NamedDataTemplateSelector

NamedDataTemplateSelector

The NamedDataTemplateSelector is a Xamarin.Forms DataTemplateSelector that looks up a DataTemplate dynamically based on the typename of the supplied BindingContext for the visual. It allows you to supply a heterogeneous collection of data to a ListView and get a unique data template for each unique System.Type.

Properties

• StripNamespace : true to remove the namespace from the type name before resolving the resource.

Example

In our VM or codebehind, we have a shape collection composed of different Shape-derived objects:

Shapes = new List<Shape> { new Circle(), new Square(), new Triangle() ... };

Then in XAML, we data bind a ListView to this collection and set the ItemTemplate to be a NamedDataTemplateSelector. It will walk the resource tree (starting at the ListView) and identify each DataTemplate by the type name of the object being visualized (Circle, Square, Triangle).

<Page>
   <Page.Resources>
      <Page.ResourceDictionary>
         <inf:NamedDataTemplateSelector x:Key="dtSelector" StripNamespace="true" />
      </Page.ResourceDictionary>

      <DataTemplate x:Key="Square">
          ...
      </DataTemplate>

      <DataTemplate x:Key="Circle">
          ...
      </DataTemplate>

      <DataTemplate x:Key="Triangle">
          ...
      </DataTemplate>
   </Page.Resources>
   
<ListView ItemsSource="{Binding Shapes}"
          ItemTemplate="{StaticResource dtSelector}" .. />