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Binding.UpdateSourceTrigger Property

Gets or sets a value that determines the timing of binding source updates for two-way bindings.

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

'Declaration
Public Property UpdateSourceTrigger As UpdateSourceTrigger
<Binding UpdateSourceTrigger="updateSourceTriggerMemberName"/>

Property Value

Type: System.Windows.Data.UpdateSourceTrigger
A value that determines when the binding source is updated. The default is Default.

ExceptionCondition
InvalidOperationException

The Binding has already been attached to a target element, and cannot be modified.

Set this property to Explicit on two-way bindings to disable automatic updates to the binding source. This is useful when you want to perform validation on binding targets before any value changes are copied to the binding source. To update the binding source, use the FrameworkElement.GetBindingExpression method to retrieve a BindingExpression for the target property, and then call the UpdateSource method.

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

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

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

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