Hello,
I have made a sample demo VS 2010 RC sample project, because in my production project I have the same error using MVVM.
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: http://www.sendspace.com/file/mwx7wv
Now to the problem: When I click the girls/boys button it should switch the datatemplate, not?
What do I wrong?
OK I offer here a code snippet too:
Code-Behind MainWindow.cs:
namespace ContentTemplateSelectorDemo
{ /// /// Interaction logic for MainWindow.xaml /// 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;
}
}
}
XAML MainWindow.xaml:
<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">
<Window.Resources>
<DataTemplate x:Key="girlsViewTemplate">
<local:UserControl1 />
</DataTemplate>
<DataTemplate x:Key="boysViewTemplate" >
<local:UserControl2 />
</DataTemplate>
<local:PersonDataTemplateSelector x:Key="PersonSelector" />
</Window.Resources>
<Grid x:Name="ContentGrid" >
<StackPanel>
<Button Name="btnGirls" Click="btnGirls_Click">Switch Girls</Button>
<Button Name="btnBoys" Click="btnBoys_Click">Switch Boys</Button>
<ContentControl Content="{Binding}" ContentTemplateSelector="{StaticResource ResourceKey=PersonSelector}" />
</StackPanel>
</Grid>
DataTemplateSelector class:
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;
}
}
:)