Source and Paged Source

The one most important property of the RadDataPager is its Source property. This is where you pass in your collection of data for paging.

More often your collection will not be an IPagedCollectionView. It will either be a simple List, or an ObservableCollection, or anything that is simply an IEnumerable. Unless you had paging in mind when you designed your project, it is almost certain that your data source will not be pageable out of the box. From here on you have two options:

• Wrap your collection in an IPagedCollectionView / QueryableCollectionView

• Bind to the PagedSource property of the RadDataPager

Wrapping a collection in an IPagedCollectionView / QueryableCollectionView

If you look at the constructors of PagedCollectionView and QueryableCollectionView you will notice that you can pass in a simple IEnumerable as a parameter. Those two classes will wrap it and provide paging capabilities over your original data.

Imagine that you have a simple IEnumerable which is the source for an ItemsControl. Here is shown how to wrap it in order to enable paging with RadDataPager.

• C#
• VB.NET

IEnumerable itemsSource = Enumerable.Range(0, 1000); 
var pagedSource = new PagedCollectionView(itemsSource); 
this.radDataPager.Source = pagedSource; 
this.itemsControl.ItemsSource = pagedSource; 

Dim itemsSource As IEnumerable = Enumerable.Range(0, 1000) 
Dim pagedSource = New PagedCollectionView(itemsSource) 
Me.radDataPager.Source = pagedSource 
Me.itemsControl.ItemsSource = pagedSource 

• C#
• VB.NET

IEnumerable itemsSource = Enumerable.Range(0, 1000); 
var pagedSource = new QueryableCollectionView(itemsSource); 
this.radDataPager.Source = pagedSource; 
this.itemsControl.ItemsSource = pagedSource; 

Dim itemsSource As IEnumerable = Enumerable.Range(0, 1000) 
Dim pagedSource = New QueryableCollectionView(itemsSource) 
Me.radDataPager.Source = pagedSource 
Me.itemsControl.ItemsSource = pagedSource 

The QueryableCollectionView class is defined in the Telerik.Windows.Data namespace so make sure to include it in your page (via the Using or Import statements).

• XAML

<ListBox Name="itemsControl"/> 
<telerikGrid:RadDataPager Name="radDataPager" PageSize="10" DisplayMode="All"/> 

Binding to the PagedSource property of the RadDataPager

In case you do not like the first approach there is a better one. When you assign an IEnumerable as the Source of a RadDataPager it will automatically wrap it in a QueryableCollectionView and expose it through its PagedSource property. From then on, you can attach any number of ItemsControls to the PagedSource and they will be automatically paged. Here is how to do this entirely in XAML.

• XAML

<ListBox Name="itemsControl" 
         ItemsSource="{Binding PagedSource, ElementName=radDataPager}"/> 
<telerikGrid:RadDataPager Name="radDataPager" 
               Source="{Binding myItemsSource}" 
               PageSize="10" 
               DisplayMode="All"/>