Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CompMod / System / ComponentModel / DelegatingTypeDescriptionProvider.cs / 1305376 / DelegatingTypeDescriptionProvider.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.ComponentModel { using System; using System.Collections; using System.Reflection; using System.Security.Permissions; ////// This is a simple type description provider that, when invoked demand /// locates the correct type description provider for the given type and /// invokes it. This is used as the tail node for both type and instance /// based providers. Conceptually it "links" the provider list for one type /// or instance to its corresponding base type. /// [HostProtection(SharedState = true)] internal sealed class DelegatingTypeDescriptionProvider : TypeDescriptionProvider { private Type _type; ////// Creates a new DelegatingTypeDescriptionProvider. The type is the /// type we will delegate to. /// internal DelegatingTypeDescriptionProvider(Type type) { _type = type; } ////// /// internal TypeDescriptionProvider Provider { get { return TypeDescriptor.GetProviderRecursive(_type); } } ////// This method is used to create an instance that can substitute for another /// data type. If the method is not interested in providing a substitute /// instance, it should call base. /// public override object CreateInstance(IServiceProvider provider, Type objectType, Type[] argTypes, object[] args) { return Provider.CreateInstance(provider, objectType, argTypes, args); } ////// TypeDescriptor may need to perform complex operations on collections of metadata. /// Since types are not unloaded for the life of a domain, TypeDescriptor will /// automatically cache the results of these operations based on type. There are a /// number of operations that use live object instances, however. These operations /// cannot be cached within TypeDescriptor because caching them would prevent the /// object from garbage collecting. Instead, TypeDescriptor allows for a per-object /// cache, accessed as an IDictionary of key/value pairs, to exist on an object. /// The GetCache method returns an instance of this cache. GetCache will return /// null if there is no supported cache for an object. /// public override IDictionary GetCache(object instance) { return Provider.GetCache(instance); } ////// The name of the specified component, or null if the component has no name. /// In many cases this will return the same value as GetComponentName. If the /// component resides in a nested container or has other nested semantics, it may /// return a different fully qualfied name. /// /// If not overridden, the default implementation of this method will call /// GetTypeDescriptor.GetComponentName. /// public override string GetFullComponentName(object component) { return Provider.GetFullComponentName(component); } ////// This method returns an extended custom type descriptor for the given object. /// An extended type descriptor is a custom type descriptor that offers properties /// that other objects have added to this object, but are not actually defined on /// the object. For example, in the .NET Framework Component Model, objects that /// implement the interface IExtenderProvider can "attach" properties to other /// objects that reside in the same logical container. The GetTypeDescriptor /// method does not return a type descriptor that provides these extra extended /// properties. GetExtendedTypeDescriptor returns the set of these extended /// properties. TypeDescriptor will automatically merge the results of these /// two property collections. Note that while the .NET Framework component /// model only supports extended properties this API can be used for extended /// attributes and events as well, if the type description provider supports it. /// public override ICustomTypeDescriptor GetExtendedTypeDescriptor(object instance) { return Provider.GetExtendedTypeDescriptor(instance); } protected internal override IExtenderProvider[] GetExtenderProviders(object instance) { return Provider.GetExtenderProviders(instance); } ////// The GetReflection method is a lower level version of GetTypeDescriptor. /// If no custom type descriptor can be located for an object, GetReflection /// is called to perform normal reflection against the object. /// public override Type GetReflectionType(Type objectType, object instance) { return Provider.GetReflectionType(objectType, instance); } public override Type GetRuntimeType(Type objectType) { return Provider.GetRuntimeType(objectType); } ////// This method returns a custom type descriptor for the given type / object. /// The objectType parameter is always valid, but the instance parameter may /// be null if no instance was passed to TypeDescriptor. The method should /// return a custom type descriptor for the object. If the method is not /// interested in providing type information for the object it should /// return null. /// public override ICustomTypeDescriptor GetTypeDescriptor(Type objectType, object instance) { return Provider.GetTypeDescriptor(objectType, instance); } public override bool IsSupportedType(Type type) { return Provider.IsSupportedType(type); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.ComponentModel { using System; using System.Collections; using System.Reflection; using System.Security.Permissions; ////// This is a simple type description provider that, when invoked demand /// locates the correct type description provider for the given type and /// invokes it. This is used as the tail node for both type and instance /// based providers. Conceptually it "links" the provider list for one type /// or instance to its corresponding base type. /// [HostProtection(SharedState = true)] internal sealed class DelegatingTypeDescriptionProvider : TypeDescriptionProvider { private Type _type; ////// Creates a new DelegatingTypeDescriptionProvider. The type is the /// type we will delegate to. /// internal DelegatingTypeDescriptionProvider(Type type) { _type = type; } ////// /// internal TypeDescriptionProvider Provider { get { return TypeDescriptor.GetProviderRecursive(_type); } } ////// This method is used to create an instance that can substitute for another /// data type. If the method is not interested in providing a substitute /// instance, it should call