProvider.cs
- TextBoxLine.cs
- ApplicationId.cs
- DCSafeHandle.cs
- ImageCodecInfoPrivate.cs
- BrowserDefinitionCollection.cs
- FrameworkElement.cs
- DockingAttribute.cs
- HtmlLink.cs
- PackageDigitalSignatureManager.cs
- PersistenceProviderFactory.cs
- ErrorCodes.cs
- FileAuthorizationModule.cs
- DataRecordObjectView.cs
- SafeLocalMemHandle.cs
- XmlElementCollection.cs
- baseaxisquery.cs
- ParagraphVisual.cs
- SqlCacheDependencySection.cs
- Setter.cs