Style Class

Definition

Namespace:

System.Windows

Assembly:

PresentationFramework.dll

Enables the sharing of properties, resources, and event handlers between instances of a type.

public ref class Style : System::Windows::Threading::DispatcherObject, System::Windows::Markup::IAddChild, System::Windows::Markup::INameScope, System::Windows::Markup::IQueryAmbient

[System.Windows.Localizability(System.Windows.LocalizationCategory.Ignore)]
[System.Windows.Markup.ContentProperty("Setters")]
[System.Windows.Markup.DictionaryKeyProperty("TargetType")]
public class Style : System.Windows.Threading.DispatcherObject, System.Windows.Markup.IAddChild, System.Windows.Markup.INameScope, System.Windows.Markup.IQueryAmbient

[<System.Windows.Localizability(System.Windows.LocalizationCategory.Ignore)>]
[<System.Windows.Markup.ContentProperty("Setters")>]
[<System.Windows.Markup.DictionaryKeyProperty("TargetType")>]
type Style = class
    inherit DispatcherObject
    interface IAddChild
    interface INameScope
    interface IQueryAmbient

Public Class Style
Inherits DispatcherObject
Implements IAddChild, INameScope, IQueryAmbient

Inheritance

Object

DispatcherObject

Style

Attributes

LocalizabilityAttribute ContentPropertyAttribute DictionaryKeyPropertyAttribute

Implements

IAddChild INameScope IQueryAmbient

Examples

The following example shows a style declaration that will affect the Background property of a Control.

<Style x:Key="Style1">
  <Setter Property="Control.Background" Value="Yellow"/>
</Style>

To apply the above style, do the following:

<Label Content="Yellow Background" Style="{StaticResource Style1}" />

You can also apply styles to all elements of a given type by using the TargetType property. Adding the target type to the style means that you no longer have to fully qualify the property you are setting with the ClassName.PropertyName syntax. The following example defines a style that will be applied to every TextBlock element.

<Style TargetType="{x:Type TextBlock}">
  <Setter Property="FontFamily" Value="Segoe Black" />
  <Setter Property="HorizontalAlignment" Value="Center" />
  <Setter Property="FontSize" Value="12pt" />
  <Setter Property="Foreground" Value="#777777" />
</Style>

Note

Many WPF controls consist of a combination of other WPF controls, so creating a style that applies to all controls of a type can have broad impact. For instance, if you create a style that targets the TextBlock controls in a Canvas, the style is applied to all TextBlock controls in the canvas, even if the TextBlock is part of another control, such as a ListBox.

For information on how to extend or inherit from a defined style, see the BasedOn page.

Remarks

You can set a Style on any element that derives from FrameworkElement or FrameworkContentElement. A style is most commonly declared as a resource inside the Resources section. Because styles are resources, they obey the same scoping rules that apply to all resources, so where you declare a style affects where it can be applied. If, for instance, you declare the style in the root element of your application definition XAML file, the style can be used anywhere in your application. If you are creating a navigation application and declare the style in one of the application's XAML files, the style can be used only in that XAML file. For more information on scoping rules for resources, see XAML Resources.

The style declaration consists of a Style object that contains a collection of one or more Setter objects. Each Setter consists of a Property and a Value. The property is the name of the property of the element the style is to apply to. After the style is declared as a resource, it can then be referenced just like any other resource.

Note

If there is more than one setter in the setter collection with the same Property property value, the setter that is declared last is used. Similarly, if you set a value for the same property in a style and on an element directly, the value set on the element directly takes precedence.

The Windows Presentation Foundation (WPF) styling and templating model allows maintenance and sharing of a look as well as the separation of presentation and logic. The styling and templating model includes a suite of features that enable you to customize your UI. This suite of features includes the Style class as well as the following:

• Trigger

• EventTrigger and Storyboard

• ControlTemplate

• DataTemplate

For more information, see Styling and Templating.

Constructors

Style()	Initializes a new instance of the Style class.
Style(Type, Style)	Initializes a new instance of the Style class to use on the specified Type and based on the specified Style.
Style(Type)	Initializes a new instance of the Style class to use on the specified Type.

Properties

BasedOn	Gets or sets a defined style that is the basis of the current style.
Dispatcher	Gets the Dispatcher this DispatcherObject is associated with. (Inherited from DispatcherObject)
IsSealed	Gets a value that indicates whether the style is read-only and cannot be changed.
Resources	Gets or sets the collection of resources that can be used within the scope of this style.
Setters	Gets a collection of Setter and EventSetter objects.
TargetType	Gets or sets the type for which this style is intended.
Triggers	Gets a collection of TriggerBase objects that apply property values based on specified conditions.

Methods

CheckAccess()	Determines whether the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject)
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetHashCode()	Returns the hash code for this Style.
GetType()	Gets the Type of the current instance. (Inherited from Object)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
RegisterName(String, Object)	Registers a new name-object pair in the current namescope.
Seal()	Locks this style and all factories and triggers so they cannot be changed.
ToString()	Returns a string that represents the current object. (Inherited from Object)
UnregisterName(String)	Removes a name-object mapping from the namescope.
VerifyAccess()	Enforces that the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject)

Explicit Interface Implementations

IAddChild.AddChild(Object)	Adds a child object.
IAddChild.AddText(String)	Adds the text content of a node to the object.
INameScope.FindName(String)	Returns an object that has the provided identifying name.
IQueryAmbient.IsAmbientPropertyAvailable(String)	Queries whether a specified ambient property is available in the current scope.

See also

• x:Key Attribute
• x:Type Markup Extension