SelectionChangedEventArgs.ChangeSource Property

Identifies an action that causes selection change.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v25.2.dll

NuGet Package: DevExpress.Blazor

Declaration

public SelectionChangeSource ChangeSource { get; }

Property Value

Type	Description
SelectionChangeSource	An enumeration value.

Available values:

Name	Description
UserAction	Selection changes when a user selects items using mouse/keyboard, or clicks the built-in Select All checkbox (only for ListBox with multiple selection).
ParameterChange	Selection changes when Blazor updates the component’s Value or Values parameter. This happens when you define parameters in component markup or update them using BeginUpdate() and EndUpdate() methods.
ApiCall	For ListBox with multiple selection only: Selection changes when the SelectAllAsync or DeselectAllAsync method is called.

Remarks

Handle the DxComboBox.SelectedDataItemChanged, DxListBox.SelectedDataItemsChanged, or DxTagBox.SelectedDataItemsChanged event to respond to item selection changes. Use the ChangeSource argument property to identify the action that caused the selection change.

ComboBox/TagBox items can be selected/deselected in two ways: UserAction, ParameterChange. ListBox item selection can be changed in three ways: UserAction, ParameterChange, ApiCall.

Refer to DxComboBox.SelectedDataItemChanged, DxListBox.SelectedDataItemsChanged, and DxTagBox.SelectedDataItemsChanged event descriptions for examples.