Databases
StackOverflow2013
Postsdbo
POContentTemplateSelector is only called one time showing always the same datatemplate
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POContentTemplateSelector is only called one time showing always the same datatemplate
    primarykey
    data
    text
    <p>I have made a sample demo VS 2010 RC sample project, because in my production project I have the same error using MVVM.</p> <p>In my sample demo project I use only Code-behind without 3rd party dependencies so you can download the demo project here and run it for yourself: <a href="http://www.sendspace.com/file/mwx7wv" rel="noreferrer">http://www.sendspace.com/file/mwx7wv</a></p> <p>Now to the problem: When I click the girls/boys button it should switch the datatemplate, not?</p> <p>What do I wrong?</p> <p>OK I offer here a code snippet too:</p> <p><strong>Code-Behind MainWindow.cs</strong>:</p> <pre><code>namespace ContentTemplateSelectorDemo { /// &lt;summary&gt; /// Interaction logic for MainWindow.xaml /// &lt;/summary&gt; public partial class MainWindow : Window { Person person; public MainWindow() { InitializeComponent(); person = new Person(){ Gender = "xxx"}; person.IsBoy = true; ContentGrid.DataContext = person; } private void btnBoys_Click(object sender, RoutedEventArgs e) { person.IsBoy = true; person.IsGirl = false; this.ContentGrid.DataContext = person; } private void btnGirls_Click(object sender, RoutedEventArgs e) { person.IsGirl = true; person.IsBoy = false; this.ContentGrid.DataContext = person; } } } </code></pre> <p><strong>XAML MainWindow.xaml:</strong></p> <pre><code>&lt;Window x:Class="ContentTemplateSelectorDemo.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:ContentTemplateSelectorDemo" Title="MainWindow" Height="350" Width="525"&gt; &lt;Window.Resources&gt; &lt;DataTemplate x:Key="girlsViewTemplate"&gt; &lt;local:UserControl1 /&gt; &lt;/DataTemplate&gt; &lt;DataTemplate x:Key="boysViewTemplate" &gt; &lt;local:UserControl2 /&gt; &lt;/DataTemplate&gt; &lt;local:PersonDataTemplateSelector x:Key="PersonSelector" /&gt; &lt;/Window.Resources&gt; &lt;Grid x:Name="ContentGrid" &gt; &lt;StackPanel&gt; &lt;Button Name="btnGirls" Click="btnGirls_Click"&gt;Switch Girls&lt;/Button&gt; &lt;Button Name="btnBoys" Click="btnBoys_Click"&gt;Switch Boys&lt;/Button&gt; &lt;ContentControl Content="{Binding}" ContentTemplateSelector="{StaticResource ResourceKey=PersonSelector}" /&gt; &lt;/StackPanel&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p><strong>DataTemplateSelector class:</strong></p> <pre><code>public class PersonDataTemplateSelector : DataTemplateSelector { public override DataTemplate SelectTemplate(object item,DependencyObject container) { if (item is Person) { Person person = item as Person; Window window = Application.Current.MainWindow; if (System.ComponentModel.DesignerProperties.GetIsInDesignMode( window)) return null; if (person.IsBoy) return window.FindResource("boysViewTemplate") as DataTemplate; if (person.IsGirl) return window.FindResource("girlsViewTemplate") as DataTemplate; } return null; } } </code></pre> <p>:)</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USThomas Levesque
    1. USmsfanboy
    plurals
    1. PL
      singulars
      1. LTLinked
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POContentTemplateSelector is only called one time showing always the same datatemplate
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POContentTemplateSelector is only called one time showing always the same datatemplate
      1. USjpierson
      1. VTFavorite
    3. VO
      singulars
      1. POContentTemplateSelector is only called one time showing always the same datatemplate
      1. This table or related slice is empty.
      1. VTUpMod
    1. COBetter post code snippets instead of offering a download, people are most likely not going to download that.
      singulars
      1. POContentTemplateSelector is only called one time showing always the same datatemplate
      1. USGerrie Schenck
    2. COok edited my init post!
      singulars
      1. POContentTemplateSelector is only called one time showing always the same datatemplate
      1. USmsfanboy
    3. COok after some research: http://joshsmithonwpf.wordpress.com/2007/03/18/updating-the-ui-when-binding-directly-to-business-objects-that-are-modified/ like josh said in his code comments: "...This is necessary because the WPF binding system will ignore a // PropertyChanged notification if the property returns the same object reference as before..." I must not return the same object instead I have to recreate the Person object in the buttons eventhandler like: ... = new Person(){ IsBoy = true, IsGirl = false} etc... then it works. thank you josh!
      singulars
      1. POContentTemplateSelector is only called one time showing always the same datatemplate
      1. USmsfanboy
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload