Class AutoCompleteBox

Represents a control that provides a text box for user input and a drop-down that contains possible matches based on the input in the text box.

Inheritance
System.Object
DependencyObject
UIElement
FrameworkElement
Control
AutoCompleteBox
Inherited Members
System.Windows.FrameworkElement.RegisterName(System.String, System.Object)
System.Windows.FrameworkElement.UnregisterName(System.String)
Namespace: System.Windows.Controls
Assembly: Controls.Input.OpenSilver.dll
Syntax
public class AutoCompleteBox : Control

Constructors

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AutoCompleteBox()

Initializes a new instance of the AutoCompleteBox class.

Declaration
public AutoCompleteBox()

Fields

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FilterModeProperty

Gets the identifier for the FilterMode dependency property.

Declaration
public static readonly DependencyProperty FilterModeProperty
Field Value
Type Description
DependencyProperty
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IsDropDownOpenProperty

Identifies the IsDropDownOpen dependency property.

Declaration
public static readonly DependencyProperty IsDropDownOpenProperty
Field Value
Type Description
DependencyProperty

The identifier for the IsDropDownOpen dependency property.
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IsTextCompletionEnabledProperty

Identifies the IsTextCompletionEnabled dependency property.

Declaration
public static readonly DependencyProperty IsTextCompletionEnabledProperty
Field Value
Type Description
DependencyProperty

The identifier for the IsTextCompletionEnabled dependency property.
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ItemContainerStyleProperty

Identifies the ItemContainerStyle dependency property.

Declaration
public static readonly DependencyProperty ItemContainerStyleProperty
Field Value
Type Description
DependencyProperty

The identifier for the ItemContainerStyle dependency property.
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ItemFilterProperty

Identifies the ItemFilter dependency property.

Declaration
public static readonly DependencyProperty ItemFilterProperty
Field Value
Type Description
DependencyProperty

The identifier for the ItemFilter dependency property.
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ItemsSourceProperty

Identifies the ItemsSource dependency property.

Declaration
public static readonly DependencyProperty ItemsSourceProperty
Field Value
Type Description
DependencyProperty

The identifier for the ItemsSource dependency property.
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ItemTemplateProperty

Identifies the ItemTemplate dependency property.

Declaration
public static readonly DependencyProperty ItemTemplateProperty
Field Value
Type Description
DependencyProperty

The identifier for the ItemTemplate dependency property.
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MaxDropDownHeightProperty

Identifies the MaxDropDownHeight dependency property.

Declaration
public static readonly DependencyProperty MaxDropDownHeightProperty
Field Value
Type Description
DependencyProperty

The identifier for the MaxDropDownHeight dependency property.
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MinimumPopulateDelayProperty

Identifies the MinimumPopulateDelay dependency property.

Declaration
public static readonly DependencyProperty MinimumPopulateDelayProperty
Field Value
Type Description
DependencyProperty

The identifier for the MinimumPopulateDelay dependency property.
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MinimumPrefixLengthProperty

Identifies the MinimumPrefixLength dependency property.

Declaration
public static readonly DependencyProperty MinimumPrefixLengthProperty
Field Value
Type Description
DependencyProperty

The identifier for the MinimumPrefixLength dependency property.
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SearchTextProperty

Identifies the SearchText dependency property.

Declaration
public static readonly DependencyProperty SearchTextProperty
Field Value
Type Description
DependencyProperty

The identifier for the SearchText dependency property.
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SelectedItemProperty

Identifies the SelectedItem dependency property.

Declaration
public static readonly DependencyProperty SelectedItemProperty
Field Value
Type Description
DependencyProperty

The identifier the SelectedItem dependency property.
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TextBoxStyleProperty

Identifies the TextBoxStyle dependency property.

Declaration
public static readonly DependencyProperty TextBoxStyleProperty
Field Value
Type Description
DependencyProperty

The identifier for the TextBoxStyle dependency property.
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TextFilterProperty

Identifies the TextFilter dependency property.

Declaration
public static readonly DependencyProperty TextFilterProperty
Field Value
Type Description
DependencyProperty

The identifier for the TextFilter dependency property.
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TextProperty

Identifies the Text dependency property.

Declaration
public static readonly DependencyProperty TextProperty
Field Value
Type Description
DependencyProperty

The identifier for the Text dependency property.

Properties

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FilterMode

Gets or sets how the text in the text box is used to filter items specified by the ItemsSource property for display in the drop-down.

Declaration
public AutoCompleteFilterMode FilterMode { get; set; }
Property Value
Type Description
AutoCompleteFilterMode

One of the AutoCompleteFilterMode values The default is StartsWith.
Remarks

Use the FilterMode property to specify how possible matches are filtered. For example, possible matches can be filtered in a predefined or custom way. The search mode is automatically set to Custom if you set the ItemFilter property.

