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
- TitleStyle.cs
- PolygonHotSpot.cs
- UiaCoreProviderApi.cs
- XamlClipboardData.cs
- DeploymentSection.cs
- ArrayWithOffset.cs
- X509CertificateTrustedIssuerElement.cs
- HtmlInputCheckBox.cs
- MediaElementAutomationPeer.cs
- EntityDesignerDataSourceView.cs
- BufferedStream.cs
- DirectoryObjectSecurity.cs
- IODescriptionAttribute.cs
- BoolExpression.cs
- HtmlInputImage.cs
- httpserverutility.cs
- URL.cs
- HtmlInputReset.cs
- ProxyWebPartConnectionCollection.cs
- SqlWebEventProvider.cs
- WaitForChangedResult.cs
- DatagridviewDisplayedBandsData.cs
- PageAdapter.cs
- DataSourceCacheDurationConverter.cs
- HandlerBase.cs
- NavigationPropertyEmitter.cs
- CqlLexerHelpers.cs
- StreamingContext.cs
- COM2EnumConverter.cs
- CompModSwitches.cs
- SqlXmlStorage.cs
- QuestionEventArgs.cs
- TrustLevel.cs
- CompModHelpers.cs
- Group.cs
- CodeDirectoryCompiler.cs
- TextServicesCompartment.cs
- HandlerMappingMemo.cs
- AffineTransform3D.cs
- XmlUrlEditor.cs
- EntityDataSourceDataSelectionPanel.cs
- VariableQuery.cs
- DbConnectionPoolGroup.cs
- WindowsToolbarAsMenu.cs
- BreakRecordTable.cs
- Vars.cs
- TypeUsageBuilder.cs
- ListParaClient.cs
- DeferrableContentConverter.cs
- EntityDataSourceWrapper.cs
- AuthorizationRuleCollection.cs
- SchemaNamespaceManager.cs
- CodeGroup.cs
- GB18030Encoding.cs
- GridEntryCollection.cs
- SortQuery.cs
- Int64KeyFrameCollection.cs
- HMAC.cs
- unsafenativemethodsother.cs
- ClickablePoint.cs
- SessionState.cs
- RadioButtonList.cs
- SqlClientFactory.cs
- SwitchElementsCollection.cs
- IISUnsafeMethods.cs
- DataBoundLiteralControl.cs
- IDictionary.cs
- DataSourceView.cs
- MailDefinitionBodyFileNameEditor.cs
- GridProviderWrapper.cs
- LiteralControl.cs
- NonSerializedAttribute.cs
- ToggleButton.cs
- ProtectedProviderSettings.cs
- DataServiceClientException.cs
- PathSegment.cs
- Brush.cs
- ScriptControlManager.cs
- ClientSideQueueItem.cs
- DbDataAdapter.cs
- GuidConverter.cs
- DeferredTextReference.cs
- TextElementEditingBehaviorAttribute.cs
- PeerCredentialElement.cs
- IgnorePropertiesAttribute.cs
- dtdvalidator.cs
- HostingEnvironmentException.cs
- ExpressionSelection.cs
- ContractHandle.cs
- LiteralDesigner.cs
- ProcessInputEventArgs.cs
- MimeMultiPart.cs
- Simplifier.cs
- X509ScopedServiceCertificateElement.cs
- OleDbDataReader.cs
- UidManager.cs
- MatrixConverter.cs
- MarginCollapsingState.cs
- BinaryEditor.cs
- CustomAssemblyResolver.cs