BindingExpression Class


The .NET API Reference documentation has a new home. Visit the .NET API Browser on to see the new experience.

Contains information about a single instance of a Binding.

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


public sealed class BindingExpression : BindingExpressionBase, 


Gets the BindingGroup that this binding expression belongs to.(Inherited from BindingExpressionBase.)


Gets the binding source object that this BindingExpression uses.


Gets a value that indicates whether the parent binding has a failed validation rule.(Inherited from BindingExpressionBase.)


Gets a value that indicates whether the parent binding has a failed validation rule.(Inherited from BindingExpressionBase.)


Gets or sets a value that indicates whether the target of the binding has a value that has not been written to the source.(Inherited from BindingExpressionBase.)


Returns the Binding object of the current BindingExpression.


Gets the BindingBase object from which this BindingExpressionBase object is created.(Inherited from BindingExpressionBase.)


Gets the binding source object for this BindingExpression.


Gets the name of the binding source property for this BindingExpression.


Gets the status of the binding expression.(Inherited from BindingExpressionBase.)


Gets the element that is the binding target object of this binding expression.(Inherited from BindingExpressionBase.)


Gets the binding target property of this binding expression.(Inherited from BindingExpressionBase.)


Gets the ValidationError that caused this instance of BindingExpressionBase to be invalid.(Inherited from BindingExpressionBase.)


Gets a collection of ValidationError objects that caused this instance of BindingExpressionBase to be invalid.(Inherited from BindingExpressionBase.)


Determines whether the specified object is equal to the current object.(Inherited from Object.)


Serves as the default hash function. (Inherited from Object.)


Gets the Type of the current instance.(Inherited from Object.)


Returns a string that represents the current object.(Inherited from Object.)


Sends the current binding target value to the binding source property in TwoWay or OneWayToSource bindings.(Overrides BindingExpressionBase.UpdateSource().)


Forces a data transfer from the binding source property to the binding target property.(Overrides BindingExpressionBase.UpdateTarget().)


Runs any ValidationRule objects on the associated Binding that have the ValidationStep property set to RawProposedValue or ConvertedProposedValue. This method does not update the source.(Inherited from BindingExpressionBase.)

System_CAPS_pubinterfaceSystem_CAPS_privmethodIWeakEventListener.ReceiveWeakEvent(Type, Object, EventArgs)

This member supports the Windows Presentation Foundation (WPF) infrastructure and is not intended to be used directly from your code.

The Binding class is the high-level class for the declaration of a binding. The BindingExpression class is the underlying object that maintains the connection between the binding source and the binding target. A Binding contains all the information that can be shared across several BindingExpression objects. A BindingExpression is an instance expression that cannot be shared and that contains all the instance information about the Binding.

For example, consider the following, where myDataObject is an instance of the MyData class, myBinding is the source Binding object, and MyData class is a defined class that contains a string property named MyDataProperty. This example binds the text content of mytext, which is an instance of TextBlock, to MyDataProperty.

//make a new source
  MyData myDataObject = new MyData(DateTime.Now);      
  Binding myBinding = new Binding("MyDataProperty");
  myBinding.Source = myDataObject;
  myText.SetBinding(TextBlock.TextProperty, myBinding);

You can use the same myBinding object to create other bindings. For example, you might use the myBinding object to bind the text content of a check box to MyDataProperty. In that scenario, there will be two instances of BindingExpression that share the myBinding object.

You can obtain a BindingExpression object by using the GetBindingExpression method or the GetBindingExpression method on a data-bound object.

.NET Framework
Available since 3.0
Available since 3.0
Windows Phone Silverlight
Available since 7.0

Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Return to top