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TypeDescriptionProvider Class

Provides supplemental metadata to the TypeDescriptor.

Namespace:  System.ComponentModel
Assembly:  System (in System.dll)

[HostProtectionAttribute(SecurityAction.LinkDemand, SharedState = true)]
public abstract class TypeDescriptionProvider

The TypeDescriptionProvider type exposes the following members.

Protected methodTypeDescriptionProvider()Initializes a new instance of the TypeDescriptionProvider class.
Protected methodTypeDescriptionProvider(TypeDescriptionProvider)Initializes a new instance of the TypeDescriptionProvider class using a parent type description provider.

Public methodCreateInstanceCreates an object that can substitute for another data type.
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetCacheGets a per-object cache, accessed as an IDictionary of key/value pairs.
Public methodGetExtendedTypeDescriptorGets an extended custom type descriptor for the given object.
Protected methodGetExtenderProvidersGets the extender providers for the specified object.
Public methodGetFullComponentNameGets the name of the specified component, or null if the component has no name.
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetReflectionType(Object)Performs normal reflection against the given object.
Public methodGetReflectionType(Type)Performs normal reflection against a type.
Public methodGetReflectionType(Type, Object)Performs normal reflection against the given object with the given type.
Public methodGetRuntimeTypeConverts a reflection type into a runtime type.
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodGetTypeDescriptor(Object)Gets a custom type descriptor for the given object.
Public methodGetTypeDescriptor(Type)Gets a custom type descriptor for the given type.
Public methodGetTypeDescriptor(Type, Object)Gets a custom type descriptor for the given type and object.
Public methodIsSupportedTypeGets a value that indicates whether the specified type is compatible with the type description and its chain of type description providers.
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)

The TypeDescriptionProvider class dynamically extends the type information associated with a type or object by adding, modifying, or hiding characteristics such as attributes, properties, and events. There can be multiple type description provider classes that offer metadata to a single TypeDescriptor.

There are two ways to associate a TypeDescriptionProvider with a TypeDescriptor:

The TypeDescriptionProvider class relies on a parent object of the same type, supplied during construction. This allows classes that derive from CustomTypeDescriptor to selectively override methods.

Instances of TypeDescriptionProvider are only built upon demand, minimizing the impact of custom type information on performance.

This class cannot be inherited.


The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: SharedState. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

Notes to Inheritors

Your derived type might be marked as internal or private, but an instance of your type can be created with the TypeDescriptor class. Do not write insecure code by assuming the caller is trusted. Assume instead that callers might create instances of your type in partial trust.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.