Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / __ComObject.cs / 1305376 / __ComObject.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** Class: __ComObject ** ** ** __ComObject is the root class for all COM wrappers. This class ** defines only the basics. This class is used for wrapping COM objects ** accessed from COM+ ** ** ===========================================================*/ namespace System { using System; using System.Collections; using System.Threading; using System.Runtime.InteropServices; using System.Reflection; using System.Security.Permissions; internal class __ComObject : MarshalByRefObject { private Hashtable m_ObjectToDataMap; /*=========================================================== ** default constructor ** can't instantiate this directly =============================================================*/ private __ComObject () { } [System.Security.SecurityCritical] // auto-generated internal IntPtr GetIUnknown(out bool fIsURTAggregated) { fIsURTAggregated = !GetType().IsDefined(typeof(ComImportAttribute), false); return System.Runtime.InteropServices.Marshal.GetIUnknownForObject(this); } //=================================================================== // This method retrieves the data associated with the specified // key if any such data exists for the current __ComObject. //=================================================================== internal Object GetData(Object key) { Object data = null; // Synchronize access to the map. lock(this) { // If the map hasn't been allocated, then there can be no data for the specified key. if (m_ObjectToDataMap != null) { // Look up the data in the map. data = m_ObjectToDataMap[key]; } } return data; } //==================================================================== // This method sets the data for the specified key on the current // __ComObject. //=================================================================== internal bool SetData(Object key, Object data) { bool bAdded = false; // Synchronize access to the map. lock(this) { // If the map hasn't been allocated yet, allocate it. if (m_ObjectToDataMap == null) m_ObjectToDataMap = new Hashtable(); // If there isn't already data in the map then add it. if (m_ObjectToDataMap[key] == null) { m_ObjectToDataMap[key] = data; bAdded = true; } } return bAdded; } //==================================================================== // This method is called from within the EE and releases all the // cached data for the __ComObject. //==================================================================== [System.Security.SecurityCritical] // auto-generated internal void ReleaseAllData() { // Synchronize access to the map. lock(this) { // If the map hasn't been allocated, then there is nothing to do. if (m_ObjectToDataMap != null) { foreach (Object o in m_ObjectToDataMap.Values) { // If the object implements IDisposable, then call Dispose on it. IDisposable DisposableObj = o as IDisposable; if (DisposableObj != null) DisposableObj.Dispose(); // If the object is a derived from __ComObject, then call Marshal.ReleaseComObject on it. __ComObject ComObj = o as __ComObject; if (ComObj != null) Marshal.ReleaseComObject(ComObj); } // Set the map to null to indicate it has been cleaned up. m_ObjectToDataMap = null; } } } //=================================================================== // This method is called from within the EE and is used to handle // calls on methods of event interfaces. //==================================================================== [System.Security.SecurityCritical] // auto-generated internal Object GetEventProvider(RuntimeType t) { // Check to see if we already have a cached event provider for this type. Object EvProvider = GetData(t); // If we don't then we need to create one. if (EvProvider == null) EvProvider = CreateEventProvider(t); return EvProvider; } [System.Security.SecurityCritical] // auto-generated internal int ReleaseSelf() { return Marshal.InternalReleaseComObject(this); } [System.Security.SecurityCritical] // auto-generated internal void FinalReleaseSelf() { Marshal.InternalFinalReleaseComObject(this); } [System.Security.SecurityCritical] // auto-generated [ReflectionPermissionAttribute(SecurityAction.Assert, MemberAccess=true)] private Object CreateEventProvider(RuntimeType t) { // Create the event provider for the specified type. Object EvProvider = Activator.CreateInstance(t, Activator.ConstructorDefault | BindingFlags.NonPublic, null, new Object[]{this}, null); // Attempt to cache the wrapper on the object. if (!SetData(t, EvProvider)) { // Dispose the event provider if it implements IDisposable. IDisposable DisposableEvProv = EvProvider as IDisposable; if (DisposableEvProv != null) DisposableEvProv.Dispose(); // Another thead already cached the wrapper so use that one instead. EvProvider = GetData(t); } return EvProvider; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ServiceMemoryGates.cs
- PointLightBase.cs
- PolyBezierSegment.cs
- XmlSchemaSubstitutionGroup.cs
- ObjectStateEntry.cs
- TrackingMemoryStreamFactory.cs
- UrlMappingsModule.cs
- TableLayoutPanelCellPosition.cs
- Variable.cs
- WindowsTitleBar.cs
- IndexerNameAttribute.cs
- EncoderFallback.cs
- WebExceptionStatus.cs
- TextRunProperties.cs
- ConnectivityStatus.cs
- SqlParameter.cs
- KeyGesture.cs
- Menu.cs
- OrthographicCamera.cs
- SafeMarshalContext.cs
- DebugView.cs
- FrameworkContentElement.cs
- WorkflowTransactionService.cs
- ColumnPropertiesGroup.cs
- DbResourceAllocator.cs
- MD5HashHelper.cs
- SmiMetaData.cs
- PropertyChange.cs
- ClientSponsor.cs
- VoiceObjectToken.cs
- CellTreeNodeVisitors.cs
- DrawingGroupDrawingContext.cs
- ButtonRenderer.cs
- ZipIOExtraFieldElement.cs
- DropDownList.cs
- EntityClientCacheKey.cs
- ConfigurationErrorsException.cs
- UserControl.cs
- Int16Animation.cs
- SerialReceived.cs
- SchemaHelper.cs
- XmlJsonWriter.cs
- ApplicationInfo.cs
- XmlLanguageConverter.cs
- DockProviderWrapper.cs
- LogRecordSequence.cs
- CfgParser.cs
- TokenBasedSet.cs
- ResourceKey.cs
- AutomationInteropProvider.cs
- SelectionPattern.cs
- SqlLiftIndependentRowExpressions.cs
- DiscoveryOperationContextExtension.cs
- EventTask.cs
- User.cs
- AutomationPattern.cs
- DomainUpDown.cs
- CellTreeNode.cs
- TreeNode.cs
- CancelEventArgs.cs
- DataGridColumnHeaderItemAutomationPeer.cs
- ResourceReader.cs
- EncoderParameters.cs
- Knowncolors.cs
- StoreContentChangedEventArgs.cs
- TypeNameHelper.cs
- XmlBinaryWriterSession.cs
- Encoder.cs
- QueryUtil.cs
- DataGridViewCheckBoxColumn.cs
- UrlMappingCollection.cs
- BasicAsyncResult.cs
- AuthenticationService.cs
- BindingValueChangedEventArgs.cs
- ResolveCriteriaApril2005.cs
- SystemWebCachingSectionGroup.cs
- PageThemeCodeDomTreeGenerator.cs
- SqlProfileProvider.cs
- PolicyImporterElement.cs
- XmlBinaryReader.cs
- TextModifierScope.cs
- ReferencedCollectionType.cs
- WS2007FederationHttpBindingCollectionElement.cs
- TrustManagerPromptUI.cs
- TokenBasedSetEnumerator.cs
- WorkflowServiceAttributes.cs
- WindowsGraphicsCacheManager.cs
- SqlBooleanMismatchVisitor.cs
- WebPartEditVerb.cs
- Encoding.cs
- BitmapEffectInput.cs
- PersonalizationProviderHelper.cs
- WorkflowHostingEndpoint.cs
- InstanceDescriptor.cs
- typedescriptorpermission.cs
- Executor.cs
- ToolStripSplitStackLayout.cs
- SqlPersonalizationProvider.cs
- BitmapFrameDecode.cs
- HtmlElementEventArgs.cs