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2012-08-21T14:15:03.253
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2012-08-21T14:15:03.253
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I've implemented this behavior. First you need to subscribe to your ViewModel <code>ErrorsChanged</code> and <code>PropertyChanged</code> methods. I am doing this in my constructor: <pre><code> /// <summary> /// Initializes new instance of the View class. /// </summary> public View(ViewModel viewModel) { if (viewModel == null) throw new ArgumentNullException("viewModel"); // Initialize the control InitializeComponent(); // exception // Set view model to data context. DataContext = viewModel; viewModel.PropertyChanged += new PropertyChangedEventHandler(_ViewModelPropertyChanged); viewModel.ErrorsChanged += new EventHandler<DataErrorsChangedEventArgs>(_ViewModelErrorsChanged); } </code></pre> Then write handlers for this events: <pre><code> /// <summary> /// If model errors has changed and model still have errors set flag to true, /// if we dont have errors - set flag to false. /// </summary> /// <param name="sender">Ignored.</param> /// <param name="e">Ignored.</param> private void _ViewModelErrorsChanged(object sender, DataErrorsChangedEventArgs e) { if ((this.DataContext as INotifyDataErrorInfo).HasErrors) _hasErrorsRecentlyChanged = true; else _hasErrorsRecentlyChanged = false; } /// <summary> /// Iterate over view model visual childrens. /// </summary> /// <param name="sender">Ignored.</param> /// <param name="e">Ignored.</param> private void _ViewModelPropertyChanged(object sender, PropertyChangedEventArgs e) { if ((this.DataContext as INotifyDataErrorInfo).HasErrors) _LoopThroughControls(this); } </code></pre> And finally add method: <pre><code> /// <summary> /// If we have error and we haven't already set focus - set focus to first control with error. /// </summary> /// <remarks>Recursive.</remarks> /// <param name="parent">Parent element.</param> private void _LoopThroughControls(UIElement parent) { // Check that we have error and we haven't already set focus if (!_hasErrorsRecentlyChanged) return; int count = VisualTreeHelper.GetChildrenCount(parent); // VisualTreeHelper.GetChildrenCount for TabControl will always return 0, so we need to // do this branch of code. if (parent.GetType().Equals(typeof(TabControl))) { TabControl tabContainer = ((TabControl)parent); foreach (TabItem tabItem in tabContainer.Items) { if (tabItem.Content == null) continue; _LoopThroughControls(tabItem.Content as UIElement); } } // If element has childs. if (count > 0) { for (int i = 0; i < count; i++) { UIElement child = (UIElement)VisualTreeHelper.GetChild(parent, i); if (child is System.Windows.Controls.Control) { var control = (System.Windows.Controls.Control)child; // If control have error - we found first control, set focus to it and // set flag to false. if ((bool)control.GetValue(Validation.HasErrorProperty)) { _hasErrorsRecentlyChanged = false; control.Focus(); return; } } _LoopThroughControls(child); } } } </code></pre>
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