Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / fx / src / CompMod / System / ComponentModel / TypeDescriptionProvider.cs / 1 / TypeDescriptionProvider.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.ComponentModel { using System; using System.Collections; using System.Reflection; using System.Security.Permissions; ////// The TypeDescriptionProvider class can be thought of as a "plug-in" for /// TypeDescriptor. There can be multiple type description provider classes /// all offering metadata to TypeDescriptor /// [HostProtection(SharedState = true)] public abstract class TypeDescriptionProvider { private TypeDescriptionProvider _parent; private EmptyCustomTypeDescriptor _emptyDescriptor; ////// There are two versions of the constructor for this class. The empty /// constructor is identical to using TypeDescriptionProvider(null). /// If a child type description provider is passed into the constructor, /// the "base" versions of all methods will call to this parent provider. /// If no such provider is given, the base versions of the methods will /// return empty, but valid values. /// protected TypeDescriptionProvider() { } ////// There are two versions of the constructor for this class. The empty /// constructor is identical to using TypeDescriptionProvider(null). /// If a child type description provider is passed into the constructor, /// the "base" versions of all methods will call to this parent provider. /// If no such provider is given, the base versions of the methods will /// return empty, but valid values. /// protected TypeDescriptionProvider(TypeDescriptionProvider parent) { _parent = parent; } ////// 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. /// /// This method is prototyped as virtual, and by default returns null if no /// parent provider was passed. If a parent provider was passed, this /// method will invoke the parent provider's CreateInstance method. /// public virtual object CreateInstance(IServiceProvider provider, Type objectType, Type[] argTypes, object[] args) { if (_parent != null) { return _parent.CreateInstance(provider, objectType, argTypes, args); } if (objectType == null) { throw new ArgumentNullException("objectType"); } return SecurityUtils.SecureCreateInstance(objectType, 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 virtual IDictionary GetCache(object instance) { if (_parent != null) { return _parent.GetCache(instance); } return null; } ////// 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 virtual ICustomTypeDescriptor GetExtendedTypeDescriptor(object instance) { if (_parent != null) { return _parent.GetExtendedTypeDescriptor(instance); } if (_emptyDescriptor == null) { _emptyDescriptor = new EmptyCustomTypeDescriptor(); } return _emptyDescriptor; } ////// 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 virtual string GetFullComponentName(object component) { if (_parent != null) { return _parent.GetFullComponentName(component); } return GetTypeDescriptor(component).GetComponentName(); } ////// The GetReflection method is a lower level version of GetTypeDescriptor. /// If no custom type descriptor can be located for an object, GetReflectionType /// is called to perform normal reflection against the object. /// public Type GetReflectionType(Type objectType) { return GetReflectionType(objectType, null); } ////// The GetReflection method is a lower level version of GetTypeDescriptor. /// If no custom type descriptor can be located for an object, GetReflectionType /// is called to perform normal reflection against the object. /// /// This method is prototyped as virtual, and by default returns the /// object type if no parent provider was passed. If a parent provider was passed, this /// method will invoke the parent provider's GetReflectionType method. /// public Type GetReflectionType(object instance) { if (instance == null) { throw new ArgumentNullException("instance"); } return GetReflectionType(instance.GetType(), instance); } ////// The GetReflection method is a lower level version of GetTypeDescriptor. /// If no custom type descriptor can be located for an object, GetReflectionType /// is called to perform normal reflection against the object. /// /// This method is prototyped as virtual, and by default returns the /// object type if no parent provider was passed. If a parent provider was passed, this /// method will invoke the parent provider's GetReflectionType method. /// public virtual Type GetReflectionType(Type objectType, object instance) { if (_parent != null) { return _parent.GetReflectionType(objectType, instance); } return 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 base. /// public ICustomTypeDescriptor GetTypeDescriptor(Type objectType) { return GetTypeDescriptor(objectType, null); } ////// 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 base. /// public ICustomTypeDescriptor GetTypeDescriptor(object instance) { if (instance == null) { throw new ArgumentNullException("instance"); } return GetTypeDescriptor(instance.GetType(), instance); } ////// 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 base. /// /// This method is prototyped as virtual, and by default returns a /// custom type descriptor that returns empty collections for all values /// if no parent provider was passed. If a parent provider was passed, /// this method will invoke the parent provider's GetTypeDescriptor /// method. /// public virtual ICustomTypeDescriptor GetTypeDescriptor(Type objectType, object instance) { if (_parent != null) { return _parent.GetTypeDescriptor(objectType, instance); } if (_emptyDescriptor == null) { _emptyDescriptor = new EmptyCustomTypeDescriptor(); } return _emptyDescriptor; } ////// A simple empty descriptor that is used as a placeholder for times /// when the user does not provide their own. /// private sealed class EmptyCustomTypeDescriptor : CustomTypeDescriptor { } } } // 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; ////// The TypeDescriptionProvider class can be thought of as a "plug-in" for /// TypeDescriptor. There can be multiple type description provider classes /// all offering metadata to TypeDescriptor /// [HostProtection(SharedState = true)] public abstract class TypeDescriptionProvider { private TypeDescriptionProvider _parent; private EmptyCustomTypeDescriptor _emptyDescriptor; ////// There are two versions of the constructor for this class. The empty /// constructor is identical to using TypeDescriptionProvider(null). /// If a child type description provider is passed into the constructor, /// the "base" versions of all methods will call to this parent provider. /// If no such provider is given, the base versions of the methods will /// return empty, but valid values. /// protected TypeDescriptionProvider() { } ////// There are two versions of the constructor for this class. The empty /// constructor is identical to using TypeDescriptionProvider(null). /// If a child type description provider is passed into the constructor, /// the "base" versions of all methods will call to this parent provider. /// If no such provider is given, the base versions of the methods will /// return empty, but valid values. /// protected TypeDescriptionProvider(TypeDescriptionProvider parent) { _parent = parent; } ////// 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. /// /// This method is prototyped as virtual, and by default returns null if no /// parent provider was passed. If a parent provider was passed, this /// method will invoke the parent provider's CreateInstance method. /// public virtual object CreateInstance(IServiceProvider provider, Type objectType, Type[] argTypes, object[] args) { if (_parent != null) { return _parent.CreateInstance(provider, objectType, argTypes, args); } if (objectType == null) { throw new ArgumentNullException("objectType"); } return SecurityUtils.SecureCreateInstance(objectType, 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 virtual IDictionary GetCache(object instance) { if (_parent != null) { return _parent.GetCache(instance); } return null; } ////// 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 virtual ICustomTypeDescriptor GetExtendedTypeDescriptor(object instance) { if (_parent != null) { return _parent.GetExtendedTypeDescriptor(instance); } if (_emptyDescriptor == null) { _emptyDescriptor = new EmptyCustomTypeDescriptor(); } return _emptyDescriptor; } ////// 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 virtual string GetFullComponentName(object component) { if (_parent != null) { return _parent.GetFullComponentName(component); } return GetTypeDescriptor(component).GetComponentName(); } ////// The GetReflection method is a lower level version of GetTypeDescriptor. /// If no custom type descriptor can be located for an object, GetReflectionType /// is called to perform normal reflection against the object. /// public Type GetReflectionType(Type objectType) { return GetReflectionType(objectType, null); } ////// The GetReflection method is a lower level version of GetTypeDescriptor. /// If no custom type descriptor can be located for an object, GetReflectionType /// is called to perform normal reflection against the object. /// /// This method is prototyped as virtual, and by default returns the /// object type if no parent