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BindingExpression.UpdateSource Method

Silverlight

Sends the current binding target value to the binding source property in TwoWay bindings.

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

public void UpdateSource()

Exceptions

Exception	Condition
InvalidOperationException	The BindingExpression is detached from the binding target.

Remarks

You can use this method to control when the data source is updated. This is useful, for example, to validate several controls together before you update their data sources.

Examples

The following code example demonstrates how to use this method.

XAML


<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);
}