Exceptions
Type Condition
System.ArgumentException

The specified value is not a valid AutoCompleteFilterMode.
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IsDropDownOpen

Gets or sets a value indicating whether the drop-down portion of the control is open.

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

True if the drop-down is open; otherwise, false. The default is false.
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IsTextCompletionEnabled

Gets or sets a value indicating whether the first possible match found during the filtering process will be displayed automatically in the text box.

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

True if the first possible match found will be displayed automatically in the text box; otherwise, false. The default is false.
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ItemContainerStyle

Gets or sets the Style that is applied to the selection adapter contained in the drop-down portion of the AutoCompleteBox control.

Declaration
public Style ItemContainerStyle { get; set; }
Property Value
Type Description
Style

The Style applied to the selection adapter contained in the drop-down portion of the AutoCompleteBox control. The default is null.
Remarks

The default selection adapter contained in the drop-down is a ListBox control.

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ItemFilter

Gets or sets the custom method that uses user-entered text to filter the items specified by the ItemsSource property for display in the drop-down.

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

The custom method that uses the user-entered text to filter the items specified by the ItemsSource property. The default is null.
Remarks

The filter mode is automatically set to Custom if you set the ItemFilter property.

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ItemsSource

Gets or sets a collection that is used to generate the items for the drop-down portion of the AutoCompleteBox control.

Declaration
public IEnumerable ItemsSource { get; set; }
Property Value
Type Description
System.Collections.IEnumerable

The collection that is used to generate the items of the drop-down portion of the AutoCompleteBox control.
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ItemTemplate

Gets or sets the DataTemplate used to display each item in the drop-down portion of the control.

Declaration
public DataTemplate ItemTemplate { get; set; }
Property Value
Type Description
DataTemplate

The DataTemplate used to display each item in the drop-down. The default is null.
Remarks

You use the ItemTemplate property to specify the visualization of the data objects in the drop-down portion of the AutoCompleteBox control. If your AutoCompleteBox is bound to a collection and you do not provide specific display instructions by using a DataTemplate, the resulting UI of each item is a string representation of each object in the underlying collection.

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MaxDropDownHeight

Gets or sets the maximum height of the drop-down portion of the AutoCompleteBox control.

Declaration
public double MaxDropDownHeight { get; set; }
Property Value
Type Description
System.Double

The maximum height of the drop-down portion of the AutoCompleteBox control. The default is System.Double.PositiveInfinity.
Exceptions
Type Condition
System.ArgumentException

The specified value is less than 0.
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MinimumPopulateDelay

Gets or sets the minimum delay, in milliseconds, after text is typed in the text box before the AutoCompleteBox control populates the list of possible matches in the drop-down.

Declaration
public int MinimumPopulateDelay { get; set; }
Property Value
Type Description
System.Int32

The minimum delay, in milliseconds, after text is typed in the text box, but before the AutoCompleteBox populates the list of possible matches in the drop-down. The default is 0.
Exceptions
Type Condition
System.ArgumentException

The set value is less than 0.
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MinimumPrefixLength

Gets or sets the minimum number of characters required to be entered in the text box before the AutoCompleteBox displays possible matches. matches.

Declaration
public int MinimumPrefixLength { get; set; }
Property Value
Type Description
System.Int32

The minimum number of characters to be entered in the text box before the AutoCompleteBox displays possible matches. The default is 1.
Remarks

If you set MinimumPrefixLength to -1, the AutoCompleteBox will not provide possible matches. There is no maximum value, but setting MinimumPrefixLength to value that is too large will prevent the AutoCompleteBox from providing possible matches as well.

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SearchText

Gets the text that is used to filter items in the ItemsSource item collection.

Declaration
public string SearchText { get; }
Property Value
Type Description
System.String

The text that is used to filter items in the ItemsSource item collection.
Remarks

The SearchText value is typically the same as the Text property, but is set after the TextChanged event occurs and before the Populating event.

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SelectedItem

Gets or sets the selected item in the drop-down.

Declaration
public object SelectedItem { get; set; }
Property Value
Type Description
System.Object

The selected item in the drop-down.
Remarks

If the IsTextCompletionEnabled property is true and text typed by the user matches an item in the ItemsSource collection, which is then displayed in the text box, the SelectedItem property will be a null reference.

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SelectionAdapter

Gets or sets the selection adapter used to populate the drop-down with a list of selectable items.

Declaration
protected ISelectionAdapter SelectionAdapter { get; set; }
Property Value
Type Description
ISelectionAdapter

The selection adapter used to populate the drop-down with a list of selectable items.
Remarks

You can use this property when you create an automation peer to use with AutoCompleteBox or deriving from AutoCompleteBox to create a custom control.

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Text

Gets or sets the text in the text box portion of the AutoCompleteBox control.

