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CollectionView<T> Class

In This Article
Namespace:
ActiproSoftware.UI.Avalonia.Data
Assembly:
ActiproSoftware.Avalonia.Shared.dll

Defines a managed view over a collection with capability to sort, group, filter, and limit the number of items in the view.

public class CollectionView<T> : ICollectionView<T>, ICollectionView
Type Parameters:
T -

The type.

Inheritance:
object object
Implements:
ICollectionView<T> ICollectionView

Remarks

This experimental class is subject to breaking changes and should only be used in conjunction with Actipro controls in the manner directed.

Constructors

CollectionView(IEnumerable<T>)

Initializes an instance of the class.

public CollectionView(IEnumerable<T> collection)
Parameter Type Description
collection IEnumerable<T>

The source collection to be managed by the view.

Properties

Count

Gets the number of elements contained in the ICollection<T>.

public int Count { get; }

Property Value

int:

The number of elements contained in the ICollection<T>.

Filter

A filter used to determine which items are included in the view.

public Predicate<T>? Filter { get; set; }

Property Value

Predicate<T>

GroupDescriptions

Defines grouping to be applied to the view.

public ObservableCollection<GroupDescription<T>> GroupDescriptions { get; }

Property Value

ObservableCollection<GroupDescription<T>>

Remarks

Only a single group is supported at this time.

Groups

The groups of items including by the view of this collection.

public ObservableCollection<CollectionViewGroup> Groups { get; }

Property Value

ObservableCollection<CollectionViewGroup>

HasFilter

Indicates if the view has defined a filter.

public bool HasFilter { get; }

Property Value

bool

HasGroups

Indicates if the view has defined any groups.

public bool HasGroups { get; }

Property Value

bool

MaxItemCount

The maximum number of items to be included in the view.

public int MaxItemCount { get; set; }

Property Value

int

SortDescriptions

Defines the order in which items are sorted for the view.

public ObservableCollection<SortDescription<T>> SortDescriptions { get; }

Property Value

ObservableCollection<SortDescription<T>>

Methods

Contains(T)

Determines whether the ICollection<T> contains a specific value.

public bool Contains(T value)
Parameter Type Description
value T

Returns

bool:

true if item is found in the ICollection<T>; otherwise, false.

GetGroupNames(bool)

Gets the name of the available groups, optionally included groups that are excluded by the current filter.

public IEnumerable<string?> GetGroupNames(bool ignoreFilter)
Parameter Type Description
ignoreFilter bool

When true, group names will be included for items that are part of the collection but currently excluded due to a filter.

Returns

IEnumerable<string>

GetItemAt(int)

Gets the item at the specified index of the view.

public virtual T GetItemAt(int index)
Parameter Type Description
index int

The index of the item.

Returns

T

IndexOf(T)

Gets the index of the item within the view.

public virtual int IndexOf(T item)
Parameter Type Description
item T

The item to examine.

Returns

int:

The index of the item within the view, or -1 if the item could not be found.

PassesFilter(T)

Tests if an item passes the filter.

protected bool PassesFilter(T item)
Parameter Type Description
item T

The item to examine.

Returns

bool:

true if the item passes the filter and should be included in the view; otherwise, false.

Refresh()

Refreshes the view.

public void Refresh()

ResolveGroupName(T)

Resolves the group name, if any, that applies to the given item.

public string? ResolveGroupName(T item)
Parameter Type Description
item T

The item to examine.

Returns

string:

The group name, or null if a group name is not available.

Events

CollectionChanged

Occurs when the collection changes.

public event NotifyCollectionChangedEventHandler? CollectionChanged

Event Type

NotifyCollectionChangedEventHandler

Inherited Members

Extension Methods