Class QueryableCollectionView

Represents the class that maintains the collection view of type queryable collection view, when the SfDataGrid is bind to the queryable collection view.

Inheritance
System.Object
CollectionViewAdv
QueryableCollectionView
PagedCollectionView
VirtualizingCollectionView
GridQueryableCollectionViewWrapper
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 QueryableCollectionView : CollectionViewAdv, ICollectionViewAdv, IEnumerable, INotifyPropertyChanged, ISupportInitialize, ISupportIncrementalLoading, IDisposable, IPropertyChangedEventHandler, IEditableCollectionView, INotifyCollectionChanged, IUnboundExpressionFunc, IGridViewNotifier, IFilterExt, IParallelizableView

Constructors

QueryableCollectionView()

Initializes a new instance of the QueryableCollectionView class.

Declaration
public QueryableCollectionView()

QueryableCollectionView(IEnumerable)

Initializes a new instance of the QueryableCollectionView class.

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

The IEnumerable source of the collection view.

QueryableCollectionView(IEnumerable, Type)

Initializes a new instance of the QueryableCollectionView class.

Declaration
public QueryableCollectionView(IEnumerable source, Type sourceType)
Parameters
Type Name Description
System.Collections.IEnumerable source

The IEnumerable source of the collection view.
System.Type sourceType

The source type.

Properties

RowFilter

Gets or sets the predicate for the row filter.

Declaration
public Predicate<object> RowFilter { get; set; }
Property Value
Type Description
System.Predicate<System.Object>

The predicate for the row filter.

UsePLINQ

Gets or sets a value indicating whether to use PLINQ.

Declaration
public bool UsePLINQ { get; set; }
Property Value
Type Description
System.Boolean

True if PLINQ is used, otherwise false.

ViewSource

Gets the queryable collection for the source of the collection view.

Declaration
public IQueryable ViewSource { get; }
Property Value
Type Description
System.Linq.IQueryable

The queryable collection for the source of the collection view.

Methods

CanExecuteParallel(DataOperation)

Invokes to check whether source is need to execute execute in Parallel Query.

Declaration
protected virtual bool CanExecuteParallel(DataOperation operation)
Parameters
Type Name Description
DataOperation operation

DataOperation
Returns
Type Description
System.Boolean

Returns true if source is execute in parallel query

CreateRecords()

Creates the records for the items in the ViewSource.

Declaration
protected override RecordsList CreateRecords()
Returns
Type Description
RecordsList

The list of records created for the items in the ViewSource.
Overrides

CreateRowFilterPredicate()

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

Declaration
protected virtual void CreateRowFilterPredicate()

FilterRecord(Object)

Returns a boolean value indicating whether to filter underlying data from adding it to View.Records collection.

Declaration
public override bool FilterRecord(object record)
Parameters
Type Name Description
System.Object record

The record to filter.
Returns
Type Description
System.Boolean

A boolean value indicating whether to filter underlying data from adding it to View.Records collection.
Overrides

GetGroupResult(String[])

Gets the IEnumerable collection of group result for the array of group-by.

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

The array of groups
Returns
Type Description
System.Collections.Generic.IEnumerable<GroupResult>

The IEnumerable collection of group result for the array of group-by.
Overrides

GetPredicateExpression(IQueryable, out ParameterExpression)

Gets the predicate expression for the given source and parameter expression.

Declaration
public virtual Expression GetPredicateExpression(IQueryable source, out ParameterExpression parameterExpression)
Parameters
Type Name Description
System.Linq.IQueryable source

The IQueryable source
System.Linq.Expressions.ParameterExpression parameterExpression

The parameter expression.
Returns
Type Description
System.Linq.Expressions.Expression

The predicate expression for the given source and parameter expression.

GetPredicateExpression(IQueryable, out ParameterExpression, String, Boolean)

Declaration
public Expression GetPredicateExpression(IQueryable source, out ParameterExpression parameterExpression, string columnName, bool returncolExpression)
Parameters
Type Name Description
System.Linq.IQueryable source

The IQueryable source.
System.Linq.Expressions.ParameterExpression parameterExpression

The parameter expression.
System.String columnName

The column name.
System.Boolean returncolExpression

A boolean value indicating whether to return the column expression.
Returns
Type Description
System.Linq.Expressions.Expression

The predicate expression for the given values.

GetQueryableSource()

Returns the IQueryable source of the collection view.

Declaration
protected virtual IQueryable GetQueryableSource()
Returns
Type Description
System.Linq.IQueryable

The IQueryable source of the collection view.
Remarks

PagedCollectionView returns paged source as IQueryable. Returning query will be sorted query in the case of normal VirtualizingCollectionView. It will be sorted and filtered query in the case of PagedCollectionVeiw and OnDemand VirtualizingCollectionView.

OnSortDescriptionChanged(NotifyCollectionChangedEventArgs)

This method fires when the sort description collection is changed.

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

The System.Collections.Specialized.NotifyCollectionChangedEventArgs representing the data for the event.
Overrides

RefreshFilter(Boolean)

Refreshes the view when the filtering is applied through FilterRecord(Object) delegate.

Declaration
public override void RefreshFilter(bool isProgrammatic = false)
Parameters
Type Name Description
System.Boolean isProgrammatic

A boolean value indicating whether filtering is done programmatically.
Overrides

RefreshSort()

Refreshes sorting in the view.

Declaration
protected override void RefreshSort()
Overrides

RefreshSortingOrderWithFiltersForBottomLevel(List<Group>)

Refreshes the sorting order with filters on the records in the bottom-level group.

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

The list of groups in the view.

ResetFilter()

Resets the filter of the collection view.

Declaration
protected override void ResetFilter()
Overrides

SortQueryable(IQueryable, SortDescriptionCollection)

Sets the given source and the sort fields as queryable.

Declaration
protected virtual IQueryable SortQueryable(IQueryable source, SortDescriptionCollection sortFields = null)
Parameters
Type Name Description
System.Linq.IQueryable source

The IQueryable source of the items which has to be queried.
SortDescriptionCollection sortFields

The sort fields of the source which has to be queried.
Returns
Type Description
System.Linq.IQueryable

The IQueryable source of the items which is queried.

Implements

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

Extension Methods