Declaration
public string Text { get; set; }
Property Value
Type Description
System.String

The text in the text box portion of the AutoCompleteBox control.
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TextBoxStyle

Gets or sets the Style applied to the text box portion of the AutoCompleteBox control.

Declaration
public Style TextBoxStyle { get; set; }
Property Value
Type Description
Style

The Style applied to the text box portion of the AutoCompleteBox control. The default is null.
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TextFilter

Gets or sets the custom method that uses the user-entered text to filter items specified by the ItemsSource property in a text-based way for display in the drop-down.

Declaration
public AutoCompleteFilterPredicate<string> TextFilter { get; set; }
Property Value
Type Description
AutoCompleteFilterPredicate<System.String>

The custom method that uses the user-entered text to filter items specified by the ItemsSource property in a text-based way for display in the drop-down.
Remarks

The search mode is automatically set to Custom if you set the TextFilter property.

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ValueMemberBinding

Gets or sets the Binding that is used to get the values for display in the text portion of the AutoCompleteBox control.

Declaration
public Binding ValueMemberBinding { get; set; }
Property Value
Type Description
Binding

The Binding object used when binding to a collection property.
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ValueMemberPath

Gets or sets the property path that is used to get values for display in the text portion of the AutoCompleteBox control.

Declaration
public string ValueMemberPath { get; set; }
Property Value
Type Description
System.String

The property path that is used to get values for display in the text portion of the AutoCompleteBox control.

Methods

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ArrangeOverride(Size)

Arranges and sizes the AutoCompleteBox control and its contents.

Declaration
protected override Size ArrangeOverride(Size finalSize)
Parameters
Type Name Description
Size finalSize

The size allowed for the AutoCompleteBox control.
Returns
Type Description
Size

The finalSize, unchanged.
Overrides
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FormatValue(Object)

Converts the specified object to a string by using the Converter and ConverterCulture values of the binding object specified by the ValueMemberBinding property.

Declaration
protected virtual string FormatValue(object value)
Parameters
Type Name Description
System.Object value

The object to format as a string.
Returns
Type Description
System.String

The string representation of the specified object.
Remarks

Override this method to provide a custom string conversion.

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GetSelectionAdapterPart()

Returns the ISelectionAdapter part, if possible.

Declaration
protected virtual ISelectionAdapter GetSelectionAdapterPart()
Returns
Type Description
ISelectionAdapter

A ISelectionAdapter object, if possible. Otherwise, null.
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HasFocus()

Determines whether the text box or drop-down portion of the AutoCompleteBox control has focus.

Declaration
protected bool HasFocus()
Returns
Type Description
System.Boolean

true to indicate the AutoCompleteBox has focus; otherwise, false.
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OnApplyTemplate()

Builds the visual tree for the AutoCompleteBox control when a new template is applied.

Declaration
public override void OnApplyTemplate()
Overrides
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OnCreateAutomationPeer()

Returns a AutoCompleteBoxAutomationPeer for use by the Silverlight automation infrastructure.

Declaration
protected override AutomationPeer OnCreateAutomationPeer()
Returns
Type Description
AutomationPeer

A AutoCompleteBoxAutomationPeer for the AutoCompleteBox object.
Overrides
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OnDropDownClosed(RoutedPropertyChangedEventArgs<Boolean>)

Raises the DropDownClosed event.

Declaration
protected virtual void OnDropDownClosed(RoutedPropertyChangedEventArgs<bool> e)
Parameters
Type Name Description
RoutedPropertyChangedEventArgs<System.Boolean> e

A RoutedPropertyChangedEventArgs<T> which contains the event data.
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OnDropDownClosing(RoutedPropertyChangingEventArgs<Boolean>)

Raises the DropDownClosing event.

Declaration
protected virtual void OnDropDownClosing(RoutedPropertyChangingEventArgs<bool> e)
Parameters
Type Name Description
RoutedPropertyChangingEventArgs<System.Boolean> e

A RoutedPropertyChangingEventArgs<T> that contains the event data.
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OnDropDownOpened(RoutedPropertyChangedEventArgs<Boolean>)

Raises the DropDownOpened event.

Declaration
protected virtual void OnDropDownOpened(RoutedPropertyChangedEventArgs<bool> e)
Parameters
Type Name Description
RoutedPropertyChangedEventArgs<System.Boolean> e

A RoutedPropertyChangedEventArgs<T> that contains the event data.
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OnDropDownOpening(RoutedPropertyChangingEventArgs<Boolean>)

Raises the DropDownOpening event.

Declaration
protected virtual void OnDropDownOpening(RoutedPropertyChangingEventArgs<bool> e)
Parameters
Type Name Description
RoutedPropertyChangingEventArgs<System.Boolean> e

A RoutedPropertyChangingEventArgs<T> that contains the event data.
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OnGotFocus(RoutedEventArgs)

Provides handling for the GotFocus event.

