System.Windows Namespace

Provides several important Windows Presentation Foundation (WPF) base element classes, various classes that support the WPF property system and event logic, and other types that are more broadly consumed by the WPF core and framework.

Classes

Application	Encapsulates a Windows Presentation Foundation application.
AttachedPropertyBrowsableAttribute	Provides a base class for .NET attributes that report the use scope of attached properties.
AttachedPropertyBrowsableForChildrenAttribute	Specifies that an attached property has a browsable scope that extends to child elements in the logical tree.
AttachedPropertyBrowsableForTypeAttribute	Specifies that an attached property is browsable only for elements that derive from a specified type.
AttachedPropertyBrowsableWhenAttributePresentAttribute	Specifies that an attached property is only browsable on an element that also has another specific .NET attribute applied to its class definition.
AutoResizedEventArgs	Provides data for the AutoResized event raised by HwndSource.
BaseCompatibilityPreferences	Contains properties that specify how an application should behave relative to new WPF features that are in the WindowsBase assembly.
Clipboard	Provides static methods that facilitate transferring data to and from the system Clipboard.
ColorConvertedBitmapExtension	Implements a markup extension that enables ColorConvertedBitmap creation. A ColorConvertedBitmap does not have an embedded profile, the profile instead being based on source and destination values.
ComponentResourceKey	Defines or references resource keys based on class names in external assemblies, as well as an additional identifier.
Condition	Represents a condition for the MultiTrigger and the MultiDataTrigger, which apply changes to property values based on a set of conditions.
ConditionCollection	Represents a collection of Condition objects.
ContentElement	Provides a WPF core-level base class for content elements. Content elements are designed for flow-style presentation, using an intuitive markup-oriented layout model and a deliberately simple object model.
ContentOperations	Provides static utility methods for getting or setting the position of a ContentElement in an element tree.
CoreCompatibilityPreferences	Contains properties that specify how an application should behave relative to WPF features that are in the PresentationCore assembly.
CornerRadiusConverter	Converts instances of other types to and from a CornerRadius.
CultureInfoIetfLanguageTagConverter	Converts instances of CultureInfo to and from other data types.
DataFormat	Represents a data format by using a format name and numeric ID.
DataFormats	Provides a set of predefined data format names that can be used to identify data formats available in the clipboard or drag-and-drop operations.
DataObject	Provides a basic implementation of the IDataObject interface, which defines a format-independent mechanism for transferring data.
DataObjectCopyingEventArgs	Arguments for the DataObject.Copying event.
DataObjectEventArgs	Provides an abstract base class for events associated with the DataObject class.
DataObjectPastingEventArgs	Contains arguments for the DataObject.Pasting event.
DataObjectSettingDataEventArgs	Contains arguments for the DataObject.SettingData event.
DataTemplate	Describes the visual structure of a data object.
DataTemplateKey	Represents the resource key for the DataTemplate class.
DataTrigger	Represents a trigger that applies property values or performs actions when the bound data meets a specified condition.
DeferrableContent	Represents deferrable content that is held within BAML as a stream.
DeferrableContentConverter	Converts a stream to a DeferrableContent instance.
DependencyObject	Represents an object that participates in the dependency property system.
DependencyObjectType	Implements an underlying type cache for all DependencyObject derived types.
DependencyProperty	Represents a property that can be set through methods such as, styling, data binding, animation, and inheritance.
DependencyPropertyHelper	Provides a single helper method (GetValueSource(DependencyObject, DependencyProperty)) that reports the property system source for the effective value of a dependency property.
DependencyPropertyKey	Provides a dependency property identifier for limited write access to a read-only dependency property.
DialogResultConverter	Converts the DialogResult property, which is a Nullable<T> value of type Boolean, to and from other types.
DpiChangedEventArgs	This class passes necessary information to any listener of the DpiChangedEvent event, such as when a window is moved to a monitor with different DPI, or the DPI of the current monitor changes.
DragDrop	Provides helper methods and fields for initiating drag-and-drop operations, including a method to begin a drag-and-drop operation, and facilities for adding and removing drag-and-drop related event handlers.
DragEventArgs	Contains arguments relevant to all drag-and-drop events (DragEnter, DragLeave, DragOver, and Drop).
DurationConverter	Converts instances of Duration to and from other type representations.
DynamicResourceExtension	Implements a markup extension that supports dynamic resource references made from XAML.
DynamicResourceExtensionConverter	Converts from parsed XAML to DynamicResourceExtension and supports dynamic resource references made from XAML.
EventManager	Provides event-related utility methods that register routed events for class owners and add class handlers.
EventPrivateKey	Provides unique identification for events whose handlers are stored into an internal hashtable.
EventRoute	Represents the container for the route to be followed by a routed event.
EventSetter	Represents an event setter in a style. Event setters invoke the specified event handlers in response to events.
EventTrigger	Represents a trigger that applies a set of actions in response to an event.
ExceptionRoutedEventArgs	Provides data for the Image and MediaElement failed events.
ExitEventArgs	Event arguments for the Exit event.
Expression	This type supports the Windows Presentation Foundation (WPF) infrastructure and is not intended to be used directly from your code.
