BindingOperations.GetBindingExpression Method
Definition
Important
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Returns the BindingExpression object associated with the specified binding target property on the specified object.
public:
static System::Windows::Data::BindingExpression ^ GetBindingExpression(System::Windows::DependencyObject ^ target, System::Windows::DependencyProperty ^ dp);public static System.Windows.Data.BindingExpression GetBindingExpression(System.Windows.DependencyObject target, System.Windows.DependencyProperty dp);static member GetBindingExpression : System.Windows.DependencyObject * System.Windows.DependencyProperty -> System.Windows.Data.BindingExpressionPublic Shared Function GetBindingExpression (target As DependencyObject, dp As DependencyProperty) As BindingExpressionParameters
- target
- DependencyObject
The binding target object where dp is.
The binding target property from which to retrieve the BindingExpression object.
Returns
The 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.
Exceptions
The target and dp parameters cannot be null.
Examples
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);
}
Private Sub OnRentRaise(ByVal sender As Object, ByVal args As RoutedEventArgs)
Dim _random As New System.Random()
Dim num1 As Double = _random.Next(10)
Dim expression1 As BindingExpression = BindingOperations.GetBindingExpression(Me.SavingsText, TextBlock.TextProperty)
Dim income1 As NetIncome = DirectCast(expression1.DataItem, NetIncome)
income1.Rent = CInt(((1 + (num1 / 100)) * income1.Rent))
End Sub
Remarks
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.
