I have a item control which is bound to Tasks. Each task has task state. I have defined different data templates for each task state, and also data template selector.
Problem is that I am not able to figure out how to trigger data template selector when task state is changed dynamically.
I want to know how to use data triggers together with data templates.
If this will not work out, i will explore other alternatives such as
1. Attached Property bound to task state. Any change will dynamically set data template.
2. Visual State Manager
A DataTemplateSelector
does not respond to PropertyChange
notifications, so it doesn't get re-evaluated when your properties change.
The alternative I use is DataTriggers
that changes the Template
based on a property.
For example, this will draw all TaskModel
objects using a ContentControl
, and the ContentControl.Template
is based on the TaskStatus
property of the TaskModel
<DataTemplate x:Key="OpenTaskTemplate" TargetType="{x:Type local:TaskModel}">
<TextBlock Text="I'm an Open Task" />
</DataTemplate>
<DataTemplate x:Key="ClosedTaskTemplate" TargetType="{x:Type local:TaskModel}">
<TextBlock Text="I'm a Closed Task" />
</DataTemplate>
<DataTemplate DataType="{x:Type local:TaskModel}">
<ContentControl Content="{Binding }">
<ContentControl.Style>
<Style TargetType="{x:Type ContentControl}">
<!-- Default Template -->
<Setter Property="ContentTemplate" Value="{StaticResource OpenTaskTemplate}" />
<!-- Triggers to change Template -->
<Style.Triggers>
<DataTrigger Binding="{Binding TaskStatus}" Value="Closed">
<Setter Property="ContentTemplate" Value="{StaticResource ClosedTaskTemplate}" />
</DataTrigger>
</Style.Triggers>
</Style>
</ContentControl.Style>
</ContentControl>
</DataTemplate>