ExpressionConverter	Converts instances of Expression to and from other types.
FigureLengthConverter	Converts instances of other types to and from a FigureLength.
FontSizeConverter	Converts font size values to and from other type representations.
FontStretchConverter	Converts instances of FontStretch to and from other type representations.
FontStretches	Provides a set of static predefined FontStretch values.
FontStyleConverter	Converts instances of FontStyle to and from other data types.
FontStyles	Provides a set of static predefined FontStyle values.
FontWeightConverter	Converts instances of FontWeight to and from other data types.
FontWeights	Provides a set of static predefined FontWeight values.
FrameworkCompatibilityPreferences	Contains properties that specify how an application should behave relative to WPF features that are in the PresentationFramework assembly.
FrameworkContentElement	FrameworkContentElement is the WPF framework-level implementation and expansion of the ContentElement base class. FrameworkContentElement adds support for additional input APIs (including tooltips and context menus), storyboards, data context for data binding, styles support, and logical tree helper APIs.
FrameworkElement	Provides a WPF framework-level set of properties, events, and methods for Windows Presentation Foundation (WPF) elements. This class represents the provided WPF framework-level implementation that is built on the WPF core-level APIs that are defined by UIElement.
FrameworkElementFactory	Supports the creation of templates.
FrameworkPropertyMetadata	Reports or applies metadata for a dependency property, specifically adding framework-specific property system characteristics.
FrameworkTemplate	Enables the instantiation of a tree of FrameworkElement and/or FrameworkContentElement objects.
Freezable	Defines an object that has a modifiable state and a read-only (frozen) state. Classes that derive from Freezable provide detailed change notification, can be made immutable, and can clone themselves.
FreezableCollection<T>	Represents a collection of DependencyObject, Freezable, or Animatable objects. FreezableCollection<T> is itself an Animatable type.
GiveFeedbackEventArgs	Contains arguments for the GiveFeedback event.
GridLengthConverter	Converts instances of other types to and from GridLength instances.
HierarchicalDataTemplate	Represents a DataTemplate that supports HeaderedItemsControl, such as TreeViewItem or MenuItem.
HwndDpiChangedEventArgs	Represents a type of HandledEventArgs that is relevant to a DpiChanged event.
Int32RectConverter	Converts instances of other types to and from an Int32Rect.
KeySplineConverter	Converts instances of other types to and from a KeySpline.
KeyTimeConverter	Converts instances of KeyTime to and from other types.
LengthConverter	Converts instances of other types to and from instances of a Double that represent an object's length.
LocalizabilityAttribute	Specifies the localization attributes for a binary XAML (BAML) class or class member.
Localization	The Localization class defines attached properties for localization attributes and comments.
LogicalTreeHelper	Provides static helper methods for querying objects in the logical tree.
LostFocusEventManager	Provides a WeakEventManager implementation so that you can use the "weak event listener" pattern to attach listeners for the LostFocus or LostFocus events.
MediaScriptCommandRoutedEventArgs	Provides data for the ScriptCommand and ScriptCommand events.
MessageBox	Displays a message box.
MultiDataTrigger	Represents a trigger that applies property values or performs actions when the bound data meet a set of conditions.
MultiTrigger	Represents a trigger that applies property values or performs actions when a set of conditions are satisfied.
NameScope	Implements base WPF support for the INameScope methods that store or retrieve name-object mappings into a particular XAML namescope. Adds attached property support to make it simpler to get or set XAML namescope names dynamically at the element level.
NullableBoolConverter	Converts to and from the Nullable<T> type (using the Boolean type constraint on the generic).
PointConverter	Converts instances of other types to and from a Point.
PresentationSource	Provides an abstract base for classes that present content from another technology as part of an interoperation scenario. In addition, this class provides static methods for working with these sources, as well as the basic visual-layer presentation architecture.
PropertyMetadata	Defines certain behavior aspects of a dependency property as it is applied to a specific type, including conditions it was registered with.
PropertyPath	Implements a data structure for describing a property as a path below another property, or below an owning type. Property paths are used in data binding to objects, and in storyboards and timelines for animations.
PropertyPathConverter	Provides a type converter for PropertyPath objects.
QueryContinueDragEventArgs	Contains arguments for the QueryContinueDrag event.
RectConverter	Converts instances of other types to and from instances of Rect.
RequestBringIntoViewEventArgs	Provides data for the RequestBringIntoView routed event.
ResourceDictionary	Provides a hash table / dictionary implementation that contains WPF resources used by components and other elements of a WPF application.
ResourceKey	Provides an abstract base class for various resource keys.
ResourceReferenceKeyNotFoundException	The exception that is thrown when a resource reference key cannot be found during parsing or serialization of markup extension resources.
RoutedEvent	Represents and identifies a routed event and declares its characteristics.
RoutedEventArgs	Contains state information and event data associated with a routed event.
RoutedPropertyChangedEventArgs<T>	Provides data about a change in value to a dependency property as reported by particular routed events, including the previous and current value of the property that changed.
SessionEndingCancelEventArgs	Contains the event arguments for the SessionEnding event.
