Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / __ComObject.cs / 1 / __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 () { } 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. //==================================================================== 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. //==================================================================== internal Object GetEventProvider(Type 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; } internal int ReleaseSelf() { return Marshal.InternalReleaseComObject(this); } internal void FinalReleaseSelf() { Marshal.InternalFinalReleaseComObject(this); } [ReflectionPermissionAttribute(SecurityAction.Assert, MemberAccess=true)] private Object CreateEventProvider(Type 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; } } }
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- SiteMapNode.cs
- SafeHandles.cs
- LinkedList.cs
- ProtocolsConfiguration.cs
- XPathNavigator.cs
- ReadOnlyDataSource.cs
- BitConverter.cs
- RewritingProcessor.cs
- HandledMouseEvent.cs
- FixedSOMPageElement.cs
- BrowserCapabilitiesFactory.cs
- AttachedPropertyBrowsableAttribute.cs
- transactioncontext.cs
- Button.cs
- DNS.cs
- StorageInfo.cs
- XmlEncoding.cs
- SingleAnimationBase.cs
- XamlWriter.cs
- Zone.cs
- DataSvcMapFile.cs
- PanelStyle.cs
- ZipIOZip64EndOfCentralDirectoryLocatorBlock.cs
- PeerNameRegistration.cs
- LoadRetryAsyncResult.cs
- DataGridViewTextBoxColumn.cs
- StackSpiller.Temps.cs
- BaseCollection.cs
- DataGridViewRowPostPaintEventArgs.cs
- MethodMessage.cs
- ExceptionValidationRule.cs
- FormsIdentity.cs
- Main.cs
- HttpCacheParams.cs
- ToolStripItemImageRenderEventArgs.cs
- Menu.cs
- ClientCultureInfo.cs
- TypeSystemHelpers.cs
- TextWriterTraceListener.cs
- infer.cs
- CharAnimationBase.cs
- OdbcParameterCollection.cs
- NoneExcludedImageIndexConverter.cs
- UpdateCommand.cs
- VarRemapper.cs
- XsltFunctions.cs
- RowsCopiedEventArgs.cs
- MobileControlsSectionHelper.cs
- DataGridCommandEventArgs.cs
- StringExpressionSet.cs
- ConnectionModeReader.cs
- CqlErrorHelper.cs
- SQLSingle.cs
- FileNotFoundException.cs
- DataExchangeServiceBinder.cs
- TypeExtensionConverter.cs
- LicenseException.cs
- COM2FontConverter.cs
- Opcode.cs
- PerformanceCounterPermissionEntry.cs
- UserInitiatedNavigationPermission.cs
- WindowsFormsDesignerOptionService.cs
- DataServiceQueryContinuation.cs
- ServiceDescriptionContext.cs
- UnsafeMethods.cs
- ElementHostAutomationPeer.cs
- MostlySingletonList.cs
- ReflectionUtil.cs
- Rijndael.cs
- PreProcessInputEventArgs.cs
- Tile.cs
- SmiRecordBuffer.cs
- UserNameSecurityTokenAuthenticator.cs
- MissingFieldException.cs
- DataBinder.cs
- CalloutQueueItem.cs
- NotConverter.cs
- DataBoundControl.cs
- UIElementParaClient.cs
- QuadraticBezierSegment.cs
- PackageProperties.cs
- MaskedTextBoxTextEditorDropDown.cs
- DataPagerFieldCollection.cs
- Mouse.cs
- PropertyFilter.cs
- PageAsyncTask.cs
- ValidationPropertyAttribute.cs
- RunWorkerCompletedEventArgs.cs
- DataServiceProcessingPipeline.cs
- WorkflowDebuggerSteppingAttribute.cs
- FilterableData.cs
- WinEventTracker.cs
- X509Certificate2.cs
- CompilerLocalReference.cs
- CngAlgorithmGroup.cs
- MobileControlsSectionHelper.cs
- Enlistment.cs
- LayoutSettings.cs
- ValidationPropertyAttribute.cs
- HtmlEncodedRawTextWriter.cs