PagedCollectionView Class

Silverlight

Represents a view for grouping, sorting, filtering, and navigating a paged data collection.

Inheritance Hierarchy

System.Object
System.Windows.Data.PagedCollectionView

Namespace: System.Windows.Data
Assembly: System.Windows.Data (in System.Windows.Data.dll)

Syntax

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JScript

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public sealed class PagedCollectionView : ICollectionView, 
 IEnumerable, INotifyCollectionChanged, IPagedCollectionView, IEditableCollectionView, INotifyPropertyChanged

The PagedCollectionView type exposes the following members.

Constructors

	Name	Description
	PagedCollectionView(IEnumerable)	Initializes a new instance of the PagedCollectionView class.
	PagedCollectionView(IEnumerable, Boolean, Boolean)	Initializes a new instance of the PagedCollectionView class and specifies whether the data is sorted and in group order.

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Properties

	Name	Description
	CanAddNew	Gets a value that indicates whether a new item can be added to the collection.
	CanCancelEdit	Gets a value that indicates whether the collection view can discard pending changes and restore the original values of an edited object.
	CanChangePage	Gets a value that indicates whether the PageIndex value can change.
	CanFilter	Gets a value that indicates whether this view supports filtering by way of the Filter property.
	CanGroup	Gets a value that indicates whether this view supports grouping.
	CanRemove	Gets a value that indicates whether an item can be removed from the collection.
	CanSort	Gets a value that indicates whether this view supports sorting.
	Count	Gets the number of records in the view after filtering, sorting, and paging.
	Culture	Gets or sets the cultural information for any operations of the view that might differ by culture, such as sorting.
	CurrentAddItem	Gets the item that is being added when an AddNew transaction is in progress.
	CurrentEditItem	Gets the item in the collection that is being edited when an EditItem transaction is in progress.
	CurrentItem	Gets the current item in the view.
	CurrentPosition	Gets the ordinal position of the CurrentItem in the view, which might be sorted and filtered.
	Filter	Gets or sets a callback that is used to determine whether an item is suited for inclusion in the view.
	GroupDescriptions	Gets a collection of GroupDescription objects that describe how the items in the collection are grouped in the view.
	Groups	Gets the top-level groups, constructed according to the descriptions specified in the GroupDescriptions property.
	IsAddingNew	Gets a value that indicates whether an AddNew transaction is in progress.
	IsCurrentAfterLast	Gets a value that indicates whether the CurrentItem of the view is beyond the end of the collection.
	IsCurrentBeforeFirst	Gets a value that indicates whether the CurrentItem of the view is before the start of the collection.
	IsEditingItem	Gets a value that indicates whether an EditItem transaction is in progress.
	IsEmpty	Gets a value that indicates whether the view is empty.
	IsPageChanging	Gets a value that indicates whether the page index is changing.
	Item	Gets the item at the specified index.
	ItemCount	Gets the minimum number of items known to be in the source collection that satisfy the current filter.
	NeedsRefresh	Gets a value that indicates whether this view needs to be refreshed.
	NewItemPlaceholderPosition	Gets or sets a value that indicates whether to include a new item placeholder in the collection view, and where to include it.
	PageIndex	Gets the zero-based index of the current page.
	PageSize	Gets or sets the number of items to display on a page.
	SortDescriptions	Gets a collection of SortDescription objects that describe how the items in the collection are sorted in the view.
	SourceCollection	Gets the IEnumerable collection underlying this view.
	TotalItemCount	Gets the total number of items in the view before paging is applied.