Setter	Represents a setter that applies a property value.
SetterBase	Represents the base class for value setters.
SetterBaseCollection	Represents a collection of SetterBase objects.
SizeChangedEventArgs	Provides data related to the SizeChanged event.
SizeChangedInfo	Report the specifics of a value change involving a Size. This is used as a parameter in OnRenderSizeChanged(SizeChangedInfo) overrides.
SizeConverter	Converts instances of other types to and from instances of the Size class.
SourceChangedEventArgs	Provides data for the SourceChanged event, used for interoperation. This class cannot be inherited.
SplashScreen	Provides a startup screen for a Windows Presentation Foundation (WPF) application.
StartupEventArgs	Contains the arguments for the Startup event.
StaticResourceExtension	Implements a markup extension that supports static (XAML load time) resource references made from XAML.
StrokeCollectionConverter	Converts a StrokeCollection to a string.
Style	Enables the sharing of properties, resources, and event handlers between instances of a type.
StyleTypedPropertyAttribute	Represents an attribute that is applied to the class definition and determines the TargetTypes of the properties that are of type Style.
SystemColors	Contains system colors, system brushes, and system resource keys that correspond to system display elements.
SystemCommands	Defines routed commands that are common to window management.
SystemFonts	Contains properties that expose the system resources that concern fonts.
SystemParameters	Contains properties that you can use to query system settings.
TemplateBindingExpression	Describes a run-time instance of a TemplateBindingExtension.
TemplateBindingExpressionConverter	A type converter that is used to construct a markup extension from a TemplateBindingExpression instance during serialization.
TemplateBindingExtension	Implements a markup extension that supports the binding between the value of a property in a template and the value of some other exposed property on the templated control.
TemplateBindingExtensionConverter	A type converter that is used to construct a TemplateBindingExtension from an instance during serialization.
TemplateContent	Implements the record and playback logic that templates use for deferring content when they interact with XAML readers and writers.
TemplateContentLoader	Implements XamlDeferringLoader in order to defer loading of the XAML content that is defined for a template in WPF XAML.
TemplateKey	When used as a resource key for a data template, allows the data template to participate in the lookup process.
TemplatePartAttribute	Represents an attribute that is applied to the class definition to identify the types of the named parts that are used for templating.
TemplateVisualStateAttribute	Specifies that a control can be in a certain state and that a VisualState is expected in the control's ControlTemplate.
TextDecoration	Represents a text decoration, which a visual ornamentation that is added to text (such as an underline).
TextDecorationCollection	Represents a collection of TextDecoration instances.
TextDecorationCollectionConverter	Converts instances of TextDecorationCollection from other data types.
TextDecorations	Provides a set of static predefined text decorations.
ThemeDictionaryExtension	Implements a markup extension that enables application authors to customize control styles based on the current system theme.
ThemeInfoAttribute	Specifies the location in which theme dictionaries are stored for an assembly.
ThemeModeConverter	Converts instances of other types to and from ThemeMode instances.
ThicknessConverter	Converts instances of other types to and from instances of Thickness.
Trigger	Represents a trigger that applies property values or performs actions conditionally.
TriggerAction	Describes an action to perform for a trigger.
TriggerActionCollection	Represents a collection of TriggerAction objects.
TriggerBase	Represents the base class for specifying a conditional value within a Style object.
TriggerCollection	Represents a collection of TriggerBase objects.
UIElement	UIElement is a base class for WPF core level implementations building on Windows Presentation Foundation (WPF) elements and basic presentation characteristics.
UIElement3D	UIElement3D is a base class for WPF core level implementations building on Windows Presentation Foundation (WPF) elements and basic presentation characteristics.
UIPropertyMetadata	Provides property metadata for non-framework properties that do have rendering/user interface impact at the core level.
VectorConverter	Converts instances of other types to and from a Vector.
VisualState	Represents the visual appearance of the control when it is in a specific state.
VisualStateChangedEventArgs	Provides data for the CurrentStateChanging and CurrentStateChanged events.
VisualStateGroup	Contains mutually exclusive VisualState objects and VisualTransition objects that are used to move from one state to another.
VisualStateManager	Manages states and the logic for transitioning between states for controls.
VisualTransition	Represents the visual behavior that occurs when a control transitions from one state to another.
WeakEventManager	Provides a base class for the event manager that is used in the weak event pattern. The manager adds and removes listeners for events (or callbacks) that also use the pattern.
WeakEventManager.ListenerList	Provides a built-in collection list for storing listeners for a WeakEventManager.
WeakEventManager<TEventSource,TEventArgs>	Provides a type-safe WeakEventManager that enables you to specify the event handler to use for the "weak event listener" pattern. This class defines a type parameter for the source of the event and a type parameter for the event data that is used.
WeakEventManager.ListenerList<TEventArgs>	Provides a type-safe collection list for storing listeners for a WeakEventManager. This class defines a type parameter for the event data that is used.
Window	Provides the ability to create, configure, show, and manage the lifetime of windows and dialog boxes.
WindowCollection	Represents a collection of Window objects. This class cannot be inherited.

