Articolo
11/17/2011

Binding Class

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Defines a binding that connects the properties of binding targets and data sources.

Inheritance Hierarchy

System.Object
  System.Windows.Markup.MarkupExtension
    System.Windows.Data.BindingBase
      System.Windows.Data.Binding

Namespace: System.Windows.Data
Assembly: System.Windows (in System.Windows.dll)

Syntax

'Declaration
Public Class Binding _
    Inherits BindingBase _
    Implements ISupportInitialize

public class Binding : BindingBase, ISupportInitialize

<Binding .../>

See Remarks

The Binding type exposes the following members.

Constructors

	Name	Description
	Binding()	Initializes a new instance of the Binding class.
	Binding(Binding)	Initializes a new instance of the Binding class with initial property values copied from the specified Binding.
	Binding(String)	Initializes a new instance of the Binding class with an initial property path for the data source.

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Properties

	Name	Description
	BindsDirectlyToSource	Gets or sets a value that indicates whether the binding ignores any ICollectionView settings on the data source.
	Converter	Gets or sets the converter object that is called by the binding engine to modify the data as it is passed between the source and target, or vice versa.
	ConverterCulture	Gets or sets the culture to be used by the Converter.
	ConverterParameter	Gets or sets a parameter that can be used in the Converter logic.
	ElementName	Gets or sets the name of the element to use as the binding source object.
	FallbackValue	Gets or sets the value to use when the binding is unable to return a value. (Inherited from BindingBase.)
	Mode	Gets or sets a value that indicates the direction of the data flow in the binding.
	NotifyOnValidationError	Gets or sets a value that indicates whether the BindingValidationError event is raised on validation errors.
	Path	Gets or sets the path to the binding source property.
	RelativeSource	Gets or sets the binding source by specifying its location relative to the position of the binding target.
	Source	Gets or sets the data source for the binding.
	StringFormat	Gets or sets a string that specifies how to format the binding if it displays the bound value as a string. (Inherited from BindingBase.)
	TargetNullValue	Gets or sets the value that is used in the target when the value of the source is nulla null reference (Nothing in Visual Basic). (Inherited from BindingBase.)
	UpdateSourceTrigger	Gets or sets a value that determines the timing of binding source updates for two-way bindings.
	ValidatesOnDataErrors	Gets or sets a value that indicates whether the binding engine will report validation errors from an IDataErrorInfo implementation on the bound data entity.
	ValidatesOnExceptions	Gets or sets a value that indicates whether the binding engine will report exception validation errors.
	ValidatesOnNotifyDataErrors	Gets or sets a value that indicates whether the binding engine will report validation errors from an INotifyDataErrorInfo implementation on the bound data entity.

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Methods

	Name	Description
	CheckSealed	Throws an exception if the binding has already been attached to a binding target. (Inherited from BindingBase.)
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ProvideValue	Returns an object that should be set on the property where this binding and extension are applied. (Inherited from BindingBase.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Fields

	Name	Description
	IsDebuggingEnabled	Indicates whether data binding debugging is enabled.

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Explicit Interface Implementations

	Name	Description
	ISupportInitialize.BeginInit	Signals the object that initialization is starting.
	ISupportInitialize.EndInit	Signals the object that initialization is complete.

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Remarks

For XAML attribute usage for properties that can take a Binding, or that can otherwise be set to a data-bound value, see Binding Markup Extension. The Binding markup extension enables you to specify a Binding value as a single attribute string, including setting Binding properties such as Path and Source.

A Binding object connects a dependency property of a FrameworkElement directly to a data object so that updates to the data object are automatically propagated to the property. The Binding class defines the properties of a binding. Each binding must have a target element, target property, and data source, although some values are provided by default if you do not specify them.

To bind to a property or a subproperty on a data object, set the Path property of the Binding object. For more information, see Property Path Syntax.

You can apply an instance of a Binding class to multiple targets. However, you cannot modify the property values of a Binding object after you attach it to a target element.

Note:
Calling the FrameworkElement.SetBinding method and passing in a new Binding object will not necessarily remove an existing binding. Instead, you should use the DependencyObject.ClearValue method.

Examples

The following example code demonstrates how to use this class.

'Create the source string 
Dim s As String = "Hello"

'Create the binding description 
Dim b As New Binding("")
b.Mode = BindingMode.OneTime
b.Source = s

'Attach the binding to the target 
MyText.SetBinding(TextBlock.TextProperty, b)

//Create the source string
string s = "Hello";

//Create the binding description
Binding b = new Binding("");
b.Mode = BindingMode.OneTime;
b.Source = s;

//Attach the binding to the target
MyText.SetBinding(TextBlock.TextProperty, b);

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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