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Methods

	Name	Description
	AddNew	Adds a new item to the underlying collection.
	CancelEdit	Ends the edit transaction and, if it is possible, restores the original value of the item.
	CancelNew	Ends the add transaction and discards the pending new item.
	CommitEdit	Ends the edit transaction and saves the pending changes.
	CommitNew	Ends the add transaction and saves the pending new item.
	Contains	Returns a value that indicates whether the specified item belongs to this collection view.
	DeferRefresh	Enters a defer cycle that you can use to merge changes to the view and delay automatic refresh.
	EditItem	Begins an edit transaction on the specified item.
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetEnumerator	Returns an IEnumerator object that you can use to enumerate the items in the view.
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetItemAt	Gets the item at the specified zero-based index in this PagedCollectionView, after the source collection is filtered, sorted, and paged.
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	IndexOf	Returns the zero-based index at which the specified item is located.
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	MoveCurrentTo	Sets the specified item to be the CurrentItem in the view.
	MoveCurrentToFirst	Sets the first item in the view as the CurrentItem.
	MoveCurrentToLast	Sets the last item in the view as the CurrentItem.
	MoveCurrentToNext	Set the item after the CurrentItem in the view as the CurrentItem.
	MoveCurrentToPosition	Sets the item at the specified index to be the CurrentItem in the view.
	MoveCurrentToPrevious	Sets the item before the CurrentItem in the view as the CurrentItem.
	MoveToFirstPage	Sets the first page as the current page.
	MoveToLastPage	Sets the last page as the current page.
	MoveToNextPage	Moves to the page after the current page.
	MoveToPage	Moves to the page at the specified index.
	MoveToPreviousPage	Moves to the page before the current page.
	PassesFilter	Returns a value that indicates whether the specified item in the underlying collection belongs to the view after filters are applied.
	Refresh	Re-creates the view.
	Remove	Removes the specified item from the collection.
	RemoveAt	Removes the item at the specified position from the collection.
	ToString	Returns a String that represents the current Object. (Inherited from Object.)

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Events

	Name	Description
	CollectionChanged	Occurs when the view has changed.
	CurrentChanged	Occurs after the CurrentItem has changed.
	CurrentChanging	Occurs when the CurrentItem is changing.
	PageChanged	Occurs after the PageIndex has changed.
	PageChanging	Occurs when the PageIndex is changing.
	PropertyChanged	Occurs after a property value has changed.

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Extension Methods

	Name	Description
	AsQueryable	Converts an IEnumerable to an IQueryable. (Defined by Queryable.)
	Cast<TResult>	Converts the elements of an IEnumerable to the specified type. (Defined by Enumerable.)
	OfType<TResult>	Filters the elements of an IEnumerable based on a specified type. (Defined by Enumerable.)

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Explicit Interface Implementations

	Name	Description
	IEnumerable.GetEnumerator	Returns an enumerator that iterates through a collection.
	INotifyCollectionChanged.CollectionChanged	Occurs when the items list of the collection has changed, or the collection is reset.
	INotifyPropertyChanged.PropertyChanged	Occurs when a property value changes.

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Remarks

You use a PagedCollectionView to provide grouping, sorting, filtering, and paging functionality for any collection that implements the IEnumerable interface. The DataPager control provides a convenient user interface for controlling paging with a PagedCollectionView.

You can think of a collection view as a layer on top of a binding source collection that allows you to navigate and display the collection based on sort, filter, and group queries, all without having to manipulate the underlying source collection itself.

Examples

The following code example demonstrates how to use a PagedCollectionView with a DataPager to page through data displayed in a ListBox. The List<T> that stores the data is wrapped in a PagedCollectionView, which provides paging functionality. Both the DataPager and the ListBox use the PagedCollectionView as their data source.

XAML

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<!-- NOTE: 
  By convention, the sdk prefix indicates a URI-based XAML namespace declaration 
  for Silverlight SDK client libraries. This namespace declaration is valid for 
  Silverlight 4 only. In Silverlight 3, you must use individual XAML namespace 
  declarations for each CLR assembly and namespace combination outside the scope 
  of the default Silverlight XAML namespace. For more information, see the help 
  topic "Prefixes and Mappings for Silverlight Libraries". 
-->
<UserControl x:Class="DataPagerSample.MainPage"
    xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"  
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480">
    <Grid x:Name="LayoutRoot" Width="400">
        <StackPanel Margin="10">
            <sdk:DataPager x:Name="dataPager1"
                            PageSize="5"
                            AutoEllipsis="True"
                            NumericButtonCount="3"
                            DisplayMode="FirstLastPreviousNextNumeric"
                            IsTotalItemCountFixed="True"/>

            <ListBox x:Name="listBox1" />
        </StackPanel>
    </Grid>
</UserControl>

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JScript

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using System;
using System.Collections.Generic;
using System.Windows.Controls;
using System.Windows.Data;

namespace DataPagerSample
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
            List<String> itemList = new List<String>();
            // Generate some items to add to the list.
            for (int i = 1; i <= 33; i++)
            {
                System.Text.StringBuilder sb = new System.Text.StringBuilder("Item ");
                sb.Append(i.ToString());
                itemList.Add(sb.ToString());
            }
            // Wrap the itemList in a PagedCollectionView for paging functionality
            PagedCollectionView itemListView = new PagedCollectionView(itemList);

            // Set the DataPager and ListBox to the same data source.
            dataPager1.Source = itemListView;
            listBox1.ItemsSource = itemListView;
        }
    }
}