Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / OleAutBinder.cs / 1 / 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. 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()); } // 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; } #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 } }
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- MailDefinition.cs
- XamlPoint3DCollectionSerializer.cs
- RNGCryptoServiceProvider.cs
- MarkupProperty.cs
- FacetDescriptionElement.cs
- WeakReadOnlyCollection.cs
- ReferencedAssembly.cs
- OracleString.cs
- HitTestFilterBehavior.cs
- XmlMapping.cs
- WindowsContainer.cs
- recordstatescratchpad.cs
- ObjectResult.cs
- BindingContext.cs
- OdbcHandle.cs
- HMAC.cs
- ActivityCodeDomReferenceService.cs
- WebScriptMetadataMessageEncoderFactory.cs
- Vector3DConverter.cs
- FontCollection.cs
- SerializationObjectManager.cs
- SubMenuStyleCollection.cs
- FixedPage.cs
- QuaternionRotation3D.cs
- Token.cs
- ListDictionary.cs
- PolicyException.cs
- DbDeleteCommandTree.cs
- ThemeableAttribute.cs
- WebPartConnectionsCancelEventArgs.cs
- Dump.cs
- TemplateApplicationHelper.cs
- ImageClickEventArgs.cs
- XmlQualifiedName.cs
- IntAverageAggregationOperator.cs
- SelectedDatesCollection.cs
- NetPeerTcpBindingElement.cs
- ConfigUtil.cs
- _UncName.cs
- AppLevelCompilationSectionCache.cs
- MouseGestureConverter.cs
- ParameterCollection.cs
- DetailsViewInsertedEventArgs.cs
- DynamicDiscoSearcher.cs
- CheckBoxPopupAdapter.cs
- DynamicExpression.cs
- TypeInitializationException.cs
- FileFormatException.cs
- TrustSection.cs
- PseudoWebRequest.cs
- StrictModeSecurityHeaderElementInferenceEngine.cs
- DocumentOrderQuery.cs
- ProtocolImporter.cs
- DiagnosticsElement.cs
- SiteMapDataSource.cs
- SqlXml.cs
- ExtensionSimplifierMarkupObject.cs
- XmlNodeChangedEventManager.cs
- ActivityInterfaces.cs
- SoapFormatter.cs
- ByteConverter.cs
- HtmlWindow.cs
- ObjectTokenCategory.cs
- TableHeaderCell.cs
- NeutralResourcesLanguageAttribute.cs
- DiagnosticsConfiguration.cs
- Stopwatch.cs
- GridView.cs
- SecurityTokenException.cs
- SessionParameter.cs
- HttpHeaderCollection.cs
- OutOfMemoryException.cs
- InvalidProgramException.cs
- IOThreadScheduler.cs
- DataFormat.cs
- InternalPermissions.cs
- LocatorManager.cs
- TimeSpanConverter.cs
- InputReferenceExpression.cs
- Compiler.cs
- SynchronizedDispatch.cs
- InputLanguage.cs
- OptionUsage.cs
- HighContrastHelper.cs
- DataGridViewImageCell.cs
- TextParagraphView.cs
- ResourceIDHelper.cs
- GifBitmapEncoder.cs
- StaticResourceExtension.cs
- PropertyMapper.cs
- TagNameToTypeMapper.cs
- SqlBinder.cs
- DataColumnChangeEvent.cs
- ACL.cs
- TextBlock.cs
- BindingObserver.cs
- FillErrorEventArgs.cs
- XAMLParseException.cs
- Vector3dCollection.cs
- SHA512CryptoServiceProvider.cs