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FrameworkElement.GetBindingExpression Method

Returns the BindingExpression that represents the binding on the specified property.

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

public BindingExpression GetBindingExpression (
	DependencyProperty dp
)
public BindingExpression GetBindingExpression (
	DependencyProperty dp
)
public function GetBindingExpression (
	dp : DependencyProperty
) : BindingExpression
You cannot use methods in XAML.

Parameters

dp

The target DependencyProperty to get the binding from.

Return Value

A BindingExpression if the target property has an active binding; otherwise, returns a null reference (Nothing in Visual Basic).

Checking the return value for a null reference (Nothing in Visual Basic) is a technique you can use to determine whether a property has an active binding.

This method is really just a convenience wrapper around the BindingOperations.GetBindingExpression method. GetBindingExpression passes the current instance and the dp parameter to BindingOperations.GetBindingExpression.

This example shows how to obtain the binding object from a data-bound target property.

You can do the following to get the Binding object:

// textBox3 is an instance of a TextBox
// the TextProperty is the data-bound dependency property
Binding myBinding = BindingOperations.GetBinding(textBox3, TextBox.TextProperty);

NoteNote:

You must specify the dependency property for the binding you want because it is possible that more than one property of the target object is using data binding.

Alternatively, you can get the BindingExpression and then get the value of the ParentBinding property.

For the complete example see Binding Validation Sample.

NoteNote:

If your binding is a MultiBinding, use BindingOperations.GetMultiBinding. If it is a PriorityBinding, use BindingOperations.GetPriorityBinding. If you are uncertain whether the target property is bound using a Binding, a MultiBinding, or a PriorityBinding, you can use BindingOperations.GetBindingBase.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0

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