Structs

CornerRadius	Represents the radiuses of a rectangle's corners.
DependencyPropertyChangedEventArgs	Provides data for various property changed events. Typically these events report effective value changes in the value of a read-only dependency property. Another usage is as part of a PropertyChangedCallback implementation.
DpiScale	Stores DPI information from which a Visual or UIElement is rendered.
Duration	Represents the duration of time that a Timeline is active.
FigureLength	Describes the height or width of a Figure.
FontStretch	Describes the degree to which a font has been stretched compared to the normal aspect ratio of that font.
FontStyle	Defines a structure that represents the style of a font face as normal, italic, or oblique.
FontWeight	Refers to the density of a typeface, in terms of the lightness or heaviness of the strokes.
FreezableCollection<T>.Enumerator	Enumerates the members of a FreezableCollection<T>.
GridLength	Represents the length of elements that explicitly support Star unit types.
Int32Rect	Describes the width, height, and location of an integer rectangle.
LocalValueEntry	Represents a property identifier and the property value for a locally set dependency property.
LocalValueEnumerator	Provides enumeration support for the local values of any dependency properties that exist on a DependencyObject.
Point	Represents an x- and y-coordinate pair in two-dimensional space.
Rect	Describes the width, height, and location of a rectangle.
RoutedEventHandlerInfo	Provides special handling information to inform event listeners whether specific handlers should be invoked.
Size	Implements a structure that is used to describe the Size of an object.
TextDecorationCollection.Enumerator	Enumerates TextDecoration items in a TextDecoration.
ThemeMode	Describes the Fluent theme mode to apply to an application or window.
Thickness	Describes the thickness of a frame around a rectangle. Four Double values describe the Left, Top, Right, and Bottom sides of the rectangle, respectively.
ValueSource	Reports the information returned from GetValueSource(DependencyObject, DependencyProperty).
Vector	Represents a displacement in 2-D space.

