TypeDescriptor::AddProvider Method (TypeDescriptionProvider^, Object^)

.NET Framework (current version)

Adds a type description provider for a single instance of a component.

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

Syntax

public:
[PermissionSetAttribute(SecurityAction::LinkDemand, Name = "FullTrust")]
static void AddProvider(
	TypeDescriptionProvider^ provider,
	Object^ instance
)

Parameters

provider: Type: System.ComponentModel::TypeDescriptionProvider^
The TypeDescriptionProvider to add.

instance: Type: System::Object^
An instance of the target component.

Exceptions

Exception	Condition
ArgumentNullException	One or both of the parameters are null.

The AddProvider(TypeDescriptionProvider^, Object^) method adds a type description provider that supplies type information for a single instance of a component. If a provider is added by this method, the provider's CreateInstance method will not be called because the instance already exists.

This method does not maintain a hard reference to the component, so it does not prevent the component from finalizing.

It is possible to add multiple type description providers for the same type or object. If this occurs, the first type description provider encountered that provides type information will be used exclusively. Since type information providers are stored in a stack, the last provider added will be the first one queried. This behavior enables the AddProvider(TypeDescriptionProvider^, Object^) and RemoveProvider methods to be used to push and pop type description providers as required for particular scenarios.

If successful, this method calls the Refresh(Object^) method on the instance parameter.

Note
The two versions of this method produce results with different scopes. The AddProvider method that takes an Object parameter affects only that single instance of the component specified. In contrast, the other overload, which takes a Type parameter, affects all instances of the component described by that type.