System.ComponentModel Namespace

The System.ComponentModel namespace provides classes that are used to implement the run-time and design-time behavior of components and controls. This namespace includes the base classes and interfaces for implementing attributes and type converters, binding to data sources, and licensing components.

The classes in this namespace divide into the following categories:

Core component classes. See the Component, IComponent, Container, and IContainer classes.
Component licensing. See the License, LicenseManager, LicenseProvider, and LicenseProviderAttribute classes.
Attributes. See the Attribute class.
Descriptors and persistence. See the TypeDescriptor, EventDescriptor, and PropertyDescriptor classes.
Type converters. See the TypeConverter class.

Classes

	Class	Description
	AddingNewEventArgs	Provides data for the BindingSource.AddingNew event.
	AmbientValueAttribute	Specifies the value to pass to a property to cause the property to get its value from another source. This is known as ambience. This class cannot be inherited.
	ArrayConverter	Provides a type converter to convert Array objects to and from various other representations.
	AsyncCompletedEventArgs	Provides data for the MethodNameCompleted event.
	AsyncOperation	Tracks the lifetime of an asynchronous operation.
	AsyncOperationManager	Provides concurrency management for classes that support asynchronous method calls. This class cannot be inherited.
	AttributeCollection	Represents a collection of attributes.
	AttributeProviderAttribute	Enables attribute redirection. This class cannot be inherited.
	BackgroundWorker	Executes an operation on a separate thread.
	BaseNumberConverter	Provides a base type converter for nonfloating-point numerical types.
	BindableAttribute	Specifies whether a member is typically used for binding. This class cannot be inherited.
	BindingList	Provides a generic collection that supports data binding.
	BooleanConverter	Provides a type converter to convert Boolean objects to and from various other representations.
	BrowsableAttribute	Specifies whether a property or event should be displayed in a Properties window.
	ByteConverter	Provides a type converter to convert 8-bit unsigned integer objects to and from various other representations.
	CancelEventArgs	Provides data for a cancelable event.
	CategoryAttribute	Specifies the name of the category in which to group the property or event when displayed in a PropertyGrid control set to Categorized mode.
	CharConverter	Provides a type converter to convert Unicode character objects to and from various other representations.
	CollectionChangeEventArgs	Provides data for the CollectionChanged event.
	CollectionConverter	Provides a type converter to convert collection objects to and from various other representations.
	ComplexBindingPropertiesAttribute	Specifies the data source and data member properties for a component that supports complex data binding. This class cannot be inherited.
	Component	Provides the base implementation for the IComponent interface and enables object sharing between applications.
	ComponentCollection	Provides a read-only container for a collection of IComponent objects.
	ComponentConverter	Provides a type converter to convert components to and from various other representations.
	ComponentEditor	Provides the base class for a custom component editor.
	ComponentResourceManager	Provides simple functionality for enumerating resources for a component or object. The ComponentResourceManager class is a ResourceManager.
	Container	Encapsulates zero or more components.
	ContainerFilterService	Provides a base class for the container filter service.
	CultureInfoConverter	Provides a type converter to convert CultureInfo objects to and from various other representations.
	CurrentChangedEventManager	Provides a WeakEventManager implementation so that you can use the "weak event listener" pattern to attach listeners for the CurrentChanged event.
	CurrentChangingEventArgs	Provides information for the CurrentChanging event.
	CurrentChangingEventManager	Provides a WeakEventManager implementation so that you can use the "weak event listener" pattern to attach listeners for the CurrentChanging event.
	CustomTypeDescriptor	Provides a simple default implementation of the ICustomTypeDescriptor interface.
	DataObjectAttribute	Identifies a type as an object suitable for binding to an ObjectDataSource object. This class cannot be inherited.
	DataObjectFieldAttribute	Provides metadata for a property representing a data field. This class cannot be inherited.
	DataObjectMethodAttribute	Identifies a data operation method exposed by a type, what type of operation the method performs, and whether the method is the default data method. This class cannot be inherited.
	DateTimeConverter	Provides a type converter to convert DateTime objects to and from various other representations.
	DecimalConverter	Provides a type converter to convert Decimal objects to and from various other representations.
	DefaultBindingPropertyAttribute	Specifies the default binding property for a component. This class cannot be inherited.
	DefaultEventAttribute	Specifies the default event for a component.
	DefaultPropertyAttribute	Specifies the default property for a component.
	DefaultValueAttribute	Specifies the default value for a property.
