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33 lines
2.4 KiB
Markdown
33 lines
2.4 KiB
Markdown
---
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title: "How to: Navigate Through the Objects in a Data CollectionView"
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ms.date: "03/30/2017"
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dev_langs:
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- "csharp"
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- "vb"
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helpviewer_keywords:
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- "CollectionView [WPF], navigating through objects"
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- "data binding [WPF], navigating through objects in data CollectionView"
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- "navigating through objects in data CollectionView [WPF]"
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ms.assetid: fcd37590-bce1-4ac9-8b74-3b96c7458b8a
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---
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# How to: Navigate Through the Objects in a Data CollectionView
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Views allow the same data collection to be viewed in different ways, depending on sorting, filtering, or grouping. Views also provide a current record pointer concept and enable moving the pointer. This example shows how to get the current object as well as navigate through the objects in a data collection using the functionality provided in the <xref:System.Windows.Data.CollectionView> class.
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## Example
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In this example, `myCollectionView` is a <xref:System.Windows.Data.CollectionView> object that is a view over a bound collection.
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In the following example, `OnButton` is an event handler for the `Previous` and `Next` buttons in an application, which are buttons that allow the user to navigate the data collection. Note that the <xref:System.Windows.Data.CollectionView.IsCurrentBeforeFirst%2A> and <xref:System.Windows.Data.CollectionView.IsCurrentAfterLast%2A> properties report whether the current record pointer has come to the beginning and the end of the list respectively so that <xref:System.Windows.Data.CollectionView.MoveCurrentToFirst%2A> and <xref:System.Windows.Data.CollectionView.MoveCurrentToLast%2A> can be called as appropriately.
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The <xref:System.Windows.Data.CollectionView.CurrentItem%2A> property of the view is cast as an `Order` to return the current order item in the collection.
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[!code-csharp[CollectionView#OnButton](~/samples/snippets/csharp/VS_Snippets_Wpf/CollectionView/CSharp/Page1.xaml.cs#onbutton)]
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[!code-vb[CollectionView#OnButton](~/samples/snippets/visualbasic/VS_Snippets_Wpf/CollectionView/VisualBasic/Page1.xaml.vb#onbutton)]
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## See also
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- [Data Binding Overview](/dotnet/desktop-wpf/data/data-binding-overview)
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- [Sort Data in a View](how-to-sort-data-in-a-view.md)
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- [Filter Data in a View](how-to-filter-data-in-a-view.md)
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- [Sort and Group Data Using a View in XAML](how-to-sort-and-group-data-using-a-view-in-xaml.md)
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- [How-to Topics](data-binding-how-to-topics.md)
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