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FrameworkElement.GetBindingExpression Method

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Retrieves the BindingExpression for a dependency property where a binding is established.

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

'宣告
Public Function GetBindingExpression ( _
	dp As DependencyProperty _
) As BindingExpression

Parameters

dp
Type: System.Windows.DependencyProperty
The dependency property identifier for the specific property on this FrameworkElement where you want to obtain the BindingExpression.

Return Value

Type: System.Windows.Data.BindingExpression
A BindingExpression for the binding, if the local value represented a data-bound value. May return Nothing if the property is not a data-bound value.

In the current implementation, this method returns the same result as ReadLocalValue, with the return value cast to BindingExpression.

You could potentially use GetBindingExpression as a test to see whether a given dependency property has a binding applied to it, by attempting the cast of the return value to BindingExpression. If this succeeds, the property is currently being set by a data-bound value. If the value is Nothing rather than a BindingExpression, then the property you queried is not data-bound.

A BindingExpression object enables the following scenarios with its API:

For more information, see BindingExpression or Data binding for Windows Phone 8.

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

顯示: