Represents a view for grouping, sorting, filtering, and navigating a data collection.
Assembly: PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation
Thetype exposes the following members.
|CanFilter||Gets a value that indicates whether the view supports filtering.|
|CanGroup||Gets a value that indicates whether the view supports grouping.|
|CanSort||Gets a value that indicates whether the view supports sorting.|
|Comparer||Returns an object that you can use to compare items in the view.|
|Count||Gets the number of records in the view.|
|Culture||Gets or sets the culture information to use during sorting.|
|CurrentItem||Gets the current item in the view.|
|CurrentPosition||Gets the ordinal position of the CurrentItem within the (optionally sorted and filtered) view.|
|Dispatcher||Gets the Dispatcher this DispatcherObject is associated with. (Inherited from DispatcherObject.)|
|Filter||Gets or sets a method used to determine if an item is suitable for inclusion in the view.|
|GroupDescriptions||Gets a collection of GroupDescription objects that describes how the items in the collection are grouped in the view.|
|Groups||Gets a collection of the top-level groups that is constructed based on the GroupDescriptions property.|
|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 beginning of the collection.|
|IsCurrentInSync||Gets a value that indicates whether the CurrentItem is at the CurrentPosition.|
|IsDynamic||Gets a value that indicates whether the underlying collection provides change notifications.|
|IsEmpty||Gets a value that indicates whether the resulting (filtered) view is empty.|
|IsRefreshDeferred||Gets a value that indicates whether there is an outstanding DeferRefresh in use.|
|NeedsRefresh||Gets a value that indicates whether the view needs to be refreshed.|
|NewItemPlaceholder||Gets the object that is in the collection to represent a new item.|
|SortDescriptions||Gets a collection of SortDescription structures that describes how the items in the collection are sorted in the view.|
|SourceCollection||Returns the underlying unfiltered collection.|
|UpdatedOutsideDispatcher||Gets a value that indicates whether it has been necessary to update the change log because a CollectionChanged notification has been received on a different thread without first entering the user interface (UI) thread dispatcher.|
|CheckAccess||Determines whether the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject.)|
|ClearChangeLog||Clears any pending changes from the change log.|
|Contains||Returns a value that indicates whether the specified item belongs to the view.|
|DeferRefresh||Enters a defer cycle that you can use to merge changes to the view and delay automatic refresh.|
|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 it is reclaimed by garbage collection. (Inherited from Object.)|
|GetEnumerator||Returns an 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||Retrieves the item at the specified zero-based index in the view.|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|IndexOf||Returns the 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||Sets 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.|
|OKToChangeCurrent||Returns a value that indicates whether the view can change which item is the CurrentItem.|
|OnBeginChangeLogging||Called by the base class to notify the derived class that an INotifyCollectionChanged.CollectionChanged event has been posted to the message queue.|
|OnCollectionChanged(NotifyCollectionChangedEventArgs)||Raises the CollectionChanged event.|
|OnCollectionChanged(Object, NotifyCollectionChangedEventArgs)||Raises the CollectionChanged event.|
|OnCurrentChanged||Raises the CurrentChanged event.|
|OnCurrentChanging()||Raises a CurrentChanging event that is not cancelable.|
|OnCurrentChanging(CurrentChangingEventArgs)||Raises the CurrentChanging event with the specified arguments.|
|OnPropertyChanged||Raises the PropertyChanged event using the specified arguments.|
|PassesFilter||Returns a value that indicates whether the specified item in the underlying collection belongs to the view.|
|ProcessCollectionChanged||When overridden in a derived class, processes a single change on the UI thread.|
|Refresh||Re-creates the view.|
|RefreshOrDefer||Refreshes the view or specifies that the view needs to be refreshed when the defer cycle completes.|
|RefreshOverride||Re-creates the view.|
|SetCurrent(Object, Int32)||Sets the specified item and index as the values of the CurrentItem and CurrentPosition properties.|
|SetCurrent(Object, Int32, Int32)||Sets the specified item and index as the values of the CurrentItem and CurrentPosition properties. This method can be called from a constructor of a derived class.|
|ToString||Returns a string that represents the current object. (Inherited from Object.)|
|VerifyAccess||Enforces that the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject.)|
|AsParallel||Enables parallelization of a query. (Defined by ParallelEnumerable.)|
|AsQueryable||Converts an IEnumerable to an IQueryable. (Defined by Queryable.)|
|Cast<TResult>||Casts 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.)|
You should not create objects of this class in your code. To create a collection view for a collection that only implements IEnumerable, create a CollectionViewSource object, add your collection to the Source property, and get the collection view from the View property.
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. If the source collection implements the INotifyCollectionChanged interface, the changes that raise the CollectionChanged event are propagated to the views.
Because a view does not change the underlying source collection, a source collection can have multiple views associated with it. By using views, you can display the same data in different ways. For example, you can use two views on a collection of Task objects to show tasks sorted by priority on one part of the page and grouped by area on another part of the page.
In WPF applications, all collections have an associated default collection view. Rather than working with the collection directly, the binding engine always accesses the collection through the associated view. To get the default view, use the CollectionViewSource.GetDefaultView method. An internal class based on is the default view for collections that implement only IEnumerable. ListCollectionView is the default view for collections that implement IList. BindingListCollectionView is the default view for collections that implement IBindingListView or IBindingList.
Alternatively, you can create a view of your collection in Extensible Application Markup Language (XAML) by using the CollectionViewSource class and then bind your control to that view. The CollectionViewSource class is the XAML representation of the class. For an example, see How to: Sort and Group Data Using a View in XAML.
For more information, see "Binding to Collections" in Data Binding Overview.
Views allow the same data collection to be viewed in different ways, depending on sorting, filtering, or grouping criteria. Every collection has one shared default view, which is used as the actual binding source when a binding specifies a collection as its source. This example shows how to get the default view of a collection.
To create the view, you need an object reference to the collection. This data object can be obtained by referencing your own code-behind object, by getting the data context, by getting a property of the data source, or by getting a property of the binding. This example shows how to get the DataContext of a data object and use it to directly obtain the default collection view for this collection.
Alternatively, you can instantiate and bind to your own collection view using the CollectionViewSource class. This collection view is only shared by controls that bind to it directly. For an example, see the How to Create a View section in the Data Binding Overview.
For examples of the functionality provided by a collection view, see How to: Sort Data in a View, How to: Filter Data in a View, and How to: Navigate Through the Objects in a Data CollectionView.
|How to: Navigate Through the Objects in a Data CollectionView||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 class.|
|How to: Filter Data in a View||This example shows how to filter data in a view.|
|How to: Sort Data in a View||This example describes how to sort data in a view.|
|How to: Sort and Group Data Using a View in XAML||This example shows how to create a view of a data collection in Extensible Application Markup Language (XAML). Views allow for the functionalities of grouping, sorting, filtering, and the notion of a current item.|
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2