Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / System / Windows / Threading / DispatcherSynchronizationContext.cs / 1407647 / DispatcherSynchronizationContext.cs
using System; using System.Threading; using System.Diagnostics; using System.ComponentModel; using System.Security; // CAS using System.Security.Permissions; // Registry permissions namespace System.Windows.Threading { ////// SynchronizationContext subclass used by the Dispatcher. /// public sealed class DispatcherSynchronizationContext : SynchronizationContext { ////// Constructs a new instance of the DispatcherSynchroniazationContext /// using the current Dispatcher. /// public DispatcherSynchronizationContext() : this(Dispatcher.CurrentDispatcher) { } ////// Constructs a new instance of the DispatcherSynchroniazationContext /// using the specified Dispatcher. /// public DispatcherSynchronizationContext(Dispatcher dispatcher) { if(dispatcher == null) { throw new ArgumentNullException("dispatcher"); } _dispatcher = dispatcher; // Tell the CLR to call us when blocking. SetWaitNotificationRequired(); } ////// Synchronously invoke the callback in the SynchronizationContext. /// public override void Send(SendOrPostCallback d, Object state) { _dispatcher.Invoke(DispatcherPriority.Normal, d, state); } ////// Asynchronously invoke the callback in the SynchronizationContext. /// public override void Post(SendOrPostCallback d, Object state) { _dispatcher.BeginInvoke(DispatcherPriority.Normal, d, state); } ////// Wait for a set of handles. /// ////// Critical - Calls WaitForMultipleObjectsEx which has a SUC. /// [SecurityCritical] [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.ControlPolicy|SecurityPermissionFlag.ControlEvidence)] public override int Wait(IntPtr[] waitHandles, bool waitAll, int millisecondsTimeout) { if(_dispatcher._disableProcessingCount > 0) { // Call into native code directly in order to avoid the default // CLR locking behavior which pumps messages under contention. // Even though they try to pump only the COM messages, any // messages that have been SENT to the window are also // dispatched. This can lead to unpredictable reentrancy. return MS.Win32.UnsafeNativeMethods.WaitForMultipleObjectsEx(waitHandles.Length, waitHandles, waitAll, millisecondsTimeout, false); } else { return SynchronizationContext.WaitHelper(waitHandles, waitAll, millisecondsTimeout); } } ////// Create a copy of this SynchronizationContext. /// public override SynchronizationContext CreateCopy() { // Because we do not contain any state that we want to preserve // in seperate instances, we just return the same synchronization // context. The CLR team assures us this is OK. return this; } internal Dispatcher _dispatcher; } } // 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
- DataMemberFieldConverter.cs
- bidPrivateBase.cs
- DesignerLoader.cs
- CodeGroup.cs
- LinqDataSource.cs
- ContextStaticAttribute.cs
- StrokeNodeOperations2.cs
- XPathNavigatorKeyComparer.cs
- EventArgs.cs
- OpCopier.cs
- XmlSchemaAttributeGroup.cs
- XmlReturnWriter.cs
- versioninfo.cs
- TypeElementCollection.cs
- KeyFrames.cs
- MethodRental.cs
- VirtualPath.cs
- SafeRegistryHandle.cs
- DataSourceSelectArguments.cs
- Control.cs
- DetailsViewModeEventArgs.cs
- DataRowChangeEvent.cs
- ClonableStack.cs
- SrgsOneOf.cs
- WebPartEditorOkVerb.cs
- RemoteWebConfigurationHostStream.cs
- Pointer.cs
- StatusBar.cs
- NullableIntAverageAggregationOperator.cs
- BackgroundWorker.cs
- cookiecollection.cs
- CheckBoxList.cs
- StringOutput.cs
- Point4D.cs
- StylusPointPropertyUnit.cs
- VectorCollection.cs
- DeclarativeCatalogPart.cs
- SharedPersonalizationStateInfo.cs
- TeredoHelper.cs
- RedBlackList.cs
- documentsequencetextpointer.cs
- util.cs
- ListBoxItemWrapperAutomationPeer.cs
- SmtpFailedRecipientsException.cs
- EdmMember.cs
- GraphicsContainer.cs
- PresentationSource.cs
- CacheVirtualItemsEvent.cs
- ItemsPresenter.cs
- WindowHelperService.cs
- DataGridViewRowsRemovedEventArgs.cs
- EventLogSession.cs
- RSAOAEPKeyExchangeDeformatter.cs
- TextServicesCompartmentEventSink.cs
- ListCollectionView.cs
- Vector.cs
- SystemColorTracker.cs
- XMLDiffLoader.cs
- PkcsMisc.cs
- DesignerActionUIService.cs
- Triplet.cs
- HotSpotCollection.cs
- SizeConverter.cs
- SymLanguageType.cs
- CaretElement.cs
- CompiledQuery.cs
- ResourceReader.cs
- LazyLoadBehavior.cs
- CapabilitiesPattern.cs
- GotoExpression.cs
- WorkflowEventArgs.cs
- ChannelPoolSettingsElement.cs
- DataControlFieldCollection.cs
- MgmtConfigurationRecord.cs
- ConfigurationErrorsException.cs
- Vector3D.cs
- AsyncWaitHandle.cs
- FilterInvalidBodyAccessException.cs
- BulletedListEventArgs.cs
- HwndSubclass.cs
- ReflectEventDescriptor.cs
- NativeCompoundFileAPIs.cs
- SystemKeyConverter.cs
- SafeRegistryKey.cs
- XmlSchemaValidationException.cs
- NamedObject.cs
- PropertyItem.cs
- SynchronousChannel.cs
- Currency.cs
- ResolvePPIDRequest.cs
- Int64KeyFrameCollection.cs
- TextSpanModifier.cs
- MetadataPropertyvalue.cs
- HtmlInputPassword.cs
- RichTextBoxConstants.cs
- HttpCapabilitiesEvaluator.cs
- WebControlAdapter.cs
- HttpApplicationFactory.cs
- IncrementalReadDecoders.cs
- TypeConverterAttribute.cs