provider was passed. If a parent provider was passed, this /// method will invoke the parent provider's GetReflectionType method. /// public Type GetReflectionType(object instance) { if (instance == null) { throw new ArgumentNullException("instance"); } return GetReflectionType(instance.GetType(), instance); } ////// The GetReflection method is a lower level version of GetTypeDescriptor. /// If no custom type descriptor can be located for an object, GetReflectionType /// is called to perform normal reflection against the object. /// /// This method is prototyped as virtual, and by default returns the /// object type if no parent provider was passed. If a parent provider was passed, this /// method will invoke the parent provider's GetReflectionType method. /// public virtual Type GetReflectionType(Type objectType, object instance) { if (_parent != null) { return _parent.GetReflectionType(objectType, instance); } return 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 base. /// public ICustomTypeDescriptor GetTypeDescriptor(Type objectType) { return GetTypeDescriptor(objectType, null); } ////// 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 base. /// public ICustomTypeDescriptor GetTypeDescriptor(object instance) { if (instance == null) { throw new ArgumentNullException("instance"); } return GetTypeDescriptor(instance.GetType(), instance); } ////// 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 base. /// /// This method is prototyped as virtual, and by default returns a /// custom type descriptor that returns empty collections for all values /// if no parent provider was passed. If a parent provider was passed, /// this method will invoke the parent provider's GetTypeDescriptor /// method. /// public virtual ICustomTypeDescriptor GetTypeDescriptor(Type objectType, object instance) { if (_parent != null) { return _parent.GetTypeDescriptor(objectType, instance); } if (_emptyDescriptor == null) { _emptyDescriptor = new EmptyCustomTypeDescriptor(); } return _emptyDescriptor; } ////// A simple empty descriptor that is used as a placeholder for times /// when the user does not provide their own. /// private sealed class EmptyCustomTypeDescriptor : CustomTypeDescriptor { } } } // 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
- HierarchicalDataBoundControl.cs
- UrlPropertyAttribute.cs
- XmlNamespaceMappingCollection.cs
- ColorConverter.cs
- IpcPort.cs
- RightsManagementEncryptionTransform.cs
- _NativeSSPI.cs
- MaterializeFromAtom.cs
- CodeTryCatchFinallyStatement.cs
- PhonemeEventArgs.cs
- ClientTargetCollection.cs
- HatchBrush.cs
- TransformProviderWrapper.cs
- DropShadowEffect.cs
- SourceInterpreter.cs
- RtType.cs
- BlobPersonalizationState.cs
- PageAsyncTask.cs
- EntityClassGenerator.cs
- TCPListener.cs
- UDPClient.cs
- XPathDocumentBuilder.cs
- GeometryGroup.cs
- XmlSchemaAttributeGroupRef.cs
- OuterGlowBitmapEffect.cs
- ParallelDesigner.cs
- XmlMemberMapping.cs
- Point3DCollection.cs
- DeferredElementTreeState.cs
- peersecurityelement.cs
- HotCommands.cs
- ProfessionalColorTable.cs
- MemoryFailPoint.cs
- NameSpaceEvent.cs
- DateTimeValueSerializerContext.cs
- Util.cs
- GridViewCancelEditEventArgs.cs
- SecurityPolicySection.cs
- InteropBitmapSource.cs
- XmlProcessingInstruction.cs
- XsltLibrary.cs
- State.cs
- PolicyReader.cs
- DocumentAutomationPeer.cs
- ZoneMembershipCondition.cs
- EdmMember.cs
- RTTrackingProfile.cs
- AutomationElementCollection.cs
- embossbitmapeffect.cs
- uribuilder.cs
- ImpersonationContext.cs
- GeneratedContractType.cs
- RegexTree.cs
- SizeConverter.cs
- FragmentNavigationEventArgs.cs
- UniqueTransportManagerRegistration.cs
- CounterCreationDataConverter.cs
- NamespaceMapping.cs
- EnumDataContract.cs
- TimeSpanOrInfiniteConverter.cs
- CustomAttribute.cs
- SapiInterop.cs
- CustomTypeDescriptor.cs
- PersonalizationStateQuery.cs
- ReadWriteObjectLock.cs
- ButtonChrome.cs
- Point3D.cs
- MessageSecurityException.cs
- ChildDocumentBlock.cs
- Privilege.cs
- DirectoryInfo.cs
- XmlDocumentViewSchema.cs
- SessionParameter.cs
- InvokeHandlers.cs
- WmiEventSink.cs
- LambdaCompiler.Unary.cs
- CheckBoxDesigner.cs
- FileDialog.cs
- DependencyObjectProvider.cs
- BrushMappingModeValidation.cs
- IdentitySection.cs
- Queue.cs
- EntityDataSourceEntityTypeFilterConverter.cs
- EntityDesignPluralizationHandler.cs
- DurableErrorHandler.cs
- LockedHandleGlyph.cs
- CodeTypeConstructor.cs
- MutableAssemblyCacheEntry.cs
- Timer.cs
- WebBaseEventKeyComparer.cs
- configsystem.cs
- Path.cs
- SqlExpander.cs
- ObjectReaderCompiler.cs
- Shape.cs
- Compensate.cs
- SafeHandles.cs
- SemanticAnalyzer.cs
- DocumentPageHost.cs
- NavigationEventArgs.cs