Class VirtualizingCollectionView

Represents a view for grouping, sorting, filtering, and navigating a data collection in on-demand.

Inheritance
System.Object
CollectionViewAdv
QueryableCollectionView
VirtualizingCollectionView
Implements
System.Collections.IEnumerable
System.ComponentModel.INotifyPropertyChanged
System.IDisposable
System.Collections.Specialized.INotifyCollectionChanged
Inherited Members
Namespace: Syncfusion.Maui.Data
Assembly: Syncfusion.Maui.Data.dll
Syntax
public class VirtualizingCollectionView : QueryableCollectionView, ICollectionViewAdv, IEnumerable, INotifyPropertyChanged, ISupportInitialize, ISupportIncrementalLoading, IDisposable, IPropertyChangedEventHandler, IEditableCollectionView, INotifyCollectionChanged, IUnboundExpressionFunc, IGridViewNotifier, IFilterExt, IParallelizableView

Constructors

VirtualizingCollectionView()

Initializes new instance of VirtualizingCollectionView class.

Declaration
public VirtualizingCollectionView()

VirtualizingCollectionView(IEnumerable)

Initializes a new instance of VirtualizingCollectionView class.

Declaration
public VirtualizingCollectionView(IEnumerable source)
Parameters
Type Name Description
System.Collections.IEnumerable source

Properties

RecordDictionary

Declaration
public Dictionary<int, RecordEntry> RecordDictionary { get; }
Property Value
Type
System.Collections.Generic.Dictionary<System.Int32, RecordEntry>

Methods

ApplyFilter(Predicate<Object>)

Applies filter based on specified RowFilter.

Declaration
protected virtual void ApplyFilter(Predicate<object> rowFilter)
Parameters
Type Name Description
System.Predicate<System.Object> rowFilter

Specifies the RowFilter to apply filter on collection

CreateRecords()

Creates a record for items in the ViewSource.

Declaration
protected override sealed RecordsList CreateRecords()
Returns
Type Description
RecordsList

Record for items in the ViewSource.
Overrides

CreateRowFilterPredicate()

Creates a row filter predicate which filters the items to be displayed in the view.

Declaration
protected override void CreateRowFilterPredicate()
Overrides

CreateTopLevelGroup()

Creates a Top Level Group.

Declaration
protected override TopLevelGroup CreateTopLevelGroup()
Returns
Type Description
TopLevelGroup

A top level group.
Overrides

GetGroupedSource(String[])

Gets the grouped result by specified properties.

Declaration
protected virtual IEnumerable<GroupResult> GetGroupedSource(string[] groupBy)
Parameters
Type Name Description
System.String[] groupBy

Specifies the properties to get the group result on collection
Returns
Type Description
System.Collections.Generic.IEnumerable<GroupResult>

Returns the collection of GroupResult.

GetGroupResult(String[])

Gets the IEnumerable collection of GroupResult for the array of groupBy.

Declaration
protected override sealed IEnumerable<GroupResult> GetGroupResult(string[] groupBy)
Parameters
Type Name Description
System.String[] groupBy
Returns
Type Description
System.Collections.Generic.IEnumerable<GroupResult>

the IEnumerable collection of GroupResult for the array of groupBy.
Overrides

GetIndexOf(Object)

Gets the index at which the specified item is located.

Declaration
protected virtual int GetIndexOf(object item)
Parameters
Type Name Description
System.Object item

Specifies the item to get the index
Returns
Type Description
System.Int32

Returns the index at which the specified item is located

GetItemProperties()

Gets the Collection of ItemProperies that contains,the property and its information.

Declaration
public override PropertyDescriptorCollection GetItemProperties()
Returns
Type Description
System.ComponentModel.PropertyDescriptorCollection

the Collection of ItemProperies that contains,the property and its information.
Overrides

GetSourceList()

Gets the SourceCollection to load items source in FilterPop-up control.

Declaration
public virtual IEnumerable GetSourceList()
Returns
Type Description
System.Collections.IEnumerable

Returns the source that were in view. Used in GridFilterControl. Other CollectionViewAdv returns source from CollectionViewAdv.Records.

GetViewRecordCount()

Gets the records count that are inview.

Declaration
public virtual int GetViewRecordCount()
Returns
Type Description
System.Int32

Returns the records count that are inview.

IndexOf(Object)

Gets the index of the given item.

Declaration
public override int IndexOf(object item)
Parameters
Type Name Description
System.Object item
Returns
Type Description
System.Int32

the index of the given item.
Overrides

OnSortDescriptionChanged(NotifyCollectionChangedEventArgs)

Invoked When the Sort Description Collection is Changed.

Declaration
protected override sealed void OnSortDescriptionChanged(NotifyCollectionChangedEventArgs e)
Parameters
Type Name Description
System.Collections.Specialized.NotifyCollectionChangedEventArgs e
Overrides

ProcessSort(SortDescriptionCollection)

Sorts the elements in the collection based on specified sort description.

Declaration
protected virtual void ProcessSort(SortDescriptionCollection sortDescription)
Parameters
Type Name Description
SortDescriptionCollection sortDescription

Specifies the sort description to sort the collection

RefreshGroupAfterFiltering(List<Group>)

Declaration
protected void RefreshGroupAfterFiltering(List<Group> groups)
Parameters
Type Name Description
System.Collections.Generic.List<Group> groups

RefreshSort()

Refreshes the sorting in the view.

Declaration
protected override sealed void RefreshSort()
Overrides

ResetFilter()

Resets the filter of the Collection View.

Declaration
protected override void ResetFilter()
Overrides

SetSource(IEnumerable)

Sets the Source of the collection view.

Declaration
protected override void SetSource(IEnumerable _source)
Parameters
Type Name Description
System.Collections.IEnumerable _source
Overrides

Implements

System.Collections.IEnumerable
System.ComponentModel.INotifyPropertyChanged
System.IDisposable
System.Collections.Specialized.INotifyCollectionChanged

Extension Methods