PropertyChangedCallback Delegate

Reference

Definition

Namespace:: Windows.UI.Xaml

Important

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Represents the callback that is invoked when the effective property value of a dependency property changes.

public delegate void PropertyChangedCallback(DependencyObject ^ d, DependencyPropertyChangedEventArgs ^ e);

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.Guid(1520405029, 53570, 17572, 130, 49, 253, 103, 103, 36, 242, 155)]
class PropertyChangedCallback : MulticastDelegate

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.Guid(1520405029, 53570, 17572, 130, 49, 253, 103, 103, 36, 242, 155)]
public delegate void PropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e);

Public Delegate Sub PropertyChangedCallback(d As DependencyObject, e As DependencyPropertyChangedEventArgs)

Parameters

d: DependencyObject

The DependencyObject on which the property has changed value.

e: DependencyPropertyChangedEventArgs

Event data that is issued by any event that tracks changes to the effective value of this property.

Attributes: ContractVersionAttribute GuidAttribute

Windows requirements

Device family	Windows 10 (introduced in 10.0.10240.0)
API contract	Windows.Foundation.UniversalApiContract (introduced in v1.0)

Remarks

You implement callbacks based on this delegate to provide the property-changed behavior for a custom dependency property. You might use this callback to provide value constraints, or to initiate value changes in other properties that depend on the value of the property that is being changed. For more info see Custom dependency properties.

Applies to