Interfaces

IContentHost	This interface is implemented by layouts which host ContentElement.
IDataObject	Provides a format-independent mechanism for transferring data.
IFrameworkInputElement	Declares a namescope contract for framework elements.
IInputElement	Establishes the common events and also the event-related properties and methods for basic input processing by Windows Presentation Foundation (WPF) elements.
IWeakEventListener	Provides event listening support for classes that expect to receive events through the WeakEvent pattern and a WeakEventManager.

Enums

BaseCompatibilityPreferences.HandleDispatcherRequestProcessingFailureOptions	Provides a set of values that describes how the dispatcher responds to failures that are encountered while requesting processing.
BaselineAlignment	Describes how the baseline for a text-based element is positioned on the vertical axis, relative to the established baseline for text.
BaseValueSource	Identifies the property system source of a particular dependency property value.
ColumnSpaceDistribution	Describes how to distribute space in columnated flow content.
DragAction	Specifies how and if a drag-and-drop operation should continue.
DragDropEffects	Specifies the effects of a drag-and-drop operation.
DragDropKeyStates	Specifies the current state of the modifier keys (SHIFT, CTRL, and ALT), as well as the state of the mouse buttons.
FigureHorizontalAnchor	Describes a position reference for a figure in a horizontal direction.
FigureUnitType	Describes the unit type associated with the width or height of a FigureLength.
FigureVerticalAnchor	Describes the point of reference of a figure in the vertical direction.
FlowDirection	Defines constants that specify the content flow direction for text and user interface (UI) elements.
FontCapitals	Describes the capital letter style for a Typography object.
FontEastAsianLanguage	Provides a mechanism for the user to select font-specific versions of glyphs for a specified East Asian writing system or language.
FontEastAsianWidths	Provides a mechanism for the user to select glyphs of different width styles.
FontFraction	Describes the fraction style for a Typography object.
FontNumeralAlignment	Describes the numeral alignment for a Typography object.
FontNumeralStyle	Describes the numeral style for a Typography object.
FontVariants	Renders variant typographic glyph forms.
FrameworkPropertyMetadataOptions	Specifies the types of framework-level property behavior that pertain to a particular dependency property in the Windows Presentation Foundation (WPF) property system.
GridUnitType	Describes the kind of value that a GridLength object is holding.
HorizontalAlignment	Indicates where an element should be displayed on the horizontal axis relative to the allocated layout slot of the parent element.
InheritanceBehavior	Indicates the current mode of lookup for property value inheritance, resource lookup, and RelativeSource FindAncestor lookup. A RelativeSource FindAncestor lookup occurs when a binding uses a RelativeSource that has its Mode property set to the FindAncestor value.
LineBreakCondition	Describes the breaking condition around an inline object.
LineStackingStrategy	Describes a mechanism by which a line box is determined for each line.
LocalizationCategory	Specifies the category value of a LocalizabilityAttribute for a binary XAML (BAML) class or class member.
MessageBoxButton	Specifies the buttons that are displayed on a message box. Used as an argument of the Show method.
MessageBoxImage	Specifies the icon that is displayed by a message box.
MessageBoxOptions	Specifies special display options for a message box.
MessageBoxResult	Specifies which message box button that a user clicks. MessageBoxResult is returned by the Show method.
Modifiability	Specifies the modifiability value of a LocalizabilityAttribute for a binary XAML (BAML) class or class member.
PowerLineStatus	Indicates whether the system power is online, or that the system power status is unknown.
Readability	Specifies the readability value of a LocalizabilityAttribute for a binary XAML (BAML) class or class member.
ReasonSessionEnding	Specifies the reason for which the user's session is ending. Used by the ReasonSessionEnding property.
ResizeMode	Specifies whether a window can be resized and, if so, how it can be resized. Used by the ResizeMode property.
ResourceDictionaryLocation	Specifies the locations where theme resource dictionaries are located.
RoutingStrategy	Indicates the routing strategy of a routed event.
ShutdownMode	Specifies how an application will shutdown. Used by the ShutdownMode property.
SizeToContent	Specifies how a window will automatically size itself to fit the size of its content. Used by the SizeToContent property.
TemplateKey.TemplateType	Describes the different types of templates that use TemplateKey.
TextAlignment	Specifies whether the text in the object is left-aligned, right-aligned, centered, or justified.
TextDataFormat	Specifies the data format of the text data.
TextDecorationLocation	Specifies the vertical position of a TextDecoration object.
TextDecorationUnit	Specifies the unit type of either a TextDecorationPenOffset or a Pen thickness value.
TextMarkerStyle	Describes the appearance of a list item's bullet style.
TextTrimming	Describes how text is trimmed when it overflows the edge of its containing box.
TextWrapping	Specifies whether text wraps when it reaches the edge of the containing box.
VerticalAlignment	Describes how a child element is vertically positioned or stretched within a parent's layout slot.
Visibility	Specifies the display state of an element.
WindowStartupLocation	Specifies the position that a Window will be shown in when it is first opened. Used by the WindowStartupLocation property.
WindowState	Specifies whether a window is minimized, maximized, or restored. Used by the WindowState property.
WindowStyle	Specifies the type of border that a Window has. Used by the WindowStyle property.
WrapDirection	Specifies the allowable directions that content can wrap around an object.

