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POHow to achieve focus-reset to update BindingSource of TextBox before any action
 

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    <p>I have observed some unexpected or at least not-perfectly-matching-my-needs behaviour of textboxes bound to textproperties when I can't use using UpdateTrigger=PropertyChanged for my binding. Probably it is not an issue with the textbox but will occur with other editors as well.</p> <p>In my example (source code attached), I have a WPF TabControl bound to some collection. On each tab, you can edit an item from the collection, in various ways you can trigger a save-action, which should save the edits to some model. The textboxes bound to each items' properties are (on purpose) kept to default update-trigger 'OnFocusLost'. This is because there is some expensive validation taking place when a new value is set.</p> <p>Now I found there are at least two ways to trigger my save-action in such a way, that the last focused textbox does not update the bound value. 1) Changing the tab-item via mouse-click on its header and then clicking some save-button. (changing back to the previous tab shows that the new value is even lost) 2) Triggering the save-command via KeyGesture.</p> <p>I setup an example application that demonstrates the behaviour. Clicking on "Save All" will show all item values, the other save-button only shows the current item.</p> <p><strong>Q:</strong> What would be the best way to make sure that all bindingsources of all my textboxes will be updated before the bound objects are comitted? Preferably there should be a single way that catches all possibilites, I dislike to catch each event differently, since I would worry to have forgotten some events. Observing the selection-changed-event of the tab-control for example would solve issue 1) but not issue 2).</p> <p>Now to the example:</p> <p>XAML first:</p> <pre><code>&lt;Window x:Class="TestOMat.TestWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:TestOMat="clr-namespace:TestOMat" Title="TestOMat" x:Name="wnd"&gt; &lt;Grid&gt; &lt;Grid.Resources&gt; &lt;DataTemplate x:Key="dtPerson" DataType="{x:Type TestOMat:Person}"&gt; &lt;StackPanel Orientation="Vertical"&gt; &lt;StackPanel.CommandBindings&gt; &lt;CommandBinding Command="Close" Executed="CmdSaveExecuted"/&gt; &lt;/StackPanel.CommandBindings&gt; &lt;TextBox Text="{Binding FirstName}"/&gt; &lt;TextBox Text="{Binding LastName}"/&gt; &lt;Button Command="ApplicationCommands.Stop" CommandParameter="{Binding}"&gt;Save&lt;/Button&gt; &lt;/StackPanel&gt; &lt;/DataTemplate&gt; &lt;/Grid.Resources&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition/&gt; &lt;RowDefinition/&gt; &lt;/Grid.RowDefinitions&gt; &lt;Grid.CommandBindings&gt; &lt;CommandBinding Command="ApplicationCommands.Stop" Executed="CmdSaveAllExecuted"/&gt; &lt;/Grid.CommandBindings&gt; &lt;TabControl ItemsSource="{Binding ElementName=wnd, Path=Persons}" ContentTemplate="{StaticResource dtPerson}" SelectionChanged="TabControl_SelectionChanged"/&gt; &lt;Button Grid.Row="1" Command="ApplicationCommands.Stop"&gt;Save All&lt;/Button&gt; &lt;/Grid&gt;&lt;/Window&gt; </code></pre> <p>And the corresponding class</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Windows; using System.Windows.Controls; namespace TestOMat { /// &lt;summary&gt; /// Interaction logic for TestOMat.xaml /// &lt;/summary&gt; public partial class TestWindow : Window { public TestWindow() { InitializeComponent(); } private List&lt;Person&gt; persons = new List&lt;Person&gt; { new Person {FirstName = "John", LastName = "Smith"}, new Person {FirstName = "Peter", LastName = "Miller"} }; public List&lt;Person&gt; Persons { get { return persons; } set { persons = value; } } private void CmdSaveExecuted(object sender, System.Windows.Input.ExecutedRoutedEventArgs e) { Person p = e.Parameter as Person; if (p != null) { MessageBox.Show(string.Format("FirstName={0}, LastName={1}", p.FirstName, p.LastName)); e.Handled = true; } } private void CmdSaveAllExecuted(object sender, System.Windows.Input.ExecutedRoutedEventArgs e) { MessageBox.Show(String.Join(Environment.NewLine, Persons.Select(p=&gt;string.Format("FirstName={0}, LastName={1}", p.FirstName, p.LastName)).ToArray())); e.Handled = true; } private void TabControl_SelectionChanged(object sender, SelectionChangedEventArgs e) { Console.WriteLine(String.Format("Selection changed from {0} to {1}", e.RemovedItems, e.AddedItems)); // Doing anything here only avoids loss on selected-tab-change } } public class Person { public string FirstName { get; set; } public string LastName { get; set; } } } </code></pre>
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