	DependencyPropertyDescriptor	Provides an extension of PropertyDescriptor that accounts for the additional property characteristics of a dependency property.
	DescriptionAttribute	Specifies a description for a property or event.
	DesignerAttribute	Specifies the class used to implement design-time services for a component.
	DesignerCategoryAttribute	Specifies that the designer for a class belongs to a certain category.
	DesignerProperties	Provides attached properties used to communicate with a designer.
	DesignerSerializationVisibilityAttribute	Specifies the type of persistence to use when serializing a property on a component at design time.
	DesignOnlyAttribute	Specifies whether a property can only be set at design time.
	DesignTimeVisibleAttribute	DesignTimeVisibleAttribute marks a component's visibility. If Yes is present, a visual designer can show this component on a designer.
	DisplayNameAttribute	Specifies the display name for a property, event, or public void method which takes no arguments.
	DoubleConverter	Provides a type converter to convert double-precision, floating point number objects to and from various other representations.
	DoWorkEventArgs	Provides data for the DoWork event handler.
	EditorAttribute	Specifies the editor to use to change a property. This class cannot be inherited.
	EditorBrowsableAttribute	Specifies that a property or method is viewable in an editor. This class cannot be inherited.
	EnumConverter	Provides a type converter to convert Enum objects to and from various other representations.
	EventDescriptor	Provides information about an event.
	EventDescriptorCollection	Represents a collection of EventDescriptor objects.
	EventHandlerList	Provides a simple list of delegates. This class cannot be inherited.
	ExpandableObjectConverter	Provides a type converter to convert expandable objects to and from various other representations.
	ExtenderProvidedPropertyAttribute	Specifies a property that is offered by an extender provider. This class cannot be inherited.
	GroupDescription	Provides an abstract base class for types that describe how to divide the items in a collection into groups.
	GuidConverter	Provides a type converter to convert Guid objects to and from various other representations.
	HandledEventArgs	Provides data for events that can be handled completely in an event handler.
	ImmutableObjectAttribute	Specifies that an object has no subproperties capable of being edited. This class cannot be inherited.
	InheritanceAttribute	Indicates whether the component associated with this attribute has been inherited from a base class. This class cannot be inherited.
	InitializationEventAttribute	Specifies which event is raised on initialization. This class cannot be inherited.
	InstallerTypeAttribute	Specifies the installer for a type that installs components.
	InstanceCreationEditor	Creates an instance of a particular type of property from a drop-down box within the PropertyGrid.
	Int16Converter	Provides a type converter to convert 16-bit signed integer objects to and from other representations.
	Int32Converter	Provides a type converter to convert 32-bit signed integer objects to and from other representations.
	Int64Converter	Provides a type converter to convert 64-bit signed integer objects to and from various other representations.
	InvalidAsynchronousStateException	Thrown when a thread on which an operation should execute no longer exists or has no message loop.
	InvalidEnumArgumentException	The exception thrown when using invalid arguments that are enumerators.
	License	Provides the abstract base class for all licenses. A license is granted to a specific instance of a component.
	LicenseContext	Specifies when you can use a licensed object and provides a way of obtaining additional services needed to support licenses running within its domain.
	LicenseException	Represents the exception thrown when a component cannot be granted a license.
	LicenseManager	Provides properties and methods to add a license to a component and to manage a LicenseProvider. This class cannot be inherited.
	LicenseProvider	Provides the abstract base class for implementing a license provider.
	LicenseProviderAttribute	Specifies the LicenseProvider to use with a class. This class cannot be inherited.
	LicFileLicenseProvider	Provides an implementation of a LicenseProvider. The provider works in a similar fashion to the Microsoft .NET Framework standard licensing model.
	ListBindableAttribute	Specifies that a list can be used as a data source. A visual designer should use this attribute to determine whether to display a particular list in a data-binding picker. This class cannot be inherited.
	ListChangedEventArgs	Provides data for the ListChanged event.
	ListSortDescription	Provides a description of the sort operation applied to a data source.
	ListSortDescriptionCollection	Represents a collection of ListSortDescription objects.
	LocalizableAttribute	Specifies whether a property should be localized. This class cannot be inherited.
	LookupBindingPropertiesAttribute	Specifies the properties that support lookup-based binding. This class cannot be inherited.
	MarshalByValueComponent	Implements IComponent and provides the base implementation for remotable components that are marshaled by value (a copy of the serialized object is passed).
