Code:
/ 4.0 / 4.0 / untmp / 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.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- CompModSwitches.cs
- CultureSpecificStringDictionary.cs
- ZipIOExtraField.cs
- ProviderBase.cs
- Number.cs
- GatewayDefinition.cs
- EntityConnectionStringBuilder.cs
- XmlUTF8TextReader.cs
- DoubleLinkList.cs
- User.cs
- EmbeddedMailObject.cs
- Pair.cs
- AspNetHostingPermission.cs
- NameSpaceExtractor.cs
- ResourceKey.cs
- X509ChainPolicy.cs
- TextEffectCollection.cs
- LocalValueEnumerator.cs
- RouteParser.cs
- Constraint.cs
- ColorMatrix.cs
- PropertyDescriptorComparer.cs
- BindingManagerDataErrorEventArgs.cs
- ProcessExitedException.cs
- EditorZoneBase.cs
- ServiceOperation.cs
- DataListItemEventArgs.cs
- WindowInteropHelper.cs
- DataBoundLiteralControl.cs
- TreeNodeCollection.cs
- RightsManagementErrorHandler.cs
- SoapExtensionImporter.cs
- CopyAction.cs
- StorageBasedPackageProperties.cs
- DataGridViewColumnEventArgs.cs
- ScrollChangedEventArgs.cs
- HitTestFilterBehavior.cs
- TypeListConverter.cs
- ButtonPopupAdapter.cs
- StyleHelper.cs
- ServiceOperation.cs
- TokenBasedSet.cs
- HtmlTableRow.cs
- EntityContainerEmitter.cs
- CalculatedColumn.cs
- BufferedWebEventProvider.cs
- altserialization.cs
- TreeNode.cs
- WebSysDisplayNameAttribute.cs
- DataGridViewComboBoxEditingControl.cs
- PeerApplicationLaunchInfo.cs
- SecurityAlgorithmSuite.cs
- FixedBufferAttribute.cs
- EntityTransaction.cs
- BmpBitmapDecoder.cs
- TableRowCollection.cs
- ActivityInterfaces.cs
- FormViewRow.cs
- PageStatePersister.cs
- XomlCompilerResults.cs
- PageHandlerFactory.cs
- DATA_BLOB.cs
- BaseTemplateCodeDomTreeGenerator.cs
- ExtendedProperty.cs
- WindowsRegion.cs
- CheckBox.cs
- FlowLayout.cs
- DataGridViewRowDividerDoubleClickEventArgs.cs
- Query.cs
- DialogResultConverter.cs
- DirectoryNotFoundException.cs
- InstancePersistenceContext.cs
- BoundPropertyEntry.cs
- ControlBindingsCollection.cs
- CacheOutputQuery.cs
- DeferredTextReference.cs
- HwndAppCommandInputProvider.cs
- Model3DCollection.cs
- IItemProperties.cs
- ViewManager.cs
- UnSafeCharBuffer.cs
- RemoteHelper.cs
- TableDetailsRow.cs
- SecurityHeaderTokenResolver.cs
- XmlILModule.cs
- GeneralTransform.cs
- PropertyTabChangedEvent.cs
- SqlDuplicator.cs
- ExpressionBuilder.cs
- OrCondition.cs
- CallSiteOps.cs
- WebScriptMetadataMessage.cs
- WindowsGraphics.cs
- TableCellAutomationPeer.cs
- IsolatedStorage.cs
- FormatException.cs
- TextLine.cs
- SerialPinChanges.cs
- FrameworkContentElement.cs
- ADMembershipUser.cs