Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / fx / src / Data / System / Data / ProviderBase / WrappedIUnknown.cs / 1 / WrappedIUnknown.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- namespace System.Data.ProviderBase { using System; using System.Data.Common; using System.Runtime.CompilerServices; using System.Runtime.ConstrainedExecution; using System.Runtime.InteropServices; using System.Security; using System.Security.Permissions; using System.Threading; // We wrap the interface as a native IUnknown IntPtr so that every // thread that creates a connection will fake the correct context when // in transactions, otherwise everything is marshalled. We do this // for two reasons: first for the connection pooler, this is a significant // performance gain, second for the OLE DB provider, it doesn't marshal. internal class WrappedIUnknown : SafeHandle { internal WrappedIUnknown() : base(IntPtr.Zero, true) { } internal WrappedIUnknown(object unknown) : this() { if (null != unknown) { RuntimeHelpers.PrepareConstrainedRegions(); try {} finally { base.handle = Marshal.GetIUnknownForObject(unknown); // } } } public override bool IsInvalid { get { return (IntPtr.Zero == base.handle); } } internal object ComWrapper() { // NOTE: Method, instead of property, to avoid being evaluated at // runtime in the debugger. object value = null; bool mustRelease = false; RuntimeHelpers.PrepareConstrainedRegions(); try { DangerousAddRef(ref mustRelease); IntPtr handle = DangerousGetHandle(); value = System.Runtime.Remoting.Services.EnterpriseServicesHelper.WrapIUnknownWithComObject(handle); } finally { if (mustRelease) { DangerousRelease(); } } return value; } override protected bool ReleaseHandle() { // NOTE: The SafeHandle class guarantees this will be called exactly once. IntPtr ptr = base.handle; base.handle = IntPtr.Zero; if (IntPtr.Zero != ptr) { Marshal.Release(ptr); } return true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- namespace System.Data.ProviderBase { using System; using System.Data.Common; using System.Runtime.CompilerServices; using System.Runtime.ConstrainedExecution; using System.Runtime.InteropServices; using System.Security; using System.Security.Permissions; using System.Threading; // We wrap the interface as a native IUnknown IntPtr so that every // thread that creates a connection will fake the correct context when // in transactions, otherwise everything is marshalled. We do this // for two reasons: first for the connection pooler, this is a significant // performance gain, second for the OLE DB provider, it doesn't marshal. internal class WrappedIUnknown : SafeHandle { internal WrappedIUnknown() : base(IntPtr.Zero, true) { } internal WrappedIUnknown(object unknown) : this() { if (null != unknown) { RuntimeHelpers.PrepareConstrainedRegions(); try {} finally { base.handle = Marshal.GetIUnknownForObject(unknown); // } } } public override bool IsInvalid { get { return (IntPtr.Zero == base.handle); } } internal object ComWrapper() { // NOTE: Method, instead of property, to avoid being evaluated at // runtime in the debugger. object value = null; bool mustRelease = false; RuntimeHelpers.PrepareConstrainedRegions(); try { DangerousAddRef(ref mustRelease); IntPtr handle = DangerousGetHandle(); value = System.Runtime.Remoting.Services.EnterpriseServicesHelper.WrapIUnknownWithComObject(handle); } finally { if (mustRelease) { DangerousRelease(); } } return value; } override protected bool ReleaseHandle() { // NOTE: The SafeHandle class guarantees this will be called exactly once. IntPtr ptr = base.handle; base.handle = IntPtr.Zero; if (IntPtr.Zero != ptr) { Marshal.Release(ptr); } return true; } } } // 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
- WorkflowApplicationEventArgs.cs
- CacheSection.cs
- DataGridViewCellCollection.cs
- TrackingMemoryStream.cs
- SystemParameters.cs
- RenderingBiasValidation.cs
- ReachPageContentSerializerAsync.cs
- MultiByteCodec.cs
- mediaeventshelper.cs
- ConnectionDemuxer.cs
- CompModSwitches.cs
- ConfigurationValues.cs
- OracleLob.cs
- AssociationProvider.cs
- SByteConverter.cs
- SemaphoreFullException.cs
- CodeObjectCreateExpression.cs
- SvcMapFileLoader.cs
- ElementsClipboardData.cs
- SqlVersion.cs
- CodeTypeParameter.cs
- Model3DCollection.cs
- HighContrastHelper.cs
- InheritanceAttribute.cs
- StorageComplexPropertyMapping.cs
- DataGridViewRowPostPaintEventArgs.cs
- ContainerUtilities.cs
- WebSysDefaultValueAttribute.cs
- RewritingPass.cs
- ClrProviderManifest.cs
- SkewTransform.cs
- Empty.cs
- CodeStatementCollection.cs
- SoapAttributes.cs
- DynamicPropertyHolder.cs
- ButtonStandardAdapter.cs
- PowerStatus.cs
- BitmapInitialize.cs
- KeyNameIdentifierClause.cs
- SoapSchemaExporter.cs
- DirectoryInfo.cs
- DocumentGridPage.cs
- InputScope.cs
- UrlParameterWriter.cs
- SQLDecimalStorage.cs
- OutputCacheSettingsSection.cs
- CreationContext.cs
- ValidateNames.cs
- ClientSettingsSection.cs
- ProcessInfo.cs
- ClientSponsor.cs
- DecoderNLS.cs
- ExpressionBuilder.cs
- OpenTypeLayout.cs
- SkipQueryOptionExpression.cs
- ToolbarAUtomationPeer.cs
- WpfXamlMember.cs
- GridEntryCollection.cs
- KeyGesture.cs
- LiteralSubsegment.cs
- TraceLevelHelper.cs
- AuthenticateEventArgs.cs
- TraceSection.cs
- Trustee.cs
- RequestDescription.cs
- ExpressionPrefixAttribute.cs
- TransformCryptoHandle.cs
- XmlSchemaElement.cs
- EventKeyword.cs
- mediapermission.cs
- ListChangedEventArgs.cs
- figurelength.cs
- _LoggingObject.cs
- InternalCache.cs
- TTSVoice.cs
- EpmTargetPathSegment.cs
- Freezable.cs
- TextBoxView.cs
- MimeReturn.cs
- SessionEndingEventArgs.cs
- InkCanvasFeedbackAdorner.cs
- SchemaNamespaceManager.cs
- RegistryHandle.cs
- NamedPermissionSet.cs
- InstallHelper.cs
- MaterialGroup.cs
- AssemblyEvidenceFactory.cs
- ToolStripArrowRenderEventArgs.cs
- AgileSafeNativeMemoryHandle.cs
- PlainXmlDeserializer.cs
- XamlTreeBuilderBamlRecordWriter.cs
- Transactions.cs
- DesignerTransaction.cs
- UnicodeEncoding.cs
- PropertyToken.cs
- ClientReliableChannelBinder.cs
- Int32RectValueSerializer.cs
- ServiceModelPerformanceCounters.cs
- JumpItem.cs
- MSG.cs