Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / OleAutBinder.cs / 1305376 / OleAutBinder.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // This class represents the Ole Automation binder. // #define DISPLAY_DEBUG_INFO namespace System { using System; using System.Runtime.InteropServices; using System.Reflection; using Microsoft.Win32; using CultureInfo = System.Globalization.CultureInfo; // Made serializable in anticipation of this class eventually having state. [Serializable] internal class OleAutBinder : DefaultBinder { // ChangeType // This binder uses OLEAUT to change the type of the variant. [System.Security.SecuritySafeCritical] // overrides transparent member public override Object ChangeType(Object value, Type type, CultureInfo cultureInfo) { Variant myValue = new Variant(value); if (cultureInfo == null) cultureInfo = CultureInfo.CurrentCulture; #if DISPLAY_DEBUG_INFO Console.Write("In OleAutBinder::ChangeType converting variant of type: "); Console.Write(myValue.VariantType); Console.Write(" to type: "); Console.WriteLine(type.Name); #endif if (type.IsByRef) { #if DISPLAY_DEBUG_INFO Console.WriteLine("Striping byref from the type to convert to."); #endif type = type.GetElementType(); } // If we are trying to convert from an object to another type then we don't // need the OLEAUT change type, we can just use the normal COM+ mechanisms. if (!type.IsPrimitive && type.IsInstanceOfType(value)) { #if DISPLAY_DEBUG_INFO Console.WriteLine("Source variant can be assigned to destination type"); #endif return value; } Type srcType = value.GetType(); // Handle converting primitives to enums. if (type.IsEnum && srcType.IsPrimitive) { #if DISPLAY_DEBUG_INFO Console.WriteLine("Converting primitive to enum"); #endif return Enum.Parse(type, value.ToString()); } #if !FEATURE_CORECLR // Special case the convertion from DBNull. if (srcType == typeof(DBNull)) { // The requested type is a DBNull so no convertion is required. if (type == typeof(DBNull)) return value; // Visual J++ supported converting from DBNull to null so customers // have requested (via a CDCR) that DBNull be convertible to null. // We don't however allow this when converting to a value class, since null // doesn't make sense for these, or to object since this would change existing // semantics. if ((type.IsClass && type != typeof(Object)) || type.IsInterface) return null; } #endif //!FEATURE_CORECLR #if FEATURE_COMINTEROP // Use the OA variant lib to convert primitive types. try { #if DISPLAY_DEBUG_INFO Console.WriteLine("Using OAVariantLib.ChangeType() to do the conversion"); #endif // Specify the LocalBool flag to have BOOL values converted to local language rather // than 0 or -1. Object RetObj = OAVariantLib.ChangeType(myValue, type, OAVariantLib.LocalBool, cultureInfo).ToObject(); #if DISPLAY_DEBUG_INFO Console.WriteLine("Object returned from ChangeType is of type: " + RetObj.GetType().Name); #endif return RetObj; } #if DISPLAY_DEBUG_INFO catch(NotSupportedException e) #else catch(NotSupportedException) #endif { #if DISPLAY_DEBUG_INFO Console.Write("Exception thrown: "); Console.WriteLine(e); #endif throw new COMException(Environment.GetResourceString("Interop.COM_TypeMismatch"), unchecked((int)0x80020005)); } #else // !FEATURE_COMINTEROP return base.ChangeType(value, type, cultureInfo); #endif // !FEATURE_COMINTEROP } #if !FEATURE_COMINTEROP // CanChangeType public override bool CanChangeType(Object value, Type type, CultureInfo cultureInfo) { Variant myValue = new Variant(value); if (cultureInfo == null) cultureInfo = CultureInfo.CurrentCulture; #if DISPLAY_DEBUG_INFO Console.Write("In OleAutBinder::CanChangeType converting variant