Delegates

AutoResizedEventHandler	Represents the method that will handle the AutoResized event raised by HwndSource.
CoerceValueCallback	Provides a template for a method that is called whenever a dependency property value is being re-evaluated, or coercion is specifically requested.
DataObjectCopyingEventHandler	Represents a method that will handle the Copying attached event.
DataObjectPastingEventHandler	Represents a method that will handle the Pasting attached event.
DataObjectSettingDataEventHandler	Represents a method that will handle the SettingData attached event.
DependencyPropertyChangedEventHandler	Represents the method that will handle events raised when a DependencyProperty is changed on a particular DependencyObject implementation.
DpiChangedEventHandler	Represents a method that will handle DpiChangedEventArgs.
DragEventHandler	Represents a method that will handle drag-and-drop routed events, for example DragEnter.
ExitEventHandler	Represents the method that handles the Exit event.
GiveFeedbackEventHandler	Represents a method that will handle the feedback routed event from in-process drag-and-drop operations, for instance GiveFeedback.
HwndDpiChangedEventHandler	The delegate to use for handlers that receive DPI change notification.
PropertyChangedCallback	Represents the callback that is invoked when the effective property value of a dependency property changes.
QueryContinueDragEventHandler	Represents a method that will handle the routed events that enables a drag-and-drop operation to be canceled by the drag source, for example QueryContinueDrag.
RequestBringIntoViewEventHandler	Represents the method that will handle the RequestBringIntoView routed event.
RoutedEventHandler	Represents the method that will handle various routed events that do not have specific event data beyond the data that is common for all routed events.
RoutedPropertyChangedEventHandler<T>	Represents methods that will handle various routed events that track property value changes.
SessionEndingCancelEventHandler	Represents the method that handles the SessionEnding event.
SizeChangedEventHandler	Represents the method that will handle the SizeChanged routed event.
SourceChangedEventHandler	Represents the method that will handle the "SourceChanged" event on specific listener elements.
StartupEventHandler	Represents the method that handles the Startup event.
ValidateValueCallback	Represents a method used as a callback that validates the effective value of a dependency property.