	MaskedTextProvider	Represents a mask-parsing service that can be used by any number of controls that support masking, such as the MaskedTextBox control.
	MemberDescriptor	Represents a class member, such as a property or event. This is an abstract base class.
	MergablePropertyAttribute	Specifies that this property can be combined with properties belonging to other objects in a Properties window.
	MultilineStringConverter	Provides a type converter to convert multiline strings to a simple string.
	NestedContainer	Provides the base implementation for the INestedContainer interface, which enables containers to have an owning component.
	NotifyParentPropertyAttribute	Indicates that the parent property is notified when the value of the property that this attribute is applied to is modified. This class cannot be inherited.
	NullableConverter	Provides automatic conversion between a nullable type and its underlying primitive type.
	ParenthesizePropertyNameAttribute	Indicates whether the name of the associated property is displayed with parentheses in the Properties window. This class cannot be inherited.
	PasswordPropertyTextAttribute	Indicates that an object's text representation is obscured by characters such as asterisks. This class cannot be inherited.
	ProgressChangedEventArgs	Provides data for the ProgressChanged event.
	PropertyChangedEventArgs	Provides data for the PropertyChanged event.
	PropertyChangedEventManager	Provides a WeakEventManager implementation so that you can use the "weak event listener" pattern to attach listeners for the PropertyChanged event.
	PropertyDescriptor	Provides an abstraction of a property on a class.
	PropertyDescriptorCollection	Represents a collection of PropertyDescriptor objects.
	PropertyFilterAttribute	Specifies which properties should be reported by type descriptors, specifically the GetProperties method.
	PropertyTabAttribute	Identifies the property tab or tabs to display for the specified class or classes.
	ProvidePropertyAttribute	Specifies the name of the property that an implementer of IExtenderProvider offers to other components. This class cannot be inherited
	ReadOnlyAttribute	Specifies whether the property this attribute is bound to is read-only or read/write at design time. This class cannot be inherited
	RecommendedAsConfigurableAttribute	Specifies that the property can be used as an application setting.
	ReferenceConverter	Provides a type converter to convert object references to and from other representations.
	RefreshEventArgs	Provides data for the Refreshed event.
	RefreshPropertiesAttribute	Indicates that the property grid should refresh when the associated property value changes. This class cannot be inherited.
	RunInstallerAttribute	Specifies whether the Visual Studio Custom Action Installer or the Installer Tool (Installutil.exe) should be invoked when the assembly is installed.
	RunWorkerCompletedEventArgs	Provides data for the MethodNameCompleted event.
	SByteConverter	Provides a type converter to convert 8-bit unsigned integer objects to and from a string.
	SettingsBindableAttribute	Specifies when a component property can be bound to an application setting.
	SingleConverter	Provides a type converter to convert single-precision, floating point number objects to and from various other representations.
	SortDescriptionCollection	Represents a collection of SortDescription objects.
	StringConverter	Provides a type converter to convert string objects to and from other representations.
	SyntaxCheck	Provides methods to verify the machine name and path conform to a specific syntax. This class cannot be inherited.
	TimeSpanConverter	Provides a type converter to convert TimeSpan objects to and from other representations.
	ToolboxItemAttribute	Represents an attribute of a toolbox item.
	ToolboxItemFilterAttribute	Specifies the filter string and filter type to use for a toolbox item.
	TypeConverter	Provides a unified way of converting types of values to other types, as well as for accessing standard values and subproperties.
	TypeConverter.SimplePropertyDescriptor	Represents an abstract class that provides properties for objects that do not have properties.
	TypeConverter.StandardValuesCollection	Represents a collection of values.
	TypeConverterAttribute	Specifies what type to use as a converter for the object this attribute is bound to. This class cannot be inherited.
	TypeDescriptionProvider	Provides supplemental metadata to the TypeDescriptor.
	TypeDescriptionProviderAttribute	Specifies the custom type description provider for a class. This class cannot be inherited.
	TypeDescriptor	Provides information about the characteristics for a component, such as its attributes, properties, and events. This class cannot be inherited.
	TypeListConverter	Provides a type converter that can be used to populate a list box with available types.
	UInt16Converter	Provides a type converter to convert 16-bit unsigned integer objects to and from other representations.
	UInt32Converter	Provides a type converter to convert 32-bit unsigned integer objects to and from various other representations.
	UInt64Converter	Provides a type converter to convert 64-bit unsigned integer objects to and from other representations.
	WarningException	Specifies an exception that is handled as a warning instead of an error.
	Win32Exception	Throws an exception for a Win32 error code.

