BindingOperations.GetBindingExpression Method
Returns the BindingExpression object associated with the specified binding target property on the specified object.
Namespace: System.Windows.Data
Assembly: PresentationFramework (in PresentationFramework.dll)
public static BindingExpression GetBindingExpression( DependencyObject target, DependencyProperty dp )
Parameters
- target
- Type: System.Windows.DependencyObject
The binding target object where dp is.
- dp
- Type: System.Windows.DependencyProperty
The binding target property from which to retrieve the BindingExpression object.
Return Value
Type: System.Windows.Data.BindingExpressionThe BindingExpression object associated with the given property or null if none exists. If a PriorityBindingExpression object is set on the property, the ActiveBindingExpression is returned.
| Exception | Condition |
|---|---|
| ArgumentNullException | The target and dp parameters cannot be null. |
The BindingExpression object maintains the connection between the binding source and the binding target. You can obtain the BindingExpression object by calling this static method or by calling the GetBindingExpression method on a data-bound FrameworkElement or FrameworkContentElement object.
The following example shows the implementation of a Click event handler that uses the GetBindingExpression method to obtain the BindingExpression and then calls the DataItem property to access the binding source object.
The TextBlock SavingsText is the binding target object and Text is the binding target property.
private void OnRentRaise(Object sender, RoutedEventArgs args) { // Update bills System.Random random = new System.Random(); double i = random.Next(10); BindingExpression bindingExpression = BindingOperations.GetBindingExpression(SavingsText, TextBlock.TextProperty); SDKSample.NetIncome sourceData = (SDKSample.NetIncome) bindingExpression.DataItem; sourceData.Rent = (int)((1 + i / 100) * (double)sourceData.Rent); }
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.