Declaration
protected override void OnGotFocus(RoutedEventArgs e)
Parameters
Type Name Description
RoutedEventArgs e

A RoutedEventArgs that contains the event data.
Overrides
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OnKeyDown(KeyEventArgs)

Provides handling for the KeyDown event.

Declaration
protected override void OnKeyDown(KeyEventArgs e)
Parameters
Type Name Description
KeyEventArgs e

A KeyEventArgs that contains the event data.
Overrides
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OnLostFocus(RoutedEventArgs)

Provides handling for the LostFocus event.

Declaration
protected override void OnLostFocus(RoutedEventArgs e)
Parameters
Type Name Description
RoutedEventArgs e

A RoutedEventArgs that contains the event data.
Overrides
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OnPopulated(PopulatedEventArgs)

Raises the Populated event.

Declaration
protected virtual void OnPopulated(PopulatedEventArgs e)
Parameters
Type Name Description
PopulatedEventArgs e

A PopulatedEventArgs that contains the event data.
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OnPopulating(PopulatingEventArgs)

Raises the Populating event.

Declaration
protected virtual void OnPopulating(PopulatingEventArgs e)
Parameters
Type Name Description
PopulatingEventArgs e

A PopulatingEventArgs that contains the event data.
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OnSelectionChanged(SelectionChangedEventArgs)

Raises the SelectionChanged event.

Declaration
protected virtual void OnSelectionChanged(SelectionChangedEventArgs e)
Parameters
Type Name Description
SelectionChangedEventArgs e

A SelectionChangedEventArgs that contains the event data.
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OnTextChanged(RoutedEventArgs)

Raises the TextChanged event.

Declaration
protected virtual void OnTextChanged(RoutedEventArgs e)
Parameters
Type Name Description
RoutedEventArgs e

A RoutedEventArgs that contains the event data.
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PopulateComplete()

Notifies the AutoCompleteBox that the ItemsSource property has been set and the data can be filtered to provide possible matches in the drop-down.

Declaration
public void PopulateComplete()
Remarks

Call this method when you are providing custom population of the drop-down portion of the AutoCompleteBox, to signal the control that you are done with the population process. Typically, you use PopulateComplete when the population process is a long-running process and you want to cancel built-in filtering of the ItemsSource items. In this case, you can handle the Populated event and set PopulatingEventArgs.Cancel to true. When the long-running process has completed you call PopulateComplete to indicate the drop-down is populated.

Events

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DropDownClosed

Occurs when the IsDropDownOpen property was changed from true to false and the drop-down is open.

Declaration
public event RoutedPropertyChangedEventHandler<bool> DropDownClosed
Event Type
Type Description
RoutedPropertyChangedEventHandler<System.Boolean>
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DropDownClosing

Occurs when the IsDropDownOpen property is changing from true to false.

Declaration
public event RoutedPropertyChangingEventHandler<bool> DropDownClosing
Event Type
Type Description
RoutedPropertyChangingEventHandler<System.Boolean>
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DropDownOpened

Occurs when the value of the IsDropDownOpen property has changed from false to true and the drop-down is open.

Declaration
public event RoutedPropertyChangedEventHandler<bool> DropDownOpened
Event Type
Type Description
RoutedPropertyChangedEventHandler<System.Boolean>
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DropDownOpening

Occurs when the value of the IsDropDownOpen property is changing from false to true.

Declaration
public event RoutedPropertyChangingEventHandler<bool> DropDownOpening
Event Type
Type Description
RoutedPropertyChangingEventHandler<System.Boolean>
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Populated

Occurs when the AutoCompleteBox has populated the drop-down with possible matches based on the Text property.

Declaration
public event PopulatedEventHandler Populated
Event Type
Type Description
PopulatedEventHandler
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Populating

Occurs when the AutoCompleteBox is populating the drop-down with possible matches based on the Text property.

Declaration
public event PopulatingEventHandler Populating
Event Type
Type Description
PopulatingEventHandler
Remarks

If the event is canceled, by setting the PopulatingEventArgs.Cancel property to true, the AutoCompleteBox will not automatically populate the selection adapter contained in the drop-down. In this case, if you want possible matches to appear, you must provide the logic for populating the selection adapter.

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SelectionChanged

Occurs when the selected item in the drop-down portion of the AutoCompleteBox has changed.

Declaration
public event SelectionChangedEventHandler SelectionChanged
Event Type
Type Description
SelectionChangedEventHandler
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TextChanged

Occurs when the text in the text box portion of the AutoCompleteBox changes.

Declaration
public event RoutedEventHandler TextChanged
Event Type
Type Description
RoutedEventHandler

Extension Methods