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
- FormatSettings.cs
- CompressEmulationStream.cs
- BindingValueChangedEventArgs.cs
- AutoCompleteStringCollection.cs
- ScriptComponentDescriptor.cs
- RectangleF.cs
- LZCodec.cs
- ImageKeyConverter.cs
- ControlUtil.cs
- StoreItemCollection.Loader.cs
- GlobalizationSection.cs
- ConfigurationProperty.cs
- DropTarget.cs
- _UriTypeConverter.cs
- _NegoStream.cs
- ParameterCollection.cs
- RedirectionProxy.cs
- RenderingEventArgs.cs
- UnsupportedPolicyOptionsException.cs
- ListViewInsertEventArgs.cs
- StylusPointCollection.cs
- RealProxy.cs
- BCryptSafeHandles.cs
- CompoundFileStorageReference.cs
- SubMenuStyleCollection.cs
- Visual.cs
- Pen.cs
- DrawingContextWalker.cs
- RewritingProcessor.cs
- SystemIcmpV4Statistics.cs
- WebPartsPersonalizationAuthorization.cs
- XmlElementElementCollection.cs
- VsPropertyGrid.cs
- StateRuntime.cs
- SqlDataSourceConfigureFilterForm.cs
- Camera.cs
- DoubleKeyFrameCollection.cs
- NullableLongMinMaxAggregationOperator.cs
- CodePageEncoding.cs
- CustomAttributeSerializer.cs
- SRef.cs
- BCryptNative.cs
- TypographyProperties.cs
- ObjectStateEntryDbUpdatableDataRecord.cs
- InvalidPropValue.cs
- ReadOnlyActivityGlyph.cs
- ComplexBindingPropertiesAttribute.cs
- CodeSubDirectory.cs
- NullableIntMinMaxAggregationOperator.cs
- SQLInt16.cs
- WebBrowserNavigatedEventHandler.cs
- MediaElementAutomationPeer.cs
- SafeBitVector32.cs
- GridToolTip.cs
- TextStore.cs
- CompatibleIComparer.cs
- MultipleViewPattern.cs
- FontFamily.cs
- AncillaryOps.cs
- CustomAttributeSerializer.cs
- MetadataPropertyAttribute.cs
- NotFiniteNumberException.cs
- ObjectStateFormatter.cs
- WSSecurityOneDotZeroSendSecurityHeader.cs
- EnvelopedPkcs7.cs
- SmtpCommands.cs
- Wizard.cs
- InternalCache.cs
- ColumnMapProcessor.cs
- HtmlDocument.cs
- ZoneIdentityPermission.cs
- SqlUdtInfo.cs
- BitmapInitialize.cs
- shaperfactoryquerycacheentry.cs
- HtmlInputReset.cs
- SqlRowUpdatedEvent.cs
- ServiceDescription.cs
- UnauthorizedWebPart.cs
- UInt16Storage.cs
- XPathNodeIterator.cs
- Clock.cs
- DataSourceControlBuilder.cs
- PropertyChangingEventArgs.cs
- SoapAttributes.cs
- QilXmlWriter.cs
- OutputCacheSettingsSection.cs
- Events.cs
- _MultipleConnectAsync.cs
- DataGridColumnHeadersPresenterAutomationPeer.cs
- WebPartConnectionsCloseVerb.cs
- EnumerationRangeValidationUtil.cs
- DesignTable.cs
- securitycriticaldata.cs
- PropertyChangingEventArgs.cs
- CodeNamespace.cs
- TypeInfo.cs
- MemberMaps.cs
- SqlNode.cs
- XsdBuildProvider.cs
- EntityDataSourceWrapperCollection.cs