Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / 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
- CustomSignedXml.cs
- BlobPersonalizationState.cs
- EmptyEnumerable.cs
- SelectedDatesCollection.cs
- CodeAttributeArgumentCollection.cs
- MsmqAppDomainProtocolHandler.cs
- WithStatement.cs
- FillRuleValidation.cs
- RequiredFieldValidator.cs
- DoubleAnimationUsingKeyFrames.cs
- WrappedIUnknown.cs
- SolidBrush.cs
- DetailsViewRow.cs
- ComboBoxItem.cs
- SqlUtils.cs
- SubMenuStyleCollection.cs
- SafeHandles.cs
- JoinQueryOperator.cs
- ContainerVisual.cs
- InvalidDataException.cs
- UserControlParser.cs
- LineServicesCallbacks.cs
- SqlTopReducer.cs
- PointValueSerializer.cs
- ResolveMatchesMessage11.cs
- SiteMapNode.cs
- DataGridViewTopLeftHeaderCell.cs
- Boolean.cs
- Visual3D.cs
- RootProfilePropertySettingsCollection.cs
- NumericUpDown.cs
- DataGridViewRowsAddedEventArgs.cs
- ISAPIWorkerRequest.cs
- TextRangeAdaptor.cs
- TypedServiceChannelBuilder.cs
- XmlSerializableWriter.cs
- XmlLanguageConverter.cs
- ZipIOExtraField.cs
- Point3DKeyFrameCollection.cs
- DetailsViewUpdatedEventArgs.cs
- MembershipSection.cs
- DataGridViewCellStyle.cs
- Int32Storage.cs
- ApplicationSecurityManager.cs
- TypeDelegator.cs
- BrowserInteropHelper.cs
- WinFormsComponentEditor.cs
- TransportDefaults.cs
- EdmComplexTypeAttribute.cs
- EntityDataSourceContainerNameConverter.cs
- ImageSource.cs
- DispatcherObject.cs
- RevocationPoint.cs
- IPAddressCollection.cs
- ResXBuildProvider.cs
- PropertyGridView.cs
- ListItemCollection.cs
- ObjectPersistData.cs
- OleDbException.cs
- RectAnimation.cs
- EntityContainerAssociationSet.cs
- ListViewInsertEventArgs.cs
- CustomBindingElement.cs
- ZipIOCentralDirectoryDigitalSignature.cs
- TextPointer.cs
- PropertyReferenceSerializer.cs
- TextEditorMouse.cs
- SessionSwitchEventArgs.cs
- LayoutManager.cs
- Environment.cs
- FullTextState.cs
- LayoutInformation.cs
- InplaceBitmapMetadataWriter.cs
- Bitmap.cs
- AQNBuilder.cs
- ControlBuilder.cs
- LeaseManager.cs
- ResourceCategoryAttribute.cs
- ConfigurationLocationCollection.cs
- WriteableBitmap.cs
- AuthenticationServiceManager.cs
- SmiEventSink_Default.cs
- LockCookie.cs
- TypeNameConverter.cs
- DrawingAttributes.cs
- Parameter.cs
- DrawingGroup.cs
- ValidationService.cs
- RenderDataDrawingContext.cs
- _RequestCacheProtocol.cs
- panel.cs
- PagerSettings.cs
- BadImageFormatException.cs
- SqlDataSourceEnumerator.cs
- BookmarkOptionsHelper.cs
- InstanceOwnerException.cs
- ClientConfigurationHost.cs
- XmlComment.cs
- InsufficientMemoryException.cs
- NumberAction.cs