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BindingExpression Class

Contains information about a single binding within a Binding object.

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

public sealed class BindingExpression : BindingExpressionBase

The BindingExpression type exposes the following members.

  NameDescription
Public propertySupported by Silverlight for Windows PhoneDataItemGets the binding source object that this BindingExpression uses.
Public propertySupported by Silverlight for Windows PhoneParentBindingReturns the Binding object of the current BindingExpression.
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  NameDescription
Public methodSupported by Silverlight for Windows PhoneEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodSupported by Silverlight for Windows PhoneFinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodSupported by Silverlight for Windows PhoneMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneToStringReturns a string that represents the current object. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneUpdateSourceSends the current binding target value to the binding source property in TwoWay bindings.
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A Binding object can be used by multiple binding targets. The BindingExpression class, however, represents a single binding. You can retrieve a BindingExpression instance from a binding target by calling its FrameworkElement.GetBindingExpression method. You can then use the BindingExpression to call the UpdateSource method. This is useful to control when values are copied from the binding target to the binding source. For more information, see Data Binding.

The following code example demonstrates how to use this method.


<TextBox x:Name="textBox1" Text="{Binding Test, Mode=TwoWay, UpdateSourceTrigger=Explicit}" />
<Button Content="Update" Click="Button_Click" />



public class TestData
{
    public String Test { get; set; }
}

TestData data;

public MainPage()
{
    InitializeComponent();
    data = new TestData { Test = "one" };
    textBox1.DataContext = data;
}

private void Button_Click(object sender, RoutedEventArgs e)
{
    BindingExpression expression = textBox1.GetBindingExpression(TextBox.TextProperty);
    MessageBox.Show("Before UpdateSource, Test = " + data.Test);
    expression.UpdateSource();
    MessageBox.Show("After UpdateSource, Test = " + data.Test);
}


Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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