base. /// public override object CreateInstance(IServiceProvider provider, Type objectType, Type[] argTypes, object[] args) { return Provider.CreateInstance(provider, objectType, argTypes, args); } ////// TypeDescriptor may need to perform complex operations on collections of metadata. /// Since types are not unloaded for the life of a domain, TypeDescriptor will /// automatically cache the results of these operations based on type. There are a /// number of operations that use live object instances, however. These operations /// cannot be cached within TypeDescriptor because caching them would prevent the /// object from garbage collecting. Instead, TypeDescriptor allows for a per-object /// cache, accessed as an IDictionary of key/value pairs, to exist on an object. /// The GetCache method returns an instance of this cache. GetCache will return /// null if there is no supported cache for an object. /// public override IDictionary GetCache(object instance) { return Provider.GetCache(instance); } ////// The name of the specified component, or null if the component has no name. /// In many cases this will return the same value as GetComponentName. If the /// component resides in a nested container or has other nested semantics, it may /// return a different fully qualfied name. /// /// If not overridden, the default implementation of this method will call /// GetTypeDescriptor.GetComponentName. /// public override string GetFullComponentName(object component) { return Provider.GetFullComponentName(component); } ////// This method returns an extended custom type descriptor for the given object. /// An extended type descriptor is a custom type descriptor that offers properties /// that other objects have added to this object, but are not actually defined on /// the object. For example, in the .NET Framework Component Model, objects that /// implement the interface IExtenderProvider can "attach" properties to other /// objects that reside in the same logical container. The GetTypeDescriptor /// method does not return a type descriptor that provides these extra extended /// properties. GetExtendedTypeDescriptor returns the set of these extended /// properties. TypeDescriptor will automatically merge the results of these /// two property collections. Note that while the .NET Framework component /// model only supports extended properties this API can be used for extended /// attributes and events as well, if the type description provider supports it. /// public override ICustomTypeDescriptor GetExtendedTypeDescriptor(object instance) { return Provider.GetExtendedTypeDescriptor(instance); } protected internal override IExtenderProvider[] GetExtenderProviders(object instance) { return Provider.GetExtenderProviders(instance); } ////// The GetReflection method is a lower level version of GetTypeDescriptor. /// If no custom type descriptor can be located for an object, GetReflection /// is called to perform normal reflection against the object. /// public override Type GetReflectionType(Type objectType, object instance) { return Provider.GetReflectionType(objectType, instance); } public override Type GetRuntimeType(Type objectType) { return Provider.GetRuntimeType(objectType); } ////// This method returns a custom type descriptor for the given type / object. /// The objectType parameter is always valid, but the instance parameter may /// be null if no instance was passed to TypeDescriptor. The method should /// return a custom type descriptor for the object. If the method is not /// interested in providing type information for the object it should /// return null. /// public override ICustomTypeDescriptor GetTypeDescriptor(Type objectType, object instance) { return Provider.GetTypeDescriptor(objectType, instance); } public override bool IsSupportedType(Type type) { return Provider.IsSupportedType(type); } } } // 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
- PrePrepareMethodAttribute.cs
- StructuredTypeInfo.cs
- WebServiceHandlerFactory.cs
- XomlDesignerLoader.cs
- LinearGradientBrush.cs
- BordersPage.cs
- DragCompletedEventArgs.cs
- SoapMessage.cs
- LinqDataSourceView.cs
- BamlReader.cs
- SoapTypeAttribute.cs
- InstanceDataCollection.cs
- DataServiceQueryProvider.cs
- MimeParameters.cs
- MenuEventArgs.cs
- XDeferredAxisSource.cs
- FullTextState.cs
- PersonalizationProviderCollection.cs
- SecurityElement.cs
- UncommonField.cs
- CodeSubDirectory.cs
- WebBrowserBase.cs
- TrustManagerPromptUI.cs
- DSACryptoServiceProvider.cs
- PartitionedStream.cs
- AsyncPostBackErrorEventArgs.cs
- DrawingGroupDrawingContext.cs
- RichTextBox.cs
- PageCatalogPart.cs
- SchemaNames.cs
- XmlSchemaObjectCollection.cs
- RuntimeResourceSet.cs
- DriveNotFoundException.cs
- TraceSwitch.cs
- ObjectDataSourceEventArgs.cs
- SchemaNames.cs
- ButtonColumn.cs
- BlobPersonalizationState.cs
- ElapsedEventArgs.cs
- XpsFilter.cs
- TakeOrSkipQueryOperator.cs
- CaseInsensitiveHashCodeProvider.cs
- WebPartCloseVerb.cs
- RowsCopiedEventArgs.cs
- BufferedStream.cs
- ThreadAbortException.cs
- CqlParserHelpers.cs
- ZeroOpNode.cs
- DesignBindingValueUIHandler.cs
- _AutoWebProxyScriptEngine.cs
- ImageCodecInfoPrivate.cs
- ProxyGenerationError.cs
- PointCollectionConverter.cs
- SelectionChangedEventArgs.cs
- IncrementalHitTester.cs
- GridItemPattern.cs
- PngBitmapDecoder.cs
- VideoDrawing.cs
- DataGridViewHeaderCell.cs
- SizeAnimationClockResource.cs
- basemetadatamappingvisitor.cs
- Debug.cs
- AddInAttribute.cs
- CollectionConverter.cs
- ListBindableAttribute.cs
- SafeHandles.cs
- DockPatternIdentifiers.cs
- SessionIDManager.cs
- IOException.cs
- LocalBuilder.cs
- TextEndOfSegment.cs
- ImportOptions.cs
- XAMLParseException.cs
- HostProtectionException.cs
- SafeFileHandle.cs
- WebPartDescriptionCollection.cs
- NativeMethods.cs
- SafeNativeMethods.cs
- BigInt.cs
- OptimisticConcurrencyException.cs
- WsdlInspector.cs
- XamlPathDataSerializer.cs
- BasicExpandProvider.cs
- LambdaCompiler.Logical.cs
- ContainerParagraph.cs
- SqlUserDefinedAggregateAttribute.cs
- CategoryAttribute.cs
- TargetInvocationException.cs
- DataGridToolTip.cs
- Matrix.cs
- ConfigurationStrings.cs
- EventManager.cs
- CalendarKeyboardHelper.cs
- BrowsableAttribute.cs
- CompatibleIComparer.cs
- DriveInfo.cs
- EventRouteFactory.cs
- XmlDataDocument.cs
- ComplexTypeEmitter.cs
- XmlnsDictionary.cs