Element Class

Reference

Definition

Namespace:: Xamarin.Forms

Assembly:: Xamarin.Forms.Core.dll

Important

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Provides the base class for all Xamarin.Forms hierarchal elements. This class contains all the methods and properties required to represent an element in the Xamarin.Forms hierarchy.

public abstract class Element : Xamarin.Forms.BindableObject, Xamarin.Forms.IElementController, Xamarin.Forms.Internals.INameScope

type Element = class
    inherit BindableObject
    interface INameScope
    interface IElementController

Inheritance: System.Object

BindableObject
Element

Derived: Xamarin.Forms.Application

Xamarin.Forms.AppLinkEntry

Xamarin.Forms.BaseMenuItem

Xamarin.Forms.Cell

Xamarin.Forms.FormattedString

More…

Implements: IElementController INameScope

Remarks

Important categories of visual elements are noted in the following table:

Class	Description
VisualElement	A Element that occupies an area on the screen, has a visual appearance, and can obtain touch input.
Cell	Cells are elements meant to be added to ListView or TableView.
Page	A VisualElement that occupies most or all of the screen and contains a single child.
Layout	Layout have a single child of type View, while subclasses of Layout<T> have a collection of multiple children views, including other layouts.
Controls and specialized Views	The lower part of the diagram shows the Xamarin.Forms classes for universally-available controls, such as Buttons and TableViews.

Constructors

Element()

Protected constructor used to initialize a the element.

Fields

AutomationIdProperty	The backing store for the AutomationId field.
ClassIdProperty	Identifies the ClassId bindable property.
MenuProperty	Backing store for the attached menu property.

Properties

AutomationId	Gets or sets a value that allows the automation framework to find and interact with this element.
BindingContext	Gets or sets object that contains the properties that will be targeted by the bound properties that belong to this BindableObject. (Inherited from BindableObject)
ClassId	Gets or sets a value used to identify a collection of semantically similar elements.
Dispatcher	(Inherited from BindableObject)
EffectControlProvider	For internal use by the Xamarin.Forms platform.
Effects	A list of the effects that are applied to this item.
Id	Gets a value that can be used to uniquely identify an element through the run of an application.
LogicalChildren	For internal use by the Xamarin.Forms platform.
Parent	Gets or sets the parent element of the element.
ParentView	Obsolete. Gets the element which is the closest ancestor of this element that is a VisualElement.
Platform
RealParent	For internal use by the Xamarin.Forms platform.
StyleId	Gets or sets a user defined value to uniquely identify the element.

Methods

ApplyBindings()	Apply the bindings to BindingContext. (Inherited from BindableObject)
ClearValue(BindableProperty)	Clears any value set by SetValue for `property`. (Inherited from BindableObject)
ClearValue(BindablePropertyKey)	Clears any value set by SetValue for the property that is identified by `propertyKey`. (Inherited from BindableObject)
CoerceValue(BindableProperty)	(Inherited from BindableObject)
CoerceValue(BindablePropertyKey)	(Inherited from BindableObject)
Descendants()	For internal use by the Xamarin.Forms platform.
EffectIsAttached(String)	For internal use by the Xamarin.Forms platform.
FindByName(String)	Returns the element that has the specified name.
GetMenu(BindableObject)	Gets the Menu object for `bindable`.
GetValue(BindableProperty)	Returns the value that is contained in the BindableProperty. (Inherited from BindableObject)
GetValues(BindableProperty, BindableProperty, BindableProperty)	Obsolete. For internal use by the Xamarin.Forms platform. (Inherited from BindableObject)
GetValues(BindableProperty, BindableProperty)	Obsolete. For internal use by the Xamarin.Forms platform. (Inherited from BindableObject)
IsSet(BindableProperty)	Returns `true` if the target property exists and has been set. (Inherited from BindableObject)
OnBindingContextChanged()	Invoked whenever the binding context of the element changes. Implement this method to add class handling for this event.
OnChildAdded(Element)	Invoked whenever the ChildAdded event needs to be emitted. Implement this method to add class handling for this event.
OnChildRemoved(Element, Int32)
OnChildRemoved(Element)	Obsolete. Invoked whenever the ChildRemoved event needs to be emitted. Implement this method to add class handling for this event.
OnParentSet()	Invoked whenever the Parent of an element is set. Implement this method in order to add behavior when the element is added to a parent.
OnPropertyChanged(String)	Method that is called when a bound property is changed.
OnPropertyChanging(String)	Call this method from a child class to notify that a change is going to happen on a property. (Inherited from BindableObject)
RemoveBinding(BindableProperty)	Removes a previously set binding. (Inherited from BindableObject)
RemoveDynamicResource(BindableProperty)	Removes a previously set dynamic resource
SetBinding(BindableProperty, BindingBase)	Assigns a binding to a property. (Inherited from BindableObject)
SetDynamicResource(BindableProperty, String)	Sets the BindableProperty property of this element to be updated via the DynamicResource with the provided key.
SetMenu(BindableObject, Menu)	Sets the menu for `bindable`.
SetValue(BindableProperty, Object)	Sets the value of the specified property. (Inherited from BindableObject)
SetValue(BindablePropertyKey, Object)	Sets the value of the propertyKey. (Inherited from BindableObject)
SetValueCore(BindableProperty, Object, SetValueFlags)	For internal use by the Xamarin.Forms platform. (Inherited from BindableObject)
SetValueFromRenderer(BindableProperty, Object)	For internal use by the Xamarin.Forms platform.
SetValueFromRenderer(BindablePropertyKey, Object)	For internal use by the Xamarin.Forms platform.
UnapplyBindings()	Unapplies all previously set bindings. (Inherited from BindableObject)

Events

BindingContextChanged	Raised whenever the BindingContext property changes. (Inherited from BindableObject)
ChildAdded	Occurs whenever a child element is added to the element.
ChildRemoved	Occurs whenever a child element is removed from the element.
DescendantAdded	Occurs whenever a child element is added to the elements subtree.
DescendantRemoved	Occurs whenever a child element is removed from the elements subtree.
PlatformSet
PropertyChanged	Raised when a property has changed. (Inherited from BindableObject)
PropertyChanging	Raised when a property is about to change. (Inherited from BindableObject)

Explicit Interface Implementations

IDynamicResourceHandler.SetDynamicResource(BindableProperty, String)	For internal use by the Xamarin.Forms platform. (Inherited from BindableObject)
IElementController.SetValueFromRenderer(BindableProperty, Object)	For internal use by the Xamarin.Forms platform.
INameScope.RegisterName(String, Object)	For internal use only.

Extension Methods

GetPropertyIfSet<T>(BindableObject, BindableProperty, T)
SetAppThemeColor(BindableObject, BindableProperty, Color, Color)
SetBinding(BindableObject, BindableProperty, String, BindingMode, IValueConverter, String)	Creates and applies a binding to a property.
SetBinding<TSource>(BindableObject, BindableProperty, Expression<Func<TSource,Object>>, BindingMode, IValueConverter, String)	Obsolete. Creates and applies a binding from an expression.
SetOnAppTheme<T>(BindableObject, BindableProperty, T, T)
FindByName<T>(Element, String)	Returns the instance of type `T` that has name `name` in the scope that includes `element`.

Applies to

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