FrameworkElement.GetBindingExpression Method
Returns the BindingExpression that represents the binding on the specified property.
Assembly: PresentationFramework (in PresentationFramework.dll)
Parameters
- dp
- Type: System.Windows.DependencyProperty
The target DependencyProperty to get the binding from.
Return Value
Type: System.Windows.Data.BindingExpressionA 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);
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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.
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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 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
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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