of type: "); Console.Write(myValue.VariantType); Console.Write(" to type: "); Console.WriteLine(type.Name); #endif // If we are trying to convert to variant then there is nothing to do. if (type == typeof(Variant)) { #if DISPLAY_DEBUG_INFO Console.WriteLine("Variant being changed to type variant is always legal"); #endif return true; } if (type.IsByRef) { #if DISPLAY_DEBUG_INFO Console.WriteLine("Striping byref from the type to convert to."); #endif type = type.GetElementType(); } // If we are trying to convert from an object to another type then we don't // need the OLEAUT change type, we can just use the normal COM+ mechanisms. if (!type.IsPrimitive && type.IsInstanceOfType(value)) { #if DISPLAY_DEBUG_INFO Console.WriteLine("Source variant can be assigned to destination type"); #endif return true; } // Handle converting primitives to enums. if (type.IsEnum && value.GetType().IsPrimitive) { #if DISPLAY_DEBUG_INFO Console.WriteLine("Converting primitive to enum"); #endif return true; } return base.CanChangeType(value, type, cultureInfo); } #endif // FEATURE_COMINTEROP } } // 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
- StyleTypedPropertyAttribute.cs
- SpecularMaterial.cs
- ConnectionOrientedTransportBindingElement.cs
- OperatorExpressions.cs
- DataContractSerializerSection.cs
- HebrewNumber.cs
- ContextDataSourceContextData.cs
- XmlIlVisitor.cs
- FixedDocumentSequencePaginator.cs
- CorrelationTokenTypeConvertor.cs
- ExpressionContext.cs
- TraversalRequest.cs
- WebPartDescriptionCollection.cs
- ExpressionTextBox.xaml.cs
- TypeBuilderInstantiation.cs
- HyperlinkAutomationPeer.cs
- XPathNodeInfoAtom.cs
- ToolStripSettings.cs
- FileDetails.cs
- EventHandlerList.cs
- CoTaskMemUnicodeSafeHandle.cs
- MetafileHeader.cs
- MultiTrigger.cs
- NodeCounter.cs
- AbstractDataSvcMapFileLoader.cs
- DragDeltaEventArgs.cs
- HttpRequest.cs
- SeekStoryboard.cs
- StyleHelper.cs
- bidPrivateBase.cs
- SecurityKeyType.cs
- RectValueSerializer.cs
- SuppressIldasmAttribute.cs
- EncryptedData.cs
- Token.cs
- ToolStripMenuItemCodeDomSerializer.cs
- coordinatorfactory.cs
- InheritablePropertyChangeInfo.cs
- XmlSchemaNotation.cs
- MimeTypeAttribute.cs
- IfAction.cs
- TypeDependencyAttribute.cs
- TypedReference.cs
- ScaleTransform.cs
- AutomationElement.cs
- StringToken.cs
- SByteStorage.cs
- DataGridViewCellErrorTextNeededEventArgs.cs
- TemplateInstanceAttribute.cs
- BrowserPolicyValidator.cs
- CustomPopupPlacement.cs
- DataGridView.cs
- XPathDocumentIterator.cs
- NegotiateStream.cs
- TextEffect.cs
- CompilationSection.cs
- WpfWebRequestHelper.cs
- XPathChildIterator.cs
- DefaultBindingPropertyAttribute.cs
- QueryOptionExpression.cs
- XmlSchemaSimpleTypeUnion.cs
- ToolboxComponentsCreatingEventArgs.cs
- DataShape.cs
- NativeActivityTransactionContext.cs
- JsonXmlDataContract.cs
- Utils.cs
- TimelineGroup.cs
- ItemChangedEventArgs.cs
- DateTimeFormat.cs
- SqlProcedureAttribute.cs
- DataMemberConverter.cs
- ReaderWriterLockWrapper.cs
- ADMembershipUser.cs
- NotifyInputEventArgs.cs
- ListViewTableRow.cs
- ResourceDisplayNameAttribute.cs
- VirtualizingPanel.cs
- Pen.cs
- CheckedPointers.cs
- TemplatePropertyEntry.cs
- HandleCollector.cs
- ObjectStateFormatter.cs
- DataControlFieldCollection.cs
- FixedSOMTable.cs
- Synchronization.cs
- EntityPropertyMappingAttribute.cs
- FindCriteria11.cs
- DiagnosticsConfiguration.cs
- PermissionToken.cs
- TreeViewAutomationPeer.cs
- DataSvcMapFileSerializer.cs
- ContainerFilterService.cs
- WebBrowserUriTypeConverter.cs
- ClientSettingsStore.cs
- DataGridBoolColumn.cs
- MeshGeometry3D.cs
- TextTreeExtractElementUndoUnit.cs
- ToolBarTray.cs
- FilteredAttributeCollection.cs
- SerializationSectionGroup.cs