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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
)

Parameters

dp
Type: System.Windows.DependencyProperty

The target DependencyProperty to get the binding from.

Return Value

Type: System.Windows.Data.BindingExpression
A BindingExpression if the target property has an active binding; otherwise, returns null.

Checking the return value for null 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.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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