Interfaces

	Interface	Description
	IBindingList	Provides the features required to support both complex and simple scenarios when binding to a data source.
	IBindingListView	Extends the IBindingList interface by providing advanced sorting and filtering capabilities.
	ICancelAddNew	Adds transactional capability when adding a new item to a collection.
	IChangeTracking	Defines the mechanism for querying the object for changes and resetting of the changed status.
	ICollectionView	Enables collections to have the functionalities of current record management, custom sorting, filtering, and grouping.
	ICollectionViewFactory	An interface that enables implementing collections to create a view to their data. Normally, user code does not call methods on this interface.
	IComNativeDescriptorHandler	Top level mapping layer between a COM object and TypeDescriptor.
	IComponent	Provides functionality required by all components.
	IContainer	Provides functionality for containers. Containers are objects that logically contain zero or more components.
	ICustomTypeDescriptor	Provides an interface that supplies dynamic custom type information for an object.
	IDataErrorInfo	Provides the functionality to offer custom error information that a user interface can bind to.
	IEditableObject	Provides functionality to commit or rollback changes to an object that is used as a data source.
	IExtenderProvider	Defines the interface for extending properties to other components in a container.
	IIntellisenseBuilder	Provides an interface to facilitate the retrieval of the builder's name and to display the builder.
	IListSource	Provides functionality to an object to return a list that can be bound to a data source.
	INestedContainer	Provides functionality for nested containers, which logically contain zero or more other components and are owned by a parent component.
	INestedSite	Provides the ability to retrieve the full nested name of a component.
	INotifyPropertyChanged	Notifies clients that a property value has changed.
	IRaiseItemChangedEvents	Indicates whether a class converts property change events to ListChanged events.
	IRevertibleChangeTracking	Provides support for rolling back the changes
	ISite	Provides functionality required by sites.
	ISupportInitialize	Specifies that this object supports a simple, transacted notification for batch initialization.
	ISupportInitializeNotification	Allows coordination of initialization for a component and its dependent properties.
	ISynchronizeInvoke	Provides a way to synchronously or asynchronously execute a delegate.
	ITypeDescriptorContext	Provides contextual information about a component, such as its container and property descriptor.
	ITypedList	Provides functionality to discover the schema for a bindable list, where the properties available for binding differ from the public properties of the object to bind to.

Structures

	Structure	Description
	SortDescription	Defines the direction and the property name to be used as the criteria for sorting a collection.

Delegates

	Delegate	Description
	AddingNewEventHandler	Represents the method that will handle the BindingSource.AddingNew event.
	AsyncCompletedEventHandler	Represents the method that will handle the MethodNameCompleted event of an asynchronous operation.
	CancelEventHandler	Represents the method that handles a cancelable event.
	CollectionChangeEventHandler	Represents the method that handles the CollectionChanged event raised when adding elements to or removing elements from a collection.
	CurrentChangingEventHandler	Represents the method that handles the CurrentChanging event.
	DoWorkEventHandler	Represents the method that will handle the DoWork event. This class cannot be inherited.
	HandledEventHandler	Represents a method that can handle events which may or may not require further processing after the event handler has returned.
	ListChangedEventHandler	Represents the method that will handle the ListChanged event of the IBindingList class.
	ProgressChangedEventHandler	Represents the method that will handle the ProgressChanged event of the BackgroundWorker class. This class cannot be inherited.
	PropertyChangedEventHandler	Represents the method that will handle the PropertyChanged event raised when a property is changed on a component.
	RefreshEventHandler	Represents the method that handles the Refreshed event raised when a Type or component is changed during design time.
	RunWorkerCompletedEventHandler	Represents the method that will handle the RunWorkerCompleted event of a BackgroundWorker class.

Enumerations

	Enumeration	Description
	BindableSupport	Specifies values to indicate whether a property can be bound to a data element or another property.
	BindingDirection	Specifies whether the template can be bound one way or two ways.
	CollectionChangeAction	Specifies how the collection is changed.
	DataObjectMethodType	Identifies the type of data operation performed by a method, as specified by the DataObjectMethodAttribute applied to the method.
	DesignerSerializationVisibility	Specifies the visibility a property has to the design-time serializer.
	EditorBrowsableState	Specifies the browsable state of a property or method from within an editor.
	InheritanceLevel	Defines identifiers for types of inheritance levels.
	LicenseUsageMode	Specifies when the License can be used.
	ListChangedType	Specifies how the list changed.
	ListSortDirection	Specifies the direction of a sort operation.
	MaskedTextResultHint	Specifies values that succinctly describe the results of a masked text parsing operation.
	PropertyFilterOptions	Specifies which properties should be reported by type descriptors, specifically the GetProperties method. This enumeration is used to specify the value of the PropertyFilterAttribute.Filter property.
	PropertyTabScope	Defines identifiers that indicate the persistence scope of a tab in the Properties window.
	RefreshProperties	Defines identifiers that indicate the type of a refresh of the Properties window.
	ToolboxItemFilterType	Defines identifiers used to indicate the type of filter that a ToolboxItemFilterAttribute uses.