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8.2

Force update of WPF data binding

Asked by medi911 in Visual Studio, WPF and Silverlight, .NET Framework 3.x versions

Tags: WPF binding update

Is there an easy way to force an update of a data bound dependency property from the source? This problem seams to occur only if the context is set on a parent object. So far I found two possible solutions: Assign the source property of the bound control to the data object - or - use the BackgroundWorker class to force a thread switch. The first solution is very cumbersome if there are a lot of controls on the page and the second is - well - kinda overkill.
Please see the attached snippet as a case study.
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// create text box with data binding
TextBox textBox = new TextBox();
Binding binding = new Binding();
binding.Path = new PropertyPath("Value");
binding.Mode = BindingMode.OneWay;
textBox.SetBinding(TextBox.TextProperty, binding);
 
// create panel and add text box
StackPanel panel = new StackPanel();
panel.DataContext = data;
panel.Children.Add(textBox);
 
// update binding
BindingExpression bindingExpression = textBox.GetBindingExpression(TextBox.TextProperty);
bindingExpression.UpdateTarget();
Console.WriteLine("1 > " + textBox.Text);   // --> NOT UPDATED !!!
[+][-]08/18/09 07:06 AM, ID: 25123312Expert Comment

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[+][-]08/18/09 07:21 AM, ID: 25123517Author Comment

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[+][-]08/18/09 07:37 AM, ID: 25123685Expert Comment

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[+][-]08/18/09 08:05 AM, ID: 25123980Author Comment

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[+][-]08/18/09 08:31 AM, ID: 25124281Accepted Solution

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About this solution

Zones: Visual Studio, WPF and Silverlight, .NET Framework 3.x versions
Tags: WPF binding update
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Solution Provided By: ToddBeaulieu
Participating Experts: 1
Solution Grade: B
 
[+][-]08/18/09 10:53 AM, ID: 25125759Author Comment

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