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POIs there some event showing that new ContentTemplate is completely applied?
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  1. POIs there some event showing that new ContentTemplate is completely applied?
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    copied!<p>I have a ContentControl that I want to change it's ContentTemplate in some event. I want to add some values (text to TextBox) when control in ContentTemplate loaded. But, I has discovered that new ContentTemplate is applied (in terms of loading all controls of new template) NOT DIRECTLY after changing property ContentTemplate.</p> <pre><code>myContentControl.ContentTemplate = newContentTemplate; // at this line controls of new template are not loaded! </code></pre> <p>I tested by added this code after that line:</p> <pre><code>var cp = GetVisualChild&lt;ContentPresenter&gt;(myContentControl); var txt = myContentControl.ContentTemplate.FindName("Path_Cover", cp) as TextBox; txt.Text = "test"; </code></pre> <p>GetVisualChild</p> <pre><code>private T GetVisualChild&lt;T&gt;(DependencyObject parent) where T : Visual { T child = default(T); int numVisuals = VisualTreeHelper.GetChildrenCount(parent); for (int i = 0; i &lt; numVisuals; i++) { Visual v = (Visual)VisualTreeHelper.GetChild(parent, i); child = v as T; if (child == null) { child = GetVisualChild&lt;T&gt;(v); } if (child != null) { break; } } return child; } </code></pre> <p>I've got an error:</p> <blockquote> <p>This operation is valid only on elements that have this template applied.</p> </blockquote> <p>Is there some event showing that new ContentTemplate is completely applied?</p> <p><strong>EDIT 1</strong></p> <p>@eran I tried onApplyTemplate</p> <pre><code>public override void OnApplyTemplate() { var cp = GetVisualChild&lt;ContentPresenter&gt;(Content_Option); var txt = Content_Option.ContentTemplate.FindName("Path_Cover", cp) as TextBox; txt.Text = "test"; } </code></pre> <p>but got error:</p> <blockquote> <p>Object reference not set to an instance of an object.</p> </blockquote> <p><strong>EDIT 2</strong></p> <p>this "dirty" method works just fine:</p> <pre><code>myContentControl.ContentTemplate = newContentTemplate; System.Windows.Threading.DispatcherTimer timer = new System.Windows.Threading.DispatcherTimer(); timer.Interval = TimeSpan.FromMilliseconds(0.000001); timer.Tick += new EventHandler(delegate(object s, EventArgs a) { timer.Stop(); var cp = GetVisualChild&lt;ContentPresenter&gt;(Content_Option); var txt = Content_Option.ContentTemplate.FindName("Path_Cover", cp) as TextBox; txt.Text = "teSt"; }); timer.Start(); </code></pre> <p>can somebody help me to achieve the same result with more "clean" (profesional) way :)</p> <p><strong>EDIT 3</strong></p> <p>My Scenario is, I have a TreeView (on left side) as menu and a Grid (on right side) as display for ContentControl. TreeView has some nodes. Each node has it's own DataTemplate. Each time a TreeView node clicked, a DataTemplate is set to ContentControl and a value (ex. Path_Cover.Text) is set from database. The layout more or less like windows explorer.</p> <p>Well, this is all necessary code:</p> <p><strong>XAML</strong></p> <pre><code> &lt;UserControl.Resources&gt; &lt;DataTemplate x:Key="General"&gt; &lt;StackPanel&gt; &lt;DockPanel&gt; &lt;TextBlock Text="Cover"/&gt; &lt;TextBox Name="Path_Cover"/&gt; &lt;/DockPanel&gt; &lt;DockPanel&gt; &lt;TextBlock Text="Slide"/&gt; &lt;TextBox Name="Path_Slide"/&gt; &lt;/DockPanel&gt; &lt;/StackPanel&gt; &lt;/DataTemplate&gt; &lt;DataTemplate x:Key="Appearance"&gt; &lt;StackPanel&gt; &lt;DockPanel&gt; &lt;TextBlock Text="Cover"/&gt; &lt;TextBox Name="Path_Cover"/&gt; &lt;/DockPanel&gt; &lt;DockPanel&gt; &lt;Button Content="Get Theme"/&gt; &lt;TextBox Name="Txt_Theme"/&gt; &lt;/DockPanel&gt; &lt;/StackPanel&gt; &lt;/DataTemplate&gt; &lt;UserControl.REsources&gt; &lt;Grid&gt; &lt;ContentControl Name="myContentControl"/&gt; &lt;/Grid&gt; </code></pre> <p><strong>Code Behind</strong></p> <pre><code>private void TreeMenu_SelectionChanged(object sender, SelectionChangedEventArgs e) { myContentControl.ContentTemplate =(DataTemplate)this.Resources[Tree_Menu.SelectedItem.ToString()]; System.Windows.Threading.DispatcherTimer timer = new System.Windows.Threading.DispatcherTimer(); timer.Interval = TimeSpan.FromMilliseconds(0.000001); timer.Tick += new EventHandler(delegate(object s, EventArgs a) { timer.Stop(); switch (Tree_Menu.SelectedItem.ToString()) { case "General": var cp = GetVisualChild&lt;ContentPresenter&gt;(Content_Option); var txt = Content_Option.ContentTemplate.FindName("Path_Cover", cp) as TextBox; txt.Text = "test"; txt = Content_Option.ContentTemplate.FindName("Path_Slide", cp) as TextBox; txt.Text = "test"; break; case "Appearance": var cp = GetVisualChild&lt;ContentPresenter&gt;(Content_Option); var txt = Content_Option.ContentTemplate.FindName("Txt_Theme", cp) as TextBox; txt.Text = "test"; break; } }); timer.Start(); } </code></pre> <p>I'm just need to "move" the code inside timer.tick event handler to some new event that fire after DataTemplate/ContentTemplate completely applied.</p>
 

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