Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Base / System / Windows / Threading / DispatcherSynchronizationContext.cs / 1 / 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() { DispatcherSynchronizationContext context = new DispatcherSynchronizationContext(_dispatcher); return context; } internal Dispatcher _dispatcher; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. 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() { DispatcherSynchronizationContext context = new DispatcherSynchronizationContext(_dispatcher); return context; } 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
- ConsoleTraceListener.cs
- ArcSegment.cs
- Baml2006ReaderFrame.cs
- EmbossBitmapEffect.cs
- HttpConfigurationContext.cs
- DesignerCalendarAdapter.cs
- RuleSettingsCollection.cs
- __ComObject.cs
- securestring.cs
- MatrixValueSerializer.cs
- JournalEntryListConverter.cs
- assemblycache.cs
- Quad.cs
- HtmlInputControl.cs
- NegotiateStream.cs
- SkipQueryOptionExpression.cs
- ApplicationServiceManager.cs
- OracleSqlParser.cs
- BitmapEffectvisualstate.cs
- SelectedCellsChangedEventArgs.cs
- _Semaphore.cs
- ScrollEvent.cs
- CollectionType.cs
- UserPersonalizationStateInfo.cs
- SqlDataSourceCache.cs
- CompilerScopeManager.cs
- EntityUtil.cs
- X509CertificateCollection.cs
- HostingPreferredMapPath.cs
- ClonableStack.cs
- PngBitmapEncoder.cs
- UndoUnit.cs
- FileSecurity.cs
- PolyBezierSegment.cs
- GuidConverter.cs
- DbTransaction.cs
- InvokeMethodDesigner.xaml.cs
- ELinqQueryState.cs
- OutputCacheProfileCollection.cs
- Point4D.cs
- RectAnimationClockResource.cs
- Selection.cs
- GeneralTransform3DGroup.cs
- DeferredSelectedIndexReference.cs
- AccessibilityHelperForVista.cs
- InteropAutomationProvider.cs
- XPathParser.cs
- Zone.cs
- PerfCounters.cs
- ExternalFile.cs
- XmlTextReaderImplHelpers.cs
- WhitespaceRule.cs
- FixUp.cs
- TypefaceMap.cs
- QilGenerator.cs
- IIS7UserPrincipal.cs
- PersonalizationEntry.cs
- PageFunction.cs
- securitymgrsite.cs
- ParameterElementCollection.cs
- AuthenticationModeHelper.cs
- XmlLinkedNode.cs
- FormsAuthenticationTicket.cs
- BitmapFrameDecode.cs
- UiaCoreTypesApi.cs
- ForeignKeyConstraint.cs
- RSAPKCS1KeyExchangeFormatter.cs
- SequenceDesignerAccessibleObject.cs
- SamlSubjectStatement.cs
- UserNameSecurityTokenParameters.cs
- TimeoutValidationAttribute.cs
- ServiceRouteHandler.cs
- RadioButtonRenderer.cs
- ComboBoxAutomationPeer.cs
- WebPartChrome.cs
- PropertyValueChangedEvent.cs
- LinqDataSourceInsertEventArgs.cs
- TimeoutValidationAttribute.cs
- Calendar.cs
- PagesChangedEventArgs.cs
- Decoder.cs
- compensatingcollection.cs
- ToolStripDropDownButton.cs
- util.cs
- PersonalizationStateQuery.cs
- Line.cs
- DataSourceView.cs
- DependencySource.cs
- TextTreeFixupNode.cs
- AutoCompleteStringCollection.cs
- AppDomainEvidenceFactory.cs
- MessageSecurityOverHttpElement.cs
- CacheDependency.cs
- XmlSchemaAnyAttribute.cs
- PropertyChangedEventManager.cs
- TextRangeBase.cs
- DynamicObject.cs
- TimeSpan.cs
- Hashtable.cs
